SIST EN 16370:2022
(Main)Chemicals used for treatment of water intended for human consumption - Sodium chloride for on site electrochlorination using membrane cells
Chemicals used for treatment of water intended for human consumption - Sodium chloride for on site electrochlorination using membrane cells
This European Standard is applicable to sodium chloride intended for on site electrochlorination of water intended for human consumption using membrane cells. It describes the characteristics and specifies the requirements and the corresponding test methods for sodium chloride (see Annex B). It gives information on its use in water treatment.
Produkte zur Aufbereitung von Wasser für den menschlichen Gebrauch - Natriumchlorid zur elektrochemischen Erzeugung von Chlor vor Ort mittels Membranzellen
Dieses Dokument gilt für Natriumchlorid zur elektrochemischen Erzeugung von Chlor vor Ort mittels Membranzellen zur Aufbereitung von Wasser für den menschlichen Gebrauch. Es beschreibt die Eigenschaften und legt die Anforderungen sowie die entsprechenden Prüfverfahren (siehe Anhang B) für Natriumchlorid fest. Es enthält Angaben zur Anwendung des Produktes in der Wasseraufbereitung.
Produits chimiques utilisés pour le traitement de l’eau destinée à la consommation humaine - Chlorure de sodium pour la génération électrochimique de chlore au moyen d’électrolyseurs à membrane
Le présent document s’applique au chlorure de sodium utilisé pour la génération électrochimique de chlore dans l’eau destinée à la consommation humaine au moyen d’électrolyseurs à membrane. Il décrit les caractéristiques du chlorure de sodium et spécifie les exigences et les méthodes d’essai correspondantes (voir l’Annexe B). Il donne des informations sur son emploi dans le traitement de l’eau.
Kemikalije, ki se uporabljajo za pripravo pitne vode - Natrijev klorid za pridobivanje klora po elektrokemijskem postopku z uporabo membranskih celic
Ta evropski standard obravnava natrijev klorid, ki se uporablja za elektrokloriranje vode, namenjene za prehrano ljudi, na mestu uporabe z membranskimi celicami. Opisuje značilnosti natrijevega klorida ter določa zahteve in ustrezne preskusne metode zanj (glej dodatek B). Podaja informacije za njegovo uporabo pri pripravi vode.
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
SIST EN 16370:2022
01-junij-2022
Nadomešča:
SIST EN 16370:2013
Kemikalije, ki se uporabljajo za pripravo pitne vode - Natrijev klorid za pridobivanje
klora po elektrokemijskem postopku z uporabo membranskih celic
Chemicals used for treatment of water intended for human consumption - Sodium
chloride for on site electrochlorination using membrane cells
Produkte zur Aufbereitung von Wasser für den menschlichen Gebrauch - Natriumchlorid
zur elektrochemischen Erzeugung von Chlor vor Ort mittels Membranzellen
Produits chimiques utilisés pour le traitement de l’eau destinée à la consommation
humaine - Chlorure de sodium pour la génération électrochimique de chlore au moyen
d’électrolyseurs à membrane
Ta slovenski standard je istoveten z: EN 16370:2022
ICS:
13.060.20 Pitna voda Drinking water
71.100.80 Kemikalije za čiščenje vode Chemicals for purification of
water
SIST EN 16370:2022 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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SIST EN 16370:2022
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SIST EN 16370:2022
EN 16370
EUROPEAN STANDARD
NORME EUROPÉENNE
April 2022
EUROPÄISCHE NORM
ICS 71.100.80 Supersedes EN 16370:2013
English Version
Chemicals used for treatment of water intended for human
consumption - Sodium chloride for on site
electrochlorination using membrane cells
Produits chimiques utilisés pour le traitement de l'eau Produkte zur Aufbereitung von Wasser für den
destinée à la consommation humaine - Chlorure de menschlichen Gebrauch - Natriumchlorid zur
sodium pour la génération électrochimique de chlore elektrochemischen Erzeugung von Chlor vor Ort
au moyen d'électrolyseurs à membrane mittels Membranzellen
This European Standard was approved by CEN on 13 March 2022.
CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this
European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references
concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN
member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by
translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management
Centre has the same status as the official versions.
CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,
Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and
United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2022 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 16370:2022 E
worldwide for CEN national Members.
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SIST EN 16370:2022
EN 16370:2022 (E)
Contents Page
European foreword . 4
Introduction . 5
1 Scope . 6
2 Normative references . 6
3 Terms and definitions . 7
4 Description . 7
4.1 Identification . 7
4.1.1 Chemical name . 7
4.1.2 Synonym or common name . 7
4.1.3 Relative molecular mass . 7
4.1.4 Empirical formula . 7
4.1.5 Chemical formula . 7
4.1.6 CAS Registry Number . 7
4.1.7 EINECS Reference . 7
4.2 Commercial forms . 7
4.3 Physical properties . 8
4.3.1 Appearance . 8
4.3.2 Density . 8
4.3.3 Solubility (in water) . 8
4.3.4 Vapour pressure . 8
4.3.5 Boiling point at 100 kPa . 8
4.3.6 Melting point . 9
4.3.7 Specific heat . 9
4.3.8 Viscosity (dynamic) . 9
4.3.9 Critical temperature . 9
4.3.10 Critical pressure . 9
4.3.11 Physical hardness . 9
4.4 Chemical properties . 9
5 Purity criteria . 9
5.1 General . 9
5.2 Composition of commercial product . 10
5.3 Impurities and by-products. 10
5.4 Chemical parameters . 10
6 Test methods . 11
6.1 Sampling . 11
6.2 Analyses . 11
6.2.1 Main product . 11
6.2.2 Impurities . 11
6.2.3 Chemical parameters . 15
7 Labelling – Transportation – Storage . 15
7.1 Means of delivery . 15
7.2 Labelling according to the EU legislation . 16
7.3 Transportation regulations and labelling . 16
2
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SIST EN 16370:2022
EN 16370:2022 (E)
7.4 Marking . 16
7.5 Storage . 16
7.5.1 Long term stability . 16
7.5.2 Storage incompatibilities . 16
Annex A (informative) General information on sodium chloride for electrochlorination by
membrane cells . 17
A.1 Origin . 17
A.2 Chemical composition . 17
A.3 Use . 17
A.4 Rules for safe handling and use . 18
A.5 Emergency procedures . 18
Annex B (normative) Analytical methods — Determination of antimony, cadmium,
chromium, iron, lead, manganese, nickel and selenium (inductively coupled plasma
optical emission spectrometry (ICP-OES) . 19
B.1 General . 19
B.2 Principle . 19
B.3 Reagents . 20
B.4 Apparatus . 20
B.5 Procedure . 21
B.6 Expression of results . 23
Bibliography . 28
3
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SIST EN 16370:2022
EN 16370:2022 (E)
European foreword
This document (EN 16370:2022) has been prepared by Technical Committee CEN/TC 164 “Water
supply”, the secretariat of which is held by AFNOR.
This European Standard shall be given the status of a national standard, either by publication of an
identical text or by endorsement, at the latest by October 2022, and conflicting national standards shall
be withdrawn at the latest by October 2022.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN shall not be held responsible for identifying any or all such patent rights.
This document supersedes EN 16370:2013.
In comparison with the previous edition, the following technical modifications have been made:
a) Modification of 7.3 on transportation regulations and labelling, adding the sentence “The user must
be aware of the incompatibilities between transported products.”;
b) Modification of 7.4 on marking. The requirements of marking are also applied to the accompanying
documents;
4-
c) Modification of Table 1 for the quantity of [Fe(CN) ] in commercial product;
6
d) Modification of moisture content in Table 2, to be in line with EN 973 and EN 16401.
Any feedback and questions on this document should be directed to the users’ national standards body.
A complete listing of these bodies can be found on the CEN website.
According to the CEN-CENELEC Internal Regulations, the national standards organisations of the
following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria,
Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland,
Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Republic of
North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the
United Kingdom.
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SIST EN 16370:2022
EN 16370:2022 (E)
Introduction
In respect of potential adverse effects on the quality of water intended for human consumption, caused
by the product covered by this document:
a) this document provides no information as to whether the product may be used without restriction
in any of the Member States of the EU or EFTA;
b) it should be noted that, while awaiting the adoption of verifiable European criteria, existing
national regulations concerning the use and/or the characteristics of this product remain in force.
NOTE 1 Conformity with this document does not confer or imply acceptance or approval of the product in any
of the Member States of the EU or EFTA. The use of the product covered by this document is subject to regulation
or control by National Authorities.
NOTE 2 This product could qualify as a biocide precursor and needs to comply with the relevant legislation in
force. In the European Union, at the time of publication, this legislation is Regulation (EU) No. 528/2012 [3].
5
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SIST EN 16370:2022
EN 16370:2022 (E)
1 Scope
This document is applicable to sodium chloride intended for on-site electrochlorination of water
intended for human consumption using membrane cells. It describes the characteristics and specifies
the requirements and the corresponding test methods for sodium chloride (see Annex B). It gives
information on its use in water treatment.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements of this document. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (including any amendments) applies.
EN 901:2013, Chemicals used for treatment of water intended for human consumption - Sodium
hypochlorite
EN 973:2009, Chemicals used for treatment of water intended for human consumption - Sodium chloride
for regeneration of ion exchangers
EN 14805:2008, Chemicals used for treatment of water intended for human consumption - Sodium
chloride for on site electrochlorination using non-membrane technology
EN ISO 3696, Water for analytical laboratory use - Specification and test methods (ISO 3696)
ISO 2479, Sodium chloride for industrial use — Determination of matter insoluble in water or in acid and
preparation of principal solutions for other determinations
ISO 2480, Sodium chloride for industrial use — Determination of sulphate content — Barium sulphate
gravimetric method
ISO 2482, Sodium chloride for industrial use — Determination of calcium and magnesium contents —
EDTA complexometric methods
ISO 2483, Sodium chloride for industrial use — Determination of the loss of mass at 110 degrees C
ISO 3165, Sampling of chemical products for industrial use — Safety in sampling
ISO 6206, Chemical products for industrial use — Sampling — Vocabulary
ISO 6227, Chemical products for industrial use — General method for determination of chloride ions —
Potentiometric method
ISO 8213, Chemical products for industrial use — Sampling techniques — Solid chemical products in the
form of particles varying from powders to coarse lumps
6
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EN 16370:2022 (E)
3 Terms and definitions
No terms and definitions are listed in this document.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— IEC Electropedia: available at https://www.electropedia.org/
— ISO Online browsing platform: available at https://www.iso.org/obp
4 Description
4.1 Identification
4.1.1 Chemical name
Sodium chloride.
4.1.2 Synonym or common name
Salt.
4.1.3 Relative molecular mass
58,45.
4.1.4 Empirical formula
NaCl.
4.1.5 Chemical formula
NaCl.
1
4.1.6 CAS Registry Number
7647-14-5.
2
4.1.7 EINECS Reference
231-598-3.
4.2 Commercial forms
The product is available as rock salt, sea salt or evaporated salt, and it is supplied as free-flowing
crystals or their compacted forms.
1
Chemical Abstract Service Registry Number.
2
European Inventory of Existing Commercial Chemical Substances.
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EN 16370:2022 (E)
4.3 Physical properties
4.3.1 Appearance
The product is white and crystalline.
4.3.2 Density
3
The density of the solid crystal is 2,16 g/cm at 20 °C.
The bulk density depends on the particle size distribution.
4.3.3 Solubility (in water)
The solubility of the product depends on the temperature as given in Figure 1.
Temperature NaCl solution
°C Mass fraction in
g/100 g
- 10 25,00
0 26,34
10 26,35
20 26,43
30 26,56
40 26,71
50 26,89
60 27,09
70 27,30
80 27,53
90 27,80
100 28,12
Key
1 Transition point NaCl → NaCl · 2 H O
2
Figure 1 — Solubility curve for sodium chloride in water
4.3.4 Vapour pressure
Not applicable.
3
4.3.5 Boiling point at 100 kPa
Not applicable.
3
100 kPa = 1 bar.
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SIST EN 16370:2022
EN 16370:2022 (E)
4.3.6 Melting point
802 °C.
4.3.7 Specific heat
Approximately 850 J/(kg · K) at 25 °C for the solid.
4.3.8 Viscosity (dynamic)
The viscosity of the saturated solution at 20 °C is approximately 1,9 mPa · s.
4.3.9 Critical temperature
Not applicable.
4.3.10 Critical pressure
Not applicable.
4.3.11 Physical hardness
The hardness of solid salt is given as 2 to 2,5 on the Mohs' scale of hardness.
4.4 Chemical properties
Sodium chloride is stable, non-volatile and aqueous solutions have good electrical conductivity.
Sodium chloride reacts with a number of acids (e.g. sulfuric acid, phosphoric acid) and strong oxidising
agents. The reactions are often complex and require heat for completion.
NOTE Under certain conditions, a sodium chloride solution can cause corrosion of metallic surfaces.
5 Purity criteria
5.1 General
This document specifies the minimum purity requirements for sodium chloride for on-site
electrochlorination of water intended for human consumption using membrane cells. The basic quality
of the applied salt shall meet the requirements of Codex Alimentarius for Food Grade Salt, because all
components of the electrolysed salt are added to drinking water. As the treatment chemical produced
by this process is chlorine or sodium hypochlorite, limits have also been calculated from the
requirements of EN 901:2013 and of EN 973:2009 under consideration of the demand of minimization
for those impurities commonly present in the product and the chemical parameters. Depending on the
raw material and the manufacturing process other impurities may be present and, if so, this shall be
notified to the user and when necessary to relevant authorities.
Users of this product should check the national regulations in order to clarify whether it is of
appropriate purity for treatment of water intended for human consumption, taking into account raw
water quality, required dosage, contents of other impurities and additives used in the product not
stated in this product standard.
Limits have been given for impurities and chemical parameters where these are likely to be present in
significant quantities from the current production process and raw materials. If the production process
or raw materials lead to significant quantities of impurities, by-products or additives being present, this
shall be notified to the user.
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SIST EN 16370:2022
EN 16370:2022 (E)
5.2 Composition of commercial product
The composition of the commercial product shall conform to Table 1.
Table 1 — Composition/Additives
Composition Mass fraction of dry product
NaCl ≥ 99,9 %
4- a
< 3,5 mg/kg
[Fe(CN) ]
6
a 4-
Analytical method of [Fe(CN) ] : see EN 973:2009, B.3.
6
5.3 Impurities and by-products
The product shall conform to the requirements specified in Table 2.
Table 2 — Impurities and by-products
Impurity/by- Limit in mass fraction of NaCl content
product
mg/kg
Grade 1 Grade 2
Moisture, dry product ≤ 6 000 ≤ 6 000
a
Moisture, wet product ≤ 50 000
≤ 50 000
Water-insoluble
≤ 500 ≤ 1000
matter
Bromide ≤ 50 ≤ 250
Iron ≤ 2 ≤ 2
Manganese ≤ 0,5 ≤ 1
Calcium + magnesium ≤ 25 ≤ 300
Sulfate ≤ 400 ≤ 600
a
The flowability of the products is reduced by a high moisture content; further information is
available from the supplier of the product.
The grade should be selected based on the requirements of the electrochlorination equipment
depending on the susceptibility of the membrane to fouling. The electrochlorination equipment
manufacturers will specify which grade can be used to meet the requirements of the Drinking Water
Directive or national regulations.
5.4 Chemical parameters
The products shall conform to the requirements specified in Table 3.
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EN 16370:2022 (E)
Table 3 — Chemical parameters
Parameter Limits in mg/kg of
commercial product
Arsenic (As) ≤ 0,3
Cadmium (Cd) ≤ 0,5
Chromium (Cr) ≤ 0,5
Mercury (Hg) ≤ 0,1
Nickel (Ni) ≤ 0,5
Lead (Pb) ≤ 2
Antimony (Sb) ≤ 2
Selenium (Se) ≤ 2
NOTE 1 The limits result from requirements of Codex Alimentarius
(C.A.) for Food Grade Salt and EN 901:2013 and EN 973:2009 with
respect to the demand of minimization.
NOTE 2 Other chemical parameters and indicator parameters as
listed in EU Directive 98/83/EC (see [1]) are not relevant in sodium
chloride.
6 Test methods
6.1 Sampling
A test sample of about 500 g shall be taken for analysis, ensuring that it is representative of the whole
batch, and taking account of ISO 3165 and ISO 6206. Prepare the laboratory sample(s) required in
accordance with ISO 8213.
6.2 Analyses
6.2.1 Main product
The mass fraction in % of sodium chloride (NaCI) shall be determined by calculation, on the basis of the
results of the determinations of sulfate (according to ISO 2480), halogens (according to ISO 6227),
calcium and magnesium (according to ISO 2482), and loss of mass on drying (according to ISO 2483).
Convert sulfate to calcium sulfate and unused calcium to calcium chloride, unless sulfate in sample
exceeds the amount necessary to combine with calcium, in which case convert calcium to calcium
sulfate and unused sulfate to first to magnesium sulfate and the remaining sulfate to sodium sulfate.
Convert unused magnesium to magnesium chloride. Convert unused halogens to sodium chloride.
Report the sodium chloride contents on a dry matter basis, multiplying the mass fraction in % of
sodium chloride by 100/(100 - P), where P in the percentage of the loss of mass on drying (see 6.2.2.2).
6.2.2 Impurities
6.2.2.1 Water-insoluble matter
The content of water-insoluble matter shall be determined in accordance with ISO 2479.
11
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6.2.2.2 Moisture content
The loss of mass at 110 °C shall be determined in accordance with ISO 2483.
6.2.2.3 Bromide
6.2.2.3.1 General
The present method describes a titrimetric method with sodium thiosulfate for the determination of
total bromine and iodine in sodium chloride. The method is applicable to products of bromine and
-
iodine content (expressed conventionally as bromide, Br ) equal to or greater than 3 mg bromine per
kilogram of salt. Bromine or bromide are equivalent for the expression of the results.
6.2.2.3.2 Principle
The sample is dissolved in water. Oxidation of iodide to iodate and bromide to bromate is achieved with
hypochlorite in a buffered medium and the excess of oxidant is eliminated with formic acid. Free iodine,
equivalent to the amount of the present iodate and bromate, is formed by addition of hydrochloric acid
and potassium iodide. The free iodine is titrated with sodium thiosulfate using starch as indicator.
6.2.2.3.3 Reactions
−
- - -
I + 3 ClO → IO + 3 Cl (1)
3
−
- - -
Br + 3 ClO → BrO + 3 Cl (2)
3
Titration of the iodate and bromate follows the reactions:
−
- + -
IO + 6 I + 6 H → 3 I + I + 3 H O (3)
3 2 2
−
- + -
BrO + 6 I + 6 H → 3 I + Br + 3 H O (4)
2 2
3
NOTE Reactions (1) and (2) require for completion the presence of chloride ions that are added into the
buffer solution.
6.2.2.3.4 Reagents
Unless otherwise stated, use only reagents of recognized analytical grade and only water conforming to
grade 3 in accordance with EN ISO 3696.
6.2.2.3.4.1 Calcium carbonate, precipitated.
6.2.2.3.4.2 Hydrochloric acid, c(HCl) approximately 4 mol/l.
6.2.2.3.4.3 Formic acid, c(HCOOH) approximately 3 mol/l.
6.2.2.3.4.4 Potassium iodide, ρ(KI) approximately 100 g/l.
Prepare this solution on the day of use and store it in a dark bottle.
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EN 16370:2022 (E)
6.2.2.3.4.5 Sodium hypochlorite, ρ(NaClO) approximately 19 g/l.
Prepare this solution by dilution of a concentrated technical sodium hypochlorite solution. Renew the
solution each week.
Commercial household solutions which can contain interfering additives should not be used.
6.2.2.3.4.6 Buffer solution
Dissolve 50 g of sodium dihydrogen orthophosphate dihydrate, (NaH PO ·2 H O), 50 g of disodium
2 4 2
hydrogen orthophosphate dodecahydrate (Na HPO ·12 H O), 50 g of tetrasodium pyrophosphate
2 4 2
decahydrate (Na P O ·10 H O) and 150 g of sodium chloride (see NOTE) in 650 ml of water.
4 2 7 2
NOTE As the same quantity of buffer solution is used for the sample and for the blank test solution, it is not
necessary to use products completely free of iodine and bromine.
6.2.2.3.4.7 Sodium thiosulfate, standard volumetric solution, c(Na S O ) = 0,01 mol/l.
2 2 3
Prepare this solution by dilution of a standard volumetric solution c(Na S O ) = 0
...
SLOVENSKI STANDARD
oSIST prEN 16370:2020
01-julij-2020
Kemikalije, ki se uporabljajo za pripravo pitne vode - Natrijev klorid za
elektrokemično kloriranje na kraju samem z uporabo membranskih celic
Chemicals used for treatment of water intended for human consumption - Sodium
chloride for on site electrochlorination using membrane cells
Produkte zur Aufbereitung von Wasser für den menschlichen Gebrauch - Natriumchlorid
zur elektrochemischen Erzeugung von Chlor vor Ort mittels Membranzellen
Produits chimiques utilisés pour le traitement de leau destinée à la consommation
humaine - Chlorure de sodium pour la génération électrochimique de chlore au moyen
délectrolyseurs à membrane
Ta slovenski standard je istoveten z: prEN 16370
ICS:
13.060.20 Pitna voda Drinking water
71.100.80 Kemikalije za čiščenje vode Chemicals for purification of
water
oSIST prEN 16370:2020 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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oSIST prEN 16370:2020
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oSIST prEN 16370:2020
DRAFT
EUROPEAN STANDARD
prEN 16370
NORME EUROPÉENNE
EUROPÄISCHE NORM
May 2020
ICS 71.100.80 Will supersede EN 16370:2013
English Version
Chemicals used for treatment of water intended for human
consumption - Sodium chloride for on site
electrochlorination using membrane cells
Produits chimiques utilisés pour le traitement de l¿eau Produkte zur Aufbereitung von Wasser für den
destinée à la consommation humaine - Chlorure de menschlichen Gebrauch - Natriumchlorid zur
sodium pour la génération électrochimique de chlore elektrochemischen Erzeugung von Chlor vor Ort
au moyen d¿électrolyseurs à membrane mittels Membranzellen
This draft European Standard is submitted to CEN members for enquiry. It has been drawn up by the Technical Committee
CEN/TC 164.
If this draft becomes a European Standard, CEN members are bound to comply with the CEN/CENELEC Internal Regulations
which stipulate the conditions for giving this European Standard the status of a national standard without any alteration.
This draft European Standard was established by CEN in three official versions (English, French, German). A version in any other
language made by translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC
Management Centre has the same status as the official versions.
CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,
Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and
United Kingdom.
Recipients of this draft are invited to submit, with their comments, notification of any relevant patent rights of which they are
aware and to provide supporting documentation.
Warning : This document is not a European Standard. It is distributed for review and comments. It is subject to change without
notice and shall not be referred to as a European Standard.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2020 CEN All rights of exploitation in any form and by any means reserved Ref. No. prEN 16370:2020 E
worldwide for CEN national Members.
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oSIST prEN 16370:2020
prEN 16370:2020 (E)
Contents Page
European foreword . 5
Introduction . 6
1 Scope . 7
2 Normative references . 7
3 Terms and definitions . 8
4 Description . 8
4.1 Identification . 8
4.1.1 Chemical name . 8
4.1.2 Synonym or common name . 8
4.1.3 Relative molecular mass . 8
4.1.4 Empirical formula . 8
4.1.5 Chemical formula . 8
4.1.6 CAS Registry Number . 8
4.1.7 EINECS Reference . 8
4.2 Commercial forms . 8
4.3 Physical properties . 9
4.3.1 Appearance . 9
4.3.2 Density . 9
4.3.3 Solubility (in water) . 9
4.3.4 Vapour pressure . 9
4.3.5 Boiling point at 100 kPa . 9
4.3.6 Melting point . 9
4.3.7 Specific heat . 10
4.3.8 Viscosity (dynamic) . 10
4.3.9 Critical temperature . 10
4.3.10 Critical pressure . 10
4.3.11 Physical hardness . 10
4.4 Chemical properties . 10
5 Purity criteria . 10
5.1 General . 10
5.2 Composition of commercial product . 10
5.3 Impurities and by-products. 11
5.4 Chemical parameters . 11
6 Test methods . 12
6.1 Sampling . 12
6.2 Analyses . 12
6.2.1 Main product . 12
6.2.2 Impurities . 12
6.2.3 Chemical parameters . 16
7 Labelling – Transportation – Storage . 16
7.1 Means of delivery . 16
)
7.2 Labelling according to the EU legislation . 16
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7.3 Transportation regulations and labelling . 17
7.4 Marking . 17
7.5 Storage . 17
7.5.1 Long term stability . 17
7.5.2 Storage incompatibilities . 17
Annex A (informative) General information on sodium chloride for electrochlorination by
membrane cells . 18
A.1 Origin . 18
A.2 Chemical composition . 18
A.3 Use . 18
A.3.1 Function . 18
A.3.2 Form in which the product is used . 19
A.3.3 Consumption of salt for electrochlorination . 19
A.3.4 Means of application . 19
A.3.5 Secondary effects . 19
A.3.6 Removal of excess product . 19
A.4 Rules for safe handling and use . 19
A.5 Emergency procedures . 19
A.5.1 First aid . 19
A.5.2 Spillage . 19
A.5.3 Fire . 19
Annex B (normative) Analytical methods — Determination of antimony, cadmium,
chromium, iron, lead, manganese, nickel and selenium (inductively coupled plasma
optical emission spectrometry (ICP-OES) . 20
B.1 General . 20
B.2 Principle . 20
B.3 Reagents . 20
B.3.1 Nitric acid, ρ approximately 1,40 g/ml, mass fraction of 65 % solution . 21
B.3.2 Sodium chloride solution, β = 250 g/l . 21
B.3.3 Scandium (reference element) solution, β(Sc) = 50 mg/l . 21
B.3.4 Element, stock solution, β (each element) = 1 000 mg/l certified commercial solutions . 21
B.3.5 Argon, pressure not less than 700 kPa. The argon used can be compressed or liquefied gas . 21
B.4 Apparatus . 21
B.4.1 Spectrometer ICP-OES . 21
B.5 Procedure . 22
B.5.1 Test portion . 22
B.5.2 Test solution . 22
B.5.3 Calibration and verification solutions . 22
B.5.4 Determination. 23
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B.5.4.1 Setting of the apparatus . 23
B.5.4.2 Spectrometric measurements . 23
B.6 Expression of results . 24
B.6.1 Evaluation . 24
B.6.2 Calculation . 24
B.6.3 Repeatability and reproducibility. 24
B.6.4 Limit of quantification (LOQ) . 27
Bibliography . 29
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European foreword
This document (prEN 16370:2020) has been prepared by Technical Committee CEN/TC 164 “Water
supply”, the secretariat of which is held by AFNOR.
This document is currently submitted to the CEN Enquiry.
This document will supersede EN 16370:2013.
In comparison with the previous edition, the following technical modifications have been made:
a) Modification of 6.3 on transportation regulations and labelling, adding the sentence “The user must
be aware of the incompatibilities between transported products.”;
b) Modification of 6.4 on marking. The requirements of marking are also applied to the accompanying
documents;
4-
c) Modification of Table 1 for the quantity of [Fe(CN) ] in commercial product;
6
d) Modification of moisture content in Table 2, to be in line with EN 973 and EN 16401.
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Introduction
In respect of potential adverse effects on the quality of water intended for human consumption, caused
by the product covered by this document:
a) this document provides no information as to whether the product may be used without restriction
in any of the Member States of the EU or EFTA;
b) it should be noted that, while awaiting the adoption of verifiable European criteria, existing
national regulations concerning the use and/or the characteristics of this product remain in force.
NOTE Conformity with this document does not confer or imply acceptance or approval of the product in any
of the Member States of the EU or EFTA. The use of the product covered by this European Standard is subject to
regulation or control by National Authorities.
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1 Scope
This document is applicable to sodium chloride intended for on-site electrochlorination of water
intended for human consumption using membrane cells. It describes the characteristics and specifies
the requirements and the corresponding test methods for sodium chloride (see Annex B). It gives
information on its use in water treatment.
2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and are
indispensable for its application. For dated references, only the edition cited applies. For undated
references, the latest edition of the referenced document (including any amendments) applies.
EN 901:2013, Chemicals used for treatment of water intended for human consumption - Sodium
hypochlorite
EN 973:2009, Chemicals used for treatment of water intended for human consumption - Sodium chloride
for regeneration of ion exchangers
EN 14805:2008, Chemicals used for treatment of water intended for human consumption - Sodium
chloride for on site electrochlorination using non-membrane technology
EN ISO 3696, Water for analytical laboratory use - Specification and test methods (ISO 3696:1987)
ISO 2479, Sodium chloride for industrial use — Determination of matter insoluble in water or in acid and
preparation of principal solutions for other determinations
ISO 2480, Sodium chloride for industrial use — Determination of sulphate content — Barium sulphate
gravimetric method
ISO 2482, Sodium chloride for industrial use — Determination of calcium and magnesium contents —
EDTA complexometric methods
ISO 2483, Sodium chloride for industrial use — Determination of the loss of mass at 110 degrees C
ISO 3165, Sampling of chemical products for industrial use — Safety in sampling
ISO 6206, Chemical products for industrial use — Sampling — Vocabulary
ISO 6227, Chemical products for industrial use — General method for determination of chloride ions —
Potentiometric method
ISO 8213, Chemical products for industrial use — Sampling techniques — Solid chemical products in the
form of particles varying from powders to coarse lumps
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3 Terms and definitions
No terms and definitions are listed in this document.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
• IEC Electropedia: available at http://www.electropedia.org/
• ISO Online browsing platform: available at http://www.iso.org/obp
4 Description
4.1 Identification
4.1.1 Chemical name
Sodium chloride.
4.1.2 Synonym or common name
Salt.
4.1.3 Relative molecular mass
58,45.
4.1.4 Empirical formula
NaCl.
4.1.5 Chemical formula
NaCl.
1)
4.1.6 CAS Registry Number
7647-14-5.
2)
4.1.7 EINECS Reference
231-598-3.
4.2 Commercial forms
The product is available as rock salt, sea salt or evaporated salt, and it is supplied as free-flowing
crystals or their compacted forms.
1)
Chemical Abstract Service Registry Number.
2)
European Inventory of Existing Commercial Chemical Substances.
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4.3 Physical properties
4.3.1 Appearance
The product is white and crystalline.
4.3.2 Density
3
The density of the solid crystal is 2,16 g/cm at 20 °C.
The bulk density depends on the particle size distribution.
4.3.3 Solubility (in water)
The solubility of the product depends on the temperature as given in Figure 1.
Temperature NaCl solution
°C Mass fraction in
g/100 g
- 10 25,00
0 26,34
10 26,35
20 26,43
30 26,56
40 26,71
50 26,89
60 27,09
Key
70 27,30
1 Transition point NaCl → NaCl · 2 H O
2
80 27,53
90 27,80
100 28,12
Figure 1 — Solubility curve for sodium chloride in water
4.3.4 Vapour pressure
Not applicable.
3)
4.3.5 Boiling point at 100 kPa
Not applicable.
4.3.6 Melting point
802 °C.
3)
100 kPa = 1 bar.
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4.3.7 Specific heat
Approximately 850 J/(kg · K) at 25 °C for the solid.
4.3.8 Viscosity (dynamic)
The viscosity of the saturated solution at 20 °C is approximately 1,9 mPa · s.
4.3.9 Critical temperature
Not applicable.
4.3.10 Critical pressure
Not applicable.
4.3.11 Physical hardness
The hardness of solid salt is given as 2 to 2,5 on the Mohs' scale of hardness.
4.4 Chemical properties
Sodium chloride is stable, non-volatile and aqueous solutions have good electrical conductivity.
Sodium chloride reacts with a number of acids (e.g. sulfuric acid, phosphoric acid) and strong oxidising
agents. The reactions are often complex and require heat for completion.
NOTE Under certain conditions, a sodium chloride solution can cause corrosion of metallic surfaces.
5 Purity criteria
5.1 General
This European Standard specifies the minimum purity requirements for sodium chloride for on site
electrochlorination of water intended for human consumption using membrane cells. The basic quality
of the applied salt shall meet the requirements of Codex Alimentarius for Food Grade Salt, because all
components of the electrolysed salt are added to drinking water. As the treatment chemical produced
by this process is chlorine or sodium hypochlorite, limits have also been calculated from the
requirements of EN 901 and of EN 973 under consideration of the demand of minimization for those
impurities commonly present in the product and the chemical parameters. Depending on the raw
material and the manufacturing process other impurities may be present and, if so, this shall be notified
to the user and when necessary to relevant authorities.
Users of this product should check the national regulations in order to clarify whether it is of
appropriate purity for treatment of water intended for human consumption, taking into account raw
water quality, required dosage, contents of other impurities and additives used in the product not
stated in this product standard.
Limits have been given for impurities and chemical parameters where these are likely to be present in
significant quantities from the current production process and raw materials. If the production process
or raw materials lead to significant quantities of impurities, by-products or additives being present, this
shall be notified to the user.
5.2 Composition of commercial product
The composition of the commercial product shall conform to Table 1.
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Table 1 — Composition/Additives
Composition Mass fraction of dry
product
NaCl ≥ 99,9 %
4- a) < 10 ppm
[Fe(CN) ]
6
4-
a)
Analytical method of [Fe(CN) ] : see
6
EN 973:2009, B.3.
5.3 Impurities and by-products
The product shall conform to the requirements specified in Table 2.
Table 2 — Impurities and by-products
Impurity/by- Limit in mass fraction of NaCl content (mg/kg)
product
Grade 1 Grade 2
Moisture, dry product ≤ 6 000 ≤ 6 000
Moisture, wet product a
≤ 50 000
≤ 50 000
Water-insoluble
≤ 500 ≤ 1000
matter
Bromide ≤ 50 ≤ 250
Iron ≤ 2 ≤ 2
Manganese ≤ 0,5 ≤ 1
Calcium + magnesium ≤ 25 ≤ 300
Sulfate ≤ 400 ≤ 600
a
The flowability of the products is reduced by a high moisture content; further information is
available from the supplier of the product.
The grade should be selected based on the requirements of the electrochlorination equipment
depending on the susceptibility of the membrane to fouling. The electrochlorination equipment
manufacturers will specify which grade can be used to meet the requirements of the Drinking Water
Directive or national regulations.
5.4 Chemical parameters
The products shall conform to the requirements specified in Table 3.
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Table 3 — Chemical parameters
Parameter Limits in mg/kg of
commercial product
Arsenic (As) ≤ 0,3
Cadmium (Cd) ≤ 0,5
Chromium (Cr) ≤ 0,5
Mercury (Hg) ≤ 0,1
Nickel (Ni) ≤ 0,5
Lead (Pb) ≤ 2
Antimony (Sb) ≤ 2
Selenium (Se) ≤ 2
NOTE 1 The limits result from requirements of Codex
Alimentarius (C.A.) for Food Grade Salt and EN 901 and EN 973 with
respect to the demand of minimization.
NOTE 2 Other chemical parameters and indicator parameters as
listed in EU Directive 98/83/EC (see [1]) are not relevant in sodium
chloride.
6 Test methods
6.1 Sampling
A test sample of about 500 g shall be taken for analysis, ensuring that it is representative of the whole
batch, and taking account of ISO 3165 and ISO 6206. Prepare the laboratory sample(s) required in
accordance with ISO 8213.
6.2 Analyses
6.2.1 Main product
The mass fraction in % of sodium chloride (NaCI) shall be determined by calculation, on the basis of the
results of the determinations of sulfate (according to ISO 2480), halogens (according to ISO 6227),
calcium and magnesium (according to ISO 2482), and loss of mass on drying (according to ISO 2483).
Convert sulfate to calcium sulfate and unused calcium to calcium chloride, unless sulfate in sample
exceeds the amount necessary to combine with calcium, in which case convert calcium to calcium
sulfate and unused sulfate to first to magnesium sulfate and the remaining sulfate to sodium sulfate.
Convert unused magnesium to magnesium chloride. Convert unused halogens to sodium chloride.
Report the sodium chloride contents on a dry matter basis, multiplying the mass fraction in % of
sodium chloride by 100/(100 - P), where P in the percentage of the loss of mass on drying (see 5.2.2.2).
6.2.2 Impurities
6.2.2.1 Water-insoluble matter
The content of water-insoluble matter
...
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