SIST EN 12926:2008
(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 pour le traitement de l'eau destinée à la consommation humaine - Peroxodisulfate de sodium
La présente Norme européenne s’applique au peroxodisulfate de sodium utilisé pour le traitement de l’eau
destinée à la consommation humaine. Elle décrit les caractéristiques du peroxodisulfate de sodium et spécifie
les exigences et les méthodes d’essai correspondantes. Elle donne des informations pour son emploi dans le
traitement de l’eau.
Kemikalije, ki se uporabljajo za pripravo pitne vode - Natrijev peroksidisulfat
General Information
Relations
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 peroksidisulfatProdukte zur Aufbereitung von Wasser für den menschlichen Gebrauch - NatriumperoxodisulfatProduits chimiques 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 12926:2008SIST EN 12926:2008en,fr,de01-december-2008SIST EN 12926:2008SLOVENSKI
STANDARDSIST EN 12926:20011DGRPHãþD
SIST EN 12926:2008
EUROPEAN STANDARDNORME EUROPÉENNEEUROPÄISCHE NORMEN 12926September 2008ICS 71.100.80Supersedes EN 12926:2000
English VersionChemicals used for treatment of water intended for humanconsumption - Sodium peroxodisulfateProduits chimiques pour le traitement de l'eau destinée à laconsommation humaine - Peroxodisulfate de sodiumProdukte zur Aufbereitung von Wasser für denmenschlichen Gebrauch - NatriumperoxodisulfatThis European Standard was approved by CEN on 30 July 2008.CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this EuropeanStandard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such nationalstandards may be obtained on application to the CEN 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 translationunder the responsibility of a CEN member into its own language and notified to the CEN Management Centre has the same status as theofficial versions.CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland,France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal,Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMITÉ EUROPÉEN DE NORMALISATIONEUROPÄISCHES KOMITEE FÜR NORMUNGManagement Centre: rue de Stassart, 36
B-1050 Brussels© 2008 CENAll rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 12926:2008: ESIST EN 12926:2008
EN 12926:2008 (E) 2 Contents Page Foreword.3 Introduction.4 1 Scope.5 2 Normative references.5 3 Description.5 4 Purity criteria.7 5 Test methods.8 6 Labelling - Transportation - Storage.13 Annex A (informative)
General information on sodium peroxodisulfate.15 Annex B (normative)
General rules relating to safety.16 Annex C (normative)
Determination of arsenic, antimony and selenium (atomic absorption spectrometry hydride technique).17 Bibliography.23
SIST EN 12926:2008
EN 12926:2008 (E) 3 Foreword This document (EN 12926:2008) 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 March 2009, and conflicting national standards shall be withdrawn at the latest by March 2009. 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. This document supersedes EN 12926:2000. Significant technical difference between this edition and EN 12926:2000 is as follows: deletion of reference to EU Directive 80/778/EEC of July 15, 1980 in order to take into account of the latest Directive in force (see [1]). 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, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom.
SIST EN 12926:2008
EN 12926:2008 (E) 4 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 12926:2008
EN 12926:2008 (E) 5 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 referenced documents are indispensable for the application of this European Standard. 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 1483, Water quality – Determination of mercury – Method using atomic absorption spectrometry EN ISO 3696, Water for analytical laboratory use – Specification and test methods (ISO 3696:1987) 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 12926:2008
EN 12926:2008 (E) 6 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.
1) Chemical Abstracts Service Registry Number 2) European Inventory of Existing Commercial Chemical Substances 3) 100 kPa = 1 bar SIST EN 12926:2008
EN 12926:2008 (E) 7 3.3.7 Specific heat Not known. 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: --4---822SO2eOS→+
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. NOTE 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. SIST EN 12926:2008
EN 12926:2008 (E) 8 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]). The content of chemical parameters shall conform to the requirements specified in Table 1. Table 1 — Chemical parameters
Parameter
Limit in mg/kg of Na2S2O8
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 NOTE All measurements should be made with a tolerance of ± 10% unless otherwise stated. 5.2.1 Determination of sodium peroxodisulfate (main product) 5.2.1.1 Principle Determination of peroxodisulfate content by back-titrating a predetermined excess of iron (ll) with potassium permanganate. 5.2.1.2 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. 5.2.1.2.1 Potassium permanganate standard volumetric solution; c(KMnO4 ) = 0,02 mol/l. 5.2.1.2.2 Sulfuric acid (H2SO4), density ρ = 1,84 g/ml. SIST EN 12926:2008
EN 12926:2008 (E) 9 5.2.1.2.3 Phosphoric acid (H3PO4), density ρ =1,68 g/ml. 5.2.1.2.4 Iron (II) sulfate solution;c(FeSO4) =
0,1 mol/l. Dissolve 77 g of iron (II) ammonium sulfate in 500 ml water, add 150 ml of sulfuric acid (5.2.1.2.2) and 50 ml of phosphoric acid (5.2.1.2.3) and make up to 2 000 ml with water. Filter before use. 5.2.1.2.5 Potassium chloride (KCl). 5.2.1.2.6 Potassium chloride; c(KCl) = 3 mol/l. Dissolve 224 g potassium chloride (5.2.1.2.5) in water, add 2 ml of phosphoric acid (5.2.1.2.3) and make up to 1 000 ml with water. 5.2.1.3 Apparatus 5.2.1.3.1 Ordinary laboratory apparatus and glassware.
5.2.1.3.2 Automated potentiometric titration apparatus with program-control of the addition of the solution from the burette. 5.2.1.4 Procedure 5.2.1.4.1 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. 5.2.1.4.2 Determination Introduce the test solution (5.2.1.4.1) in the potentiometric titration apparatus (5.2.1.3.2). Add a predetermined excess of the iron (ll) sulfate solution (5.2.1.2.4) and titrate against the potassium permanganate standard volumetric solution (5.2.1.2.1). Record the volume (V) used. Carry out a blank determination, in duplicate, at the start of the determination and after ten titrations of test solutions. 5.2.1.5 Expression of results The sodium peroxodisulfate content, C1 , expressed as a mass fraction percentage is given by the following equation: ()mcVVC
000 105,119
100
1,0
01xxxxx−=
(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; 0V is the volume in millilitres of the potassium permanganate standard volumetric solution used for the blank determination; SIST EN 12926:2008
EN 12926:2008 (E) 10 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 equation: C2 = C1 x 0,0672.
(2) 5.2.2 Impurities Not applicable. 5.2.3 Chemical parameters 5.2.3.1 Determination of antimony (Sb), arsenic (As), cadmium (Cd), chromium (Cr), lead (Pb), nickel (Ni) and selenium (Se). 5.2.3.1.1 Principle The elements arsenic, antimony, cadmium, chromium, lead, nickel and selenium are determined by atomic absorption spectrometry. 5.2.3.1.2 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. 5.2.3.1.2.1
Nitric acid, concentrated, density ρρρρ = 1,42 g/ml. 5.2.3.1.2.2
Nitric acid, solution c (HNO3) = 2,5 mol/l. 5.2.3.1.2.3
Barium nitrate, Ba (NO3)2. 5.2.3.1.3 Procedure 5.2.3.1.3.1 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. 5.2.3.1.3.2 Test solution For Cd: dissolve the test portion with 40 ml of water and after adding 20 ml of barium nitrate (5.2.3.1.2.3), 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 (5.2.3.1.2.2) to the test portion, dilute with a few millilitres of water and mix. Make up to the mark with water and homogenize. SIST EN 12926:2008
EN 12926:2008 (E) 11 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 (5.2.3.1.2.1) to the test portion, dilute with few millilitres of water and mix. Make up to the mark with water and homogenize. 5.2.3.1.3.3 Determination Determine the content of chemical parameters in the test solution (5.2.3.1.3.2) in accordance with the following methods: 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 equation in 5.2.3.1.4. 5.2.3.1.4 Expression of results From the interim results (y) determined (see 5.2.3.1.3.3), the content, C3, of each chemical parameter in the laboratory sample, expressed in milligrams per kilogram of sodium peroxodisulfate is given by the following equation : 13100yC1m1VC××=
(3) where y is the interim result (5.2.3.1.3.3); V1 is the volume, expressed in millilitres, of the test solution (5.2.3.1.3.2) (= 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 (5.2.1.5). 5.2.3.2 Determination of the mercury content (Hg) 5.2.3.2.1 Principle The element mercury is determined by flameless atomic absorption spectrometry in accordance with EN 1483. 5.2.3.2.2 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. 5.2.3.2.2.1 Potassium permanganate solution, c(KMnO4) = 50 g/l. 5.2.3.2.2.2 Sulfuric acid, concentrated, density ρ = 1,84 g/ml. 5.2.3.2.2.3 Hydroxylammonium chloride solution, c(NH2OH.HCl) = 100 g/l. SIST EN 12926:2008
EN 12926:2008 (E) 12 5.2.3.2.2.4 Potassium dichromate solution, c(K2Cr2O7) = 4 g/l in 50 % by volume nitric acid solution. 5.2.3.2.3 Procedure 5.2.3.2.3.1 Test portion Weigh, to the nearest 0,01 g, 10 g (m2) of the laboratory sample, into a glass beaker. 5.2.3.2.3.2 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 (5.2.3.2.2.1) and five 1 ml portions of sulfuric acid (5.2.3.2.2.2). Bring to the boil and maintain boiling for 10 min. Allow to cool. Dissolve the precipitate (MnO2) with hydroxylammonium chloride (5.2.3.2.2.3), add 5 ml of the potassium dichromate solution (5.2.3.2.2.4) and transfer to a 100 ml volumetric flask. Dilute to the mark with water and mix. 5.2.3.2.3.3 Determination Proceed as described in EN 1483. 5.2.3.2.4 Expression of results The interim result for mercury content (y1) expressed in milligrams per litre is given by the following equation: 10V y
2A1×=y
(4) where yA is the result obtained in 5.2.3.2.3.3, for the concentration of mercury in the test solution, expressed in milligrams per litre; V2 is the volume in millilitres of the test solution. The mercury content, C4, in milligrams per kilogram of sodium peroxodisulfate is given by the following equation: 12214100CxmVxyC=
(5) where : y1 is the previously determined interim result for mercury content; V2 is the volume in millilitres, of the solution A (see 5.2.3.2.3.2); m2 is the mass, expressed in grams, of the test portion (5.2.3.2.3.1); C1 is the sodium peroxodisulfate content in mass fraction percent (5.2.1.5). SIST EN 12926:2008
EN 12926:2008 (E) 13 6 Labelling - Transportation - Storage 6.1 Means of delivery Sodium peroxodisulfate shall be delivered in polyethylene bags or fibre drums with polyethylene linings. In order that the purity of the product is not affected, the means of delivery shall not have been used previously for any different product or it shall have been specially cleaned and prepared before use. 6.2 Risk and safety labelling according to the EU directives 4) The following labelling requirements shall apply to sodium peroxodisulfate at the date of publication of this European Standard. symbols and indications of danger: O : Oxidizing; Xn : Harmful; nature of special risks attributed to
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