EN 12125:2005
(Main)Chemicals used for treatment of water intended for human consumption - Sodium thiosulfate
Chemicals used for treatment of water intended for human consumption - Sodium thiosulfate
This European Standard is applicable to sodium thiosulphate used for treatment of water intended for human consumption .It describes the characteristics and specifies the requirements of sodium thiosulphate and refers to the corresponding analytical methods. It gives information for its use in water treatment..
Produkte zur Aufbereintung von Wasser für den menschlichen Gebrauch - Natriumthiosulfat
Diese Europäische Norm gilt für Natriumthiosulfat zur Aufbereitung von Wasser für den menschlichen
Gebrauch. Sie beschreibt die Eigenschaften von Natriumthiosulfat, legt die Anforderungen an
Natriumthiosulfat fest und verweist auf die entsprechenden Analysenverfahren. Sie gibt Informationen über
die Anwendung von Natriumthiosulfat in der Wasseraufbereitung.
Produits chimiques utilisés pour le traitement de l'eau destinée à la consommation humaine - Thiosulfate de sodium
La présente Norme européenne s�applique au thiosulfate de sodium utilisé pour le traitement de l�eau
destinée à la consommation humaine. Elle décrit les caractéristiques et spécifie les exigences du
thiosulfate de sodium et les méthodes d'analyses correspondantes. Elle donne des informations pour son
emploi dans le traitement de l'eau.
Kemikalije, ki se uporabljajo za pripravo pitne vode - Natrijev tiosulfat
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 tiosulfatProdukte zur Aufbereintung von Wasser für den menschlichen Gebrauch - NatriumthiosulfatProduits chimiques utilisés pour le traitement de l'eau destinée a la consommation humaine - Thiosulfate de sodiumChemicals used for treatment of water intended for human consumption - Sodium thiosulfate71.100.80Chemicals for purification of water13.060.20Pitna vodaDrinking waterICS:Ta slovenski standard je istoveten z:EN 12125:2005SIST EN 12125:2005en01-september-2005SIST EN 12125:2005SLOVENSKI
STANDARDSIST EN 12125:20001DGRPHãþD
EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
EN 12125
June 2005 ICS 71.100.80
Supersedes EN 12125:1998
English version
Chemicals used for treatment of water intended for human consumption - Sodium thiosulfate
Produits chimiques utilisés pour le traitement de l'eau destinée à la consommation humaine - Thiosulfate de sodium
Produkte zur Aufbereintung von Wasser für den menschlichen Gebrauch - Natriumthiosulfat This European Standard was approved by CEN on 12 May 2005.
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 Central Secretariat 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 Central Secretariat has the same status as the official versions.
CEN members are the national standards bodies of Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION COMITÉ EUROPÉEN DE NORMALISATION EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre: rue de Stassart, 36
B-1050 Brussels © 2005 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 12125:2005: ESIST EN 12125:2005
General information on sodium thiosulfate.16 Bibliography.18
1) Chemical Abstracts Service Registry Number. 2) European Inventory of Existing Commercial Chemical Substances. 3) 100 kPa = 1 bar. SIST EN 12125:2005
Table 1 – Chemical parameters
Parameter Limit
mg/kg of commercial product
Antimony (Sb) max. 2 Arsenic (As) max. 0,5 Cadmium (Cd) max. 0,1 Chromium (Cr) max. 5 Lead (Pb) max. 5 Mercury (Hg) max. 0,1 Nickel (Ni) max. 5 Selenium (Se) max. 2 NOTE
Pesticides and polycyclic aromatic hydrocarbons and cyanides (CN ) are not relevant in sodium thiosulfate because the raw materials used in the manufacturing are free of them. For parametric values of sodium thiosulfate on trace metal content in drinking water, see [1]. 5 Test methods 5.1 Sampling Observe the general 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 Analyses 5.2.1 Main product The sodium thiosulfate content shall be determined in accordance with ISO 10636. 5.2.2 Impurities 5.2.2.1 Sulfate The content of sodium sulfate (Na2SO4) shall be determined in accordance with ISO 22743. SIST EN 12125:2005
AAS 193,7 n.a. Sb see 5.2.3.3 Hydride
AAS 217,6 n.a. Cd ISO 6353-1 GM 29see 5.2.3.2 AAS 228,8 air-acetylene Cr ISO 6353-1 GM 29see 5.2.3.2 AAS 357,8 air-acetylene Pb ISO 6353-1 GM 29see 5.2.3.2 AAS 217,0 or 283,3 air-acetylene Ni ISO 6353-1 GM 29see 5.2.3.2 AAS 232,0 oxidizing acetylene-air Se see 5.2.3.3 Hydride
AAS 196,0 n.a. Hg in accordance withISO 5993 flameless
AAS 253,6 n.a. AAS = Atomic Absorption Spectroscopy n.a.
= not applicable 5.2.3.2 Determination of cadmium (Cd), chromium (Cr), lead (Pb) and nickel (Ni) 5.2.3.2.1
Principle The elements cadmium (Cd), chromium (Cr), lead (Pb) and nickel (Ni) are determined using atomic absorption spectrometry with the standard additions technique. 5.2.3.2.2
Reagents All reagents shall be of a recognized analytical grade and the water used shall conform to the grade 3 specified in EN ISO 3696. 5.2.3.2.2.1 Standard solution (100 µg/l Cd, Cr ,Pb or Ni) The standard solution shall be freshly prepared on the day of use by individual dilution of a stock solution. This stock solution with a Cd, Cr, Pb or Ni content of at least 1 mg/l shall be made by dilution of standard solutions of Cd, Cr, Pb and Ni which are available from all major suppliers of laboratory chemicals. This stock solution shall be kept in containers of tetrafluoroethylene-hexafluoropropylene copolymer (FEP), polytetrafluoroethylene (PTFE) or polyethylene (PE). SIST EN 12125:2005
Apparatus Ordinary laboratory apparatus and the following: 5.2.3.2.3.1 Atomic absorption spectrometer with the measurement parameters specified in Table 2. 5.2.3.2.4
Procedure 5.2.3.2.4.1 Test portion Weigh 1 g (m) to the nearest 0,01 mg of the laboratory sample into a 100 ml one-mark volumetric flask and make up to the mark at 20 °C with water. 5.2.3.2.4.2 Determination The reference solutions shall be made by spiking the sample with the standard solutions, which contain stepwise increasing contents of the elements to be determined. NOTE The amount of internal standard to be added can be estimated from a preliminary investigation, determinin
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