EN 12125:2012
(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 thiosulfate used for treatment of water intended for human consumption. It describes the characteristics and specifies the requirements of sodium thiosulfate and refers to the corresponding analytical methods. It gives information for its use in water treatment.
Produkte zur Aufbereitung 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 enthält Angaben zu dessen Anwendung 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 du thiosulfate de sodium, en spécifie les exigences ainsi que les méthodes d'analyse correspondantes. Elle donne des informations pour son emploi dans le traitement de l'eau.
Kemikalije, ki se uporabljajo za pripravo pitne vode - Natrijev tiosulfat
Ta dokument obravnava natrijev tiosulfat, ki se uporablja za pripravo pitne vode. Opisuje značilnosti natrijevega tiosulfata ter določa zahteve in ustrezne preskusne metode zanj. Standard podaja informacije za uporabo natrijevega tiosulfata pri pripravi vode.
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 tiosulfatProdukte zur Aufbereitung von Wasser für den menschlichen Gebrauch - NatriumthiosulfatProduits chimiques utilisés pour le traitement de l'eau destinée à 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 12125:2012SIST EN 12125:2013en,fr,de01-april-2013SIST EN 12125:2013SLOVENSKI
STANDARDSIST EN 12125:20051DGRPHãþD
EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
EN 12125
November 2012 ICS 71.100.80 Supersedes EN 12125:2005English 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 Aufbereitung von Wasser für den menschlichen Gebrauch - Natriumthiosulfat This European Standard was approved by CEN on 23 September 2012.
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
Management Centre:
Avenue Marnix 17,
B-1000 Brussels © 2012 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 12125:2012: ESIST EN 12125:2013
1) Chemical Abstracts Service Registry Number. 2) European Inventory of Existing Commercial Chemical Substances. 3) 100 kPa = 1 bar. SIST EN 12125:2013
Table 1 — Chemical parameters
Parameter Limitmg/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 12125:2013
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 oxidising 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 recognised 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 12125:2013
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, determining roughly the element content of the test sample from simple calibration. The steps in which internal standards have to be ad
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