SIST EN 12926:2015

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

• Status: Published
• Public Enquiry End Date: 29-Sep-2014
• Publication Date: 10-May-2015
• ICS: 13.060.20 - Drinking water
• ICS: 71.100.80 - Chemicals for purification of water
• Technical Committee: IOVO - Water supply and waste water engineering
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 18-Mar-2015
• Due Date: 23-May-2015
• Completion Date: 11-May-2015
• Directive: TP262 - Uredba o pitni vodi
• Ref Project: EN 12926:2015 - Chemicals used for treatment of water intended for human consumption - Sodium peroxodisulfate

Relations

• Replaces: SIST EN 12926:2008 - Chemicals used for treatment of water intended for human consumption - Sodium peroxodisulfate
• Effective Date: 01-Jun-2015

Overview

EN 12926:2015 is the CEN (European) standard that specifies requirements for sodium peroxodisulfate (also known as sodium persulfate) when used for the treatment of water intended for human consumption. The standard describes identification, physical and chemical properties, purity criteria, sampling and test methods, labelling, transportation and storage requirements, and includes informative and normative annexes that provide practical and safety information.

Key identification data in the standard:

• Chemical name: Sodium peroxodisulfate
• Synonym: Sodium persulfate
• Empirical formula: Na2S2O8
• Relative molecular mass: 238.11
• CAS No.: 7775-27-1
• EINECS: 231-892-1

Key topics and technical requirements

• Description and properties: Appearance (white, odourless crystalline powder), bulk density (~1.15 g/cm3), solubility in water at various temperatures, and decomposition above ~65 °C.
• Purity criteria and composition: Defines composition of commercial products and acceptable impurities/main by-products.
• Test methods and sampling: Specifies sampling rules and analytical methods for the main product, impurities and chemical parameters. Annex C gives a detailed method for determination of arsenic, antimony and selenium using hydride atomic absorption spectrometry. Sampling guidance references relevant ISO methods.
• Labelling and regulatory compliance: Updated labelling requirements in line with current EU chemical regulations and guidance for transport labelling.
• Storage and safety: Requirements for safe handling, storage conditions, incompatibilities and emergency procedures (first aid, spillage, fire measures) are provided in normative annexes.
• Documentation and conformity: Notes that conformity with the standard does not replace national regulatory approval for use in drinking water systems.

Applications and who uses this standard

This standard is aimed at stakeholders involved in safe and compliant use of sodium peroxodisulfate for drinking water treatment:

• Water utilities and drinking water system operators choosing or specifying chemicals for water treatment
• Chemical manufacturers and suppliers producing sodium peroxodisulfate for potable water use
• Analytical laboratories performing conformity testing and impurity analysis
• Regulatory bodies and procurement specialists verifying product compliance with European norms
• Health & safety officers implementing storage, transport and emergency procedures

Related standards

Normative references cited in EN 12926 include (but are not limited to):

• EN 1233 (Cr determination by AAS)
• EN ISO 12846 (Mercury by AAS)
• EN ISO 3696 (Water for analytical use)
• ISO 3165, ISO 6206, ISO 8213 (sampling standards)
• ISO 8288 (AAS for metals)

For procurement, compliance checks and laboratory testing, EN 12926:2015 should be used together with national regulations governing chemicals in drinking water.

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

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

..........................................................................................................................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

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
1) Chemical Abstracts Service Registry Number 2) European Inventory of Existing Commercial Chemical Substances 3) 100 kPa = 1 bar. SIST EN 12926:2015

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

××××−=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
...