SIST EN 12926:2015
(Main)Chemicals used for treatment of water intended for human consumption - Sodium peroxodisulfate
Chemicals used for treatment of water intended for human consumption - Sodium peroxodisulfate
This European Standard is applicable to sodium peroxodisulfate used for treatment of water intended for human consumption. It describes the characteristics of sodium peroxodisulfate and specifies the requirements and the corresponding test methods for sodium peroxodisulfate. It gives information on its use in water treatment.
Produkte zur Aufbereitung von Wasser für den menschlichen Gebrauch - Natriumperoxodisulfat
Diese Europäische Norm gilt für Natriumperoxodisulfat zur Aufbereitung von Wasser für den menschlichen Gebrauch. Sie beschreibt die Eigenschaften von Natriumperoxodisulfat und legt die Anforderungen sowie die entsprechenden Prüfverfahren für Natriumperoxodisulfat fest. Sie enthält Angaben zu dessen Anwendung in der Wasseraufbereitung.
Produits chimiques utilisés pour le traitement de l'eau destinée à la consommation humaine - Peroxodisulfate de sodium
Kemikalije, ki se uporabljajo za pripravo pitne vode - Natrijev peroksodisulfat
General Information
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Standards Content (Sample)
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Kemikalije, ki se uporabljajo za pripravo pitne vode - Natrijev peroksodisulfatProdukte zur Aufbereitung von Wasser für den menschlichen Gebrauch - NatriumperoxodisulfatProduits chimiques utilisés pour le traitement de l'eau destinée à la consommation humaine - Peroxodisulfate de sodiumChemicals used for treatment of water intended for human consumption - Sodium peroxodisulfate71.100.80Chemicals for purification of water13.060.20Pitna vodaDrinking waterICS:Ta slovenski standard je istoveten z:EN 12926:2015SIST EN 12926:2015en,fr,de01-junij-2015SIST EN 12926:2015SLOVENSKI
STANDARDSIST EN 12926:20081DGRPHãþD
SIST EN 12926:2015
EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
EN 12926
March 2015 ICS 71.100.80 Supersedes EN 12926:2008English Version
Chemicals used for treatment of water intended for human consumption - Sodium peroxodisulfate
Produits chimiques pour le traitement de l'eau destinée à la consommation humaine - Peroxodisulfate de sodium
Produkte zur Aufbereitung von Wasser für den menschlichen Gebrauch - Natriumperoxodisulfat This European Standard was approved by CEN on 20 December 2014.
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, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, 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:
Avenue Marnix 17,
B-1000 Brussels © 2015 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 12926:2015 ESIST EN 12926:2015
EN 12926:2015 (E) 2 Contents Page Foreword .4 Introduction .5 1 Scope .6 2 Normative references .6 3 Description .6 3.1 Identification .6 3.1.1 Chemical name .6 3.1.2 Synonym or common name .6 3.1.3 Relative molecular mass .6 3.1.4 Empirical formula.6 3.1.5 Chemical formula .6 3.1.6 CAS Registry Number
..........................................................................................................................7 3.1.7 EINECS reference
.................................................................................................................................7 3.2 Commercial form ...................................................................................................................................7 3.3 Physical properties ................................................................................................................................7 3.3.1 Appearance and odour ..........................................................................................................................7 3.3.2 Density ....................................................................................................................................................7 3.3.3 Solubility in water ..................................................................................................................................7 3.3.4 Vapour pressure ....................................................................................................................................7 3.3.5 Boiling point at 100 kPa
.......................................................................................................................7 3.3.6 Melting point ...........................................................................................................................................7 3.3.7 Specific heat ...........................................................................................................................................7 3.3.8 Viscosity (dynamic) ...............................................................................................................................8 3.3.9 Critical temperature ...............................................................................................................................8 3.3.10 Critical pressure.....................................................................................................................................8 3.3.11 Physical hardness .................................................................................................................................8 3.4 Chemical properties ..............................................................................................................................8 4 Purity criteria ..........................................................................................................................................8 4.1 General ....................................................................................................................................................8 4.2 Composition of commercial product ...................................................................................................8 4.3 Impurities and main by-products .........................................................................................................8 4.4 Chemical parameters ............................................................................................................................8 5 Test methods ..........................................................................................................................................9 5.1 Sampling .................................................................................................................................................9 5.2 Analysis ..................................................................................................................................................9 5.2.1 General ....................................................................................................................................................9 5.2.2 Determination of sodium peroxodisulfate (main product) ................................................................9 5.2.3 Impurities ............................................................................................................................................. 11 5.2.4 Chemical parameters ......................................................................................................................... 11 6 Labelling – Transportation – Storage ............................................................................................... 13 6.1 Means of delivery ................................................................................................................................ 13 6.2 Labelling according to the EU Legislation
...................................................................................... 14 6.3 Transportation regulations and labelling ......................................................................................... 14 6.4 Marking ................................................................................................................................................ 14 6.5 Storage ................................................................................................................................................. 14 6.5.1 General ................................................................................................................................................. 14 6.5.2 Long term stability .............................................................................................................................. 14 6.5.3 Storage incompatibilities ................................................................................................................... 15 SIST EN 12926:2015
EN 12926:2015 (E) 3 Annex A (informative)
General information on sodium peroxodisulfate . 16 A.1 Origin . 16 A.1.1 Raw materials . 16 A.1.2 Manufacturing process . 16 A.2 Use . 16 A.2.1 Function. 16 A.2.2 Form in which it is used . 16 A.2.3 Treatment dose . 16 A.2.4 Means of application . 16 A.2.5 Secondary effects . 16 A.2.6 Removal of excess product . 16 Annex B (normative)
General rules relating to safety . 17 B.1 Rules for safe handling and use . 17 B.2 Emergency procedures . 17 B.2.1 First aid . 17 B.2.2 Spillage . 17 B.2.3 Fire . 17 Annex C (normative)
Determination of arsenic, antimony and selenium (atomic absorption spectrometry hydride technique) . 18 C.1 General principle . 18 C.2 Interferences . 18 C.3 Reagents. 18 C.4 Apparatus . 20 C.5 Procedure . 21 C.5.1 Preparation of the apparatus . 21 C.5.2 Preparation of calibration solutions . 22 C.5.3 Preparation of test solutions and standard solutions . 22 C.5.4 Determination of arsenic with sodium borohydride . 22 C.5.5 Determination of selenium with sodium borohydride . 22 C.5.6 Determination of antimony with sodium borohydride . 23 C.6 Calculation . 23 Bibliography . 24
SIST EN 12926:2015
EN 12926:2015 (E) 4 Foreword This document (EN 12926:2015) 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 September 2015, and conflicting national standards shall be withdrawn at the latest by September 2015. This document supersedes EN 12926:2008. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN [and/or CENELEC] shall not be held responsible for identifying any or all such patent rights. Significant technical difference between this edition and EN 12926:2008 is as follows: a) deletion of reference to EU Directive 67/548/EEC of June 27, 1967 in order to take into account the latest Regulation in force (see [2]); b) 6.2 – updating of risk and safety labelling according to EU Regulation [2] and its latest Adaptations to Technical Progress). According to the CEN-CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. SIST EN 12926:2015
EN 12926:2015 (E) 5 Introduction In respect of potential adverse effects on the quality of water intended for human consumption, caused by the product covered by this European Standard: a) this European Standard 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 European Standard 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. SIST EN 12926:2015
EN 12926:2015 (E) 6 1 Scope This European Standard is applicable to sodium peroxodisulfate used for treatment of water intended for human consumption. It describes the characteristics of sodium peroxodisulfate and specifies the requirements and the corresponding test methods for sodium peroxodisulfate. 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 1233, Water quality - Determination of chromium - Atomic absorption spectrometric methods EN ISO 12846, Water quality - Determination of mercury - Method using atomic absorption spectrometry (AAS) with and without enrichment (ISO 12846) EN ISO 3696, Water for analytical laboratory use - Specification and test methods (ISO 3696) ISO 3165, Sampling of chemical products for industrial use — Safety in sampling ISO 6206, Chemical products for industrial use — Sampling — Vocabulary ISO 8213, Chemical products for industrial use — Sampling techniques — Solid chemical products in the form of particles varying from powders to coarse lumps ISO 8288:1986, Water quality — Determination of cobalt, nickel, copper, zinc, cadmium and lead — Flame atomic absorption spectrometric methods 3 Description 3.1 Identification 3.1.1 Chemical name Sodium peroxodisulfate. 3.1.2 Synonym or common name Sodium persulfate. 3.1.3 Relative molecular mass 238,11. 3.1.4 Empirical formula Na2S2O8. 3.1.5 Chemical formula Na2S2O8. SIST EN 12926:2015
EN 12926:2015 (E) 7 3.1.6 CAS Registry Number 1) 7775-27-1. 3.1.7 EINECS reference 2) 231-892-1. 3.2 Commercial form Sodium peroxodisulfate is available as a crystalline powder. 3.3 Physical properties 3.3.1 Appearance and odour The product is white, odourless, crystalline free-flowing salt. 3.3.2 Density The bulk density of the product is approximately 1,15 g/cm3. 3.3.3 Solubility in water The solubility of the product in water is approximately: − 515 g/l at 10 °C; − 545 g/l at 20 °C; − 605 g/l at 40 °C; − 680 g/l at 60 °C. 3.3.4 Vapour pressure Not applicable. 3.3.5 Boiling point at 100 kPa 3) Not applicable. 3.3.6 Melting point The product decomposes above 65 °C. 3.3.7 Specific heat Not known.
1) Chemical Abstracts Service Registry Number 2) European Inventory of Existing Commercial Chemical Substances 3) 100 kPa = 1 bar. SIST EN 12926:2015
EN 12926:2015 (E) 8 3.3.8 Viscosity (dynamic) Not applicable. 3.3.9 Critical temperature Not applicable. 3.3.10 Critical pressure Not applicable. 3.3.11 Physical hardness Not applicable. 3.4 Chemical properties Sodium peroxodisulfate is a powerful oxidizing agent. Sodium peroxodisulfate also serves as a source of radicals. The standard reduction potential Eo is + 2,06 V at 25 °C for the following reaction: +→2--2-284SO2e2SO 4 Purity criteria 4.1 General This European Standard specifies the minimum purity requirements for sodium peroxodisulfate used for the treatment of water intended for human consumption. Limits are given for impurities commonly present in the product. 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 the product standard. Limits have been given for impurities and chemicals 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 leads to significant quantities of impurities, by-products or additives being present, this shall be notified to the user. 4.2 Composition of commercial product The commercial product shall contain not less than 99 mass fraction percent of Na2S2O8. 4.3 Impurities and main by-products Sodium peroxodisulfate does not contain significant concentrations of impurities or by-products. 4.4 Chemical parameters NOTE For the purpose of this standard, “chemical parameters” are those defined in the EU Directive 98/83/EC of 3 November 1998 (see [1]). SIST EN 12926:2015
EN 12926:2015 (E) 9 The content of chemical parameters shall conform to the requirements specified in Table 1. Table 1 — Chemical parameters
Limit in mg/kg of Na2S2O8 Parameter
Type 1 Type 2 Arsenic (As) max. 0,05
5 Cadmium (Cd) max. 0,05
2 Chromium (Cr) max. 0,5
5 Mercury (Hg) max. 2
2 Nickel (Ni) max. 0,2
5 Lead (Pb) max. 0,05
5 Antimony (Sb) max. 5
10 Selenium (Se) max. 5
10 NOTE Cyanide, which does not exist in a strong oxidizing medium such as sodium peroxodisulfate, is not a relevant chemical parameter. Pesticides and polycyclic aromatic hydrocarbons are not by-products of the manufacturing process. 5 Test methods 5.1 Sampling Observe the recommendations of ISO 3165 and take account of ISO 6206. Prepare the laboratory sample(s) required by the relevant procedure described in ISO 8213. 5.2 Analysis 5.2.1 General All measurements should be made with a tolerance of ± 10 % unless otherwise stated. 5.2.2 Determination of sodium peroxodisulfate (main product) 5.2.2.1 Principle Determination of peroxodisulfate content by back-titrating a predetermined excess of iron(ll) with potassium permanganate. 5.2.2.2 Reagents All reagents shall be of a recognized analytical grade and the water used shall conform to grade 3 in accordance with EN ISO 3696. 5.2.2.2.1 Potassium permanganate standard volumetric solution ; c(KMnO4) = 0,02 mol/l. 5.2.2.2.2 Sulfuric acid (H2SO4), density
= 1,84 g/ml. 5.2.2.2.3 Phosphoric acid (H3PO4), density
= 1,68 g/ml. 5.2.2.2.4 Iron(II) sulfate solution; c(FeSO4) = 0,1 mol/l. SIST EN 12926:2015
EN 12926:2015 (E) 10 Dissolve 77 g of iron (II) ammonium sulfate in 500 ml water, add 150 ml of sulfuric acid (5.2.2.2.2) and 50 ml of phosphoric acid (5.2.2.2.3) and make up to 2 000 ml with water. Filter before use. 5.2.2.2.5 Potassium chloride (KCl). 5.2.2.2.6 Potassium chloride; c(KCl) = 3 mol/l. Dissolve 224 g potassium chloride (5.2.2.2.5) in water, add 2 ml of phosphoric acid (5.2.2.2.3) and make up to 1 000 ml with water. 5.2.2.3 Apparatus Ordinary laboratory apparatus and glassware, together with automated potentiometric titration apparatus with program-control of the addition of the solution from the burette. 5.2.2.4 Procedure 5.2.2.4.1 Preparation of test solution Weigh, to the nearest of 0,1 mg, 0,30 g of sodium peroxodisulfate (m), transfer to a 250 ml glass beaker and dissolve with a small amount of water. 5.2.2.4.2 Determination Introduce the test solution (5.2.2.4.1) for the potentiometric titration in the apparatus (5.2.2.3). Add a predetermined excess of the iron(ll) sulfate solution (5.2.2.2.4) and titrate against the potassium permanganate standard volumetric solution (5.2.2.2.1). Record the volume (V) used. Carry out a blank determination, in duplicate, at the start of the determination and after 10 titrations of test solutions. 5.2.2.5 Expression of results The sodium peroxodisulfate content, C1, expressed as a mass fraction percentage is given by the following formula: ()mcVVC
××××−=000 1119,05100x 0,101 (1) where m is the mass in grams of the test portion; c is the actual concentration expressed in moles per litre of the permanganate standard volumetric solution; V0 is the volume in millilitres of the potassium permanganate standard volumetric solution used for the blank determination; V is the volume in millilitres of the potassium permanganate standard volumetric solution used for the determination; 119,05 is the mass in grams of sodium peroxodisulfate, corresponding to 1,00 ml of potassium permanganate solution c(KMnO4) = 1,00 mol/l. The content of active oxygen, (C2),expressed in mass fraction percent is given by the following formula: C2 = C1 × 0,0672 (2) SIST EN 12926:2015
EN 12926:2015 (E) 11 5.2.3 Impurities Not applicable. 5.2.4 Chemical parameters 5.2.4.1 Determination of antimony (Sb), arsenic (As), cadmium (Cd), chromium (Cr), lead (Pb), nickel (Ni) and selenium (Se). 5.2.4.1.1 Principle The elements arsenic, antimony, cadmium, chromium, lead, nickel and selenium are determined by atomic absorption spectrometry. 5.2.4.1.2 Reagents All reagents shall be of a recognized analytical grade and the water used shall conform to the appropriate grade specified in EN ISO 3696. 5.2.4.1.2.1 Nitric acid, concentrated, density
= 1,42 g/ml. 5.2.4.1.2.2 Nitric acid, solution c (HNO3) = 2,5 mol/l. 5.2.4.1.2.3 Barium nitrate, Ba (NO3)2. 5.2.4.1.3 Procedure 5.2.4.1.3.1 Test portion Weigh, to the nearest 0,01 g: — for Cd, Ni, Pb, As and Sb: 1 g (m1) of the laboratory sample into a 100 ml one-mark volumetric flask; — for Cr: 2 g (m1) of the laboratory sample into a 100 ml one-mark volumetric flask; — for Se: 0,5 g (m1) of the laboratory sample into a 100 ml one-mark volumetric flask. 5.2.4.1.3.2 Test solution For Cd: dissolve the test portion with 40 ml of water and after adding 20 ml of barium nitrate (5.2.4.1.2.3), bring solution briefly to boiling point and after cooling make up to the mark with water. The determination is made with the clear supernatant solution after the barium sulfate has settled out. For Cr and Ni: add 0,5 ml of nitric acid (5.2.4.1.2.2) to the test portion, dilute with a few millilitres of water and mix. Make up to the mark with water and homogenize. For Pb and As: dissolve the test portion with a few millilitres of water and mix. Make up to the mark with water and homogenize. For Se and Sb: add 2 ml of nitric acid (5.2.4.1.2.1) to the test portion, dilute with few millilitres of water and mix. Make up to the mark with water and homogenize. 5.2.4.1.3.3 Determination Determine the content of chemical parameters in the test solution (5.2.4.1.3.2) in accordance with the following methods: SIST EN 12926:2015
EN 12926:2015 (E) 12 — Cd, Ni and Pb: In accordance with ISO 8288:1986, Method A; — Cr: In accordance with EN 1233; — As, Se and Sb: In accordance with the method given in Annex C. These methods will give an interim result (y) expressed in milligrams per litre which needs to be corrected to give the final concentration according to the formula in 5.2.4.1.4. 5.2.4.1.4 Expression of results From the interim results (y) determined (see 5.2.4.1.3.3), the content, C3, of each chemical parameter in the laboratory sample, expressed in milligrams per kilogram of sodium peroxodisulfate is given by the following formula: 1310011CmVyC××=
(3) where y is the interim result (5.2.4.1.3.3); V1 is the volume, expressed in millilitres, of the test solution (5.2.4.1.3.2) (= 100 ml); m1 is the mass, expressed in grams, of the test portion; C1 is the sodium peroxodisulfate content in mass fraction percent of product (5.2.2.5). 5.2.4.2 Determination of the mercury content (Hg) 5.2.4.2.1 Principle The element mercury is determined by flameless atomic absorption spectrometry in accordance with EN ISO 12846. 5.2.4.2.2 Reagents All reagents shall be of a recognized analytical grade and the water used shall conform to the appropriate grade specified in EN ISO 3696. 5.2.4.2.2.1 Potassium permanganate solution, c(KmnO4) = 50 g/l. 5.2.4.2.2.2 Sulfuric acid, concentrated, density
= 1,84 g/ml. 5.2.4.2.2.3 Hydroxylammonium chloride solution, c(NH2OH.HCl) = 100 g/l. 5.2.4.2.2.4 Potassium dichromate solution, c(K2Cr2O7) = 4 g/l in 50 % by volume nitric acid solution. 5.2.4.2.3 Procedure 5.2.4.2.3.1 Test portion Weigh, to the nearest 0,01 g, 10 g (m2) of the laboratory sample, into a glass beaker. SIST EN 12926:2015
EN 12926:2015 (E) 13 5.2.4.2.3.2 Test solution Quantitatively transfer the test portion to a 100 ml (V2) volumetric flask. Dilute with water to the mark and mix (solution A). Pipette, accurately 10 ml of the solution A. Transfer to a 250 ml conical flask and add 60 ml of water, 20 ml of a potassium permanganate solution (5.2.4.2.2.1) and five 1 ml portions of sulfuric acid (5.2.4.2.2.2). Bring to the boil and maintain boiling for 10 min. Allow to cool. Dissolve the precipitate (MnO2) with hydroxylammonium chloride (5.2.4.2.2.3), add 5 ml of the potassium dichromate solution (5.2.4.2.2.4) and transfer to a 100 ml (V3) volumetric flask. Dilute to the mark with water and mix. 5.2.4.2.3.3 Determination Proceed as described in EN ISO 12846. 5.2.4.2.4 Expression of result
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