EN 12678:2008
(Main)Chemicals used for treatment of water intended for human consumption - Potassium peroxomonosulfate
Chemicals used for treatment of water intended for human consumption - Potassium peroxomonosulfate
This European Standard is applicable to potassium peroxomonosulfate used for treatment of water intended for human consumption. It describes the characteristics of potassium peroxomonosulfate and specifies the requirements and the corresponding test methods for potassium peroxomonosulfate. It gives information on its use in water treatment.
Produkte zur Aufbereitung von Wasser für den menschlichen Gebrauch - Kaliumperoxomonosulfat
Diese Europäische Norm gilt für Kaliumperoxomonosulfat zur Aufbereitung von Wasser für den menschlichen
Gebrauch. Sie beschreibt die Eigenschaften von Kaliumperoxomonosulfat und legt die Anforderungen sowie
die entsprechenden Prüfverfahren für Kaliumperoxomonosulfat fest. Sie gibt Informationen für seine
Anwendung in der Wasseraufbereitung.
Produits chimiques utilisés pour le traitement de l'eau destinée à la consommation humaine - Peroxomonosulfate de potassium
La présente Norme européenne s’applique au peroxomonosulfate de potassium utilisé pour le traitement de l’eau destinée à la consommation humaine. Elle décrit les caractéristiques du peroxomonosulfate de potassium 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 - Kalijev peroksomonosulfat
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 - Kalijev peroksomonosulfatProdukte zur Aufbereitung von Wasser für den menschlichen Gebrauch - KaliumperoxomonosulfatProduits chimiques utilisés pour le traitement de l'eau destinée à la consommation humaine - Peroxomonosulfate de potassiumChemicals used for treatment of water intended for human consumption - Potassium peroxomonosulfate71.100.80Chemicals for purification of water13.060.20Pitna vodaDrinking waterICS:Ta slovenski standard je istoveten z:EN 12678:2008SIST EN 12678:2008en,fr,de01-november-2008SIST EN 12678:2008SLOVENSKI
STANDARDSIST EN 12678:20011DGRPHãþD
EUROPEAN STANDARDNORME EUROPÉENNEEUROPÄISCHE NORMEN 12678July 2008ICS 71.100.80Supersedes EN 12678:2000
English VersionChemicals used for treatment of water intended for humanconsumption - Potassium peroxomonosulfateProduits chimiques utilisés pour le traitement de l'eaudestinée à la consommation humaine - Peroxomonosulfatede potassiumProdukte zur Aufbereitung von Wasser für denmenschlichen Gebrauch - KaliumperoxomonosulfatThis European Standard was approved by CEN on 28 June 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 12678:2008: ESIST EN 12678:2008
General information on potassium peroxomonosulfate.16 Annex B (normative)
General rules relating to safety.18 Annex C (normative)
Determination of arsenic, antimony and selenium (atomic absorption spectrometry hydride technique).19 Bibliography.25
1) Chemical Abtracts Service Registry Number. 2) European Inventory of Existing Commercial Chemical Substances. 3) 100 kPa = 1 bar SIST EN 12678:2008
'
HSO4- + H2O
(1) is:
+ 1,82 V at 25°C 4 Purity criteria 4.1 General This European Standard specifies the minimum purity requirements for Potassium peroxomonosulfate 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 the 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 KHSO5 (potassium peroxomonosulfate) at a mass fraction greater than 45 per cent or the manufacturer’s declared values. NOTE Typical composition in mass fraction should be approximately 45 % KHSO5, potassium hydrogen sulfate (KHSO4), 25 % and potassium sulfate (K2SO4) 30 % . SIST EN 12678:2008
Type 1 Type 2 Arsenic (As) max. 2 10 Cadmium (Cd) max. 1 10 Chromium (Cr) max. 0,4 10 Mercury (Hg) max. 4 8 Nickel (Ni) max. 1 10 Lead (Pb) max. 2 10 Antimony (Sb) max. 10 10 Selenium (Se) max. 10 10 NOTE Cyanide is usually not relevant in a strong oxidizing medium. Pesticides and polycyclic aromatic hydrocarbons are not by-products of the manufacturing process. 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 Analysis 5.2.1 Determination of potassium peroxomonosulfate (KHSO5) (active ingredient) 5.2.1.1 Principle Iodometric titration with sodium thiosulfate standard volumetric solution in sulfuric acid medium. The method depends on the oxidizing action of the peroxomonosulfate ion (HSO5)- on iodide ions, Equation (2) and the subsequent determination of iodine formed, through the reducing agent sodium thiosulfate, Equation (3). The inflection point of the potentiometric titration is located around 250 mV (reference to Ag/AgCl-Electrode). HSO5- + 3 Kl + H2SO4 → HSO4- + Kl3 + K2SO4 + H2O (2) Kl3 + 2 Na2S2O3 → Kl + 2 Nal + Na2S4O6 (3) SIST EN 12678:2008
Place 750 ml of water in a heat resistant beaker (volume 2 000 ml). Measure 135 ml of sulfuric acid, mass fraction 98 % , and dilute in the water by small additions and under gentle stirring. Cover the beaker with a watch glass and keep it for several hours in a safe place to cool. SAFETY PRECAUTIONS: During dilution the solution becomes hot; wear safety goggles, protective gloves and protective clothing. 5.2.1.2.2 Hydrochloric acid solution, mass fraction 10 %
5.2.1.2.3 Potassium iodide solution, mass fraction 30 %
Weigh, to the nearest 0,1 g, 60 g of potassium iodide, iodate-free grade, and dissolve it in 140 ml of water. Keep the solution in a dark place. 5.2.1.2.4 Starch solution, mass fraction 1 %
Weigh 1,00 g of soluble starch and make a slurry with 5 ml of water. Add 95 ml of water to the slurry and boil for several minutes to dissolve it. Cool the solution. This solution needs refrigeration to avoid decomposition of the starch which results in a vague end point. Keep the solution cool and use it within one week. NOTE Commercial starch solutions as indicators for iodine titration exist and can be used in place of the specified starch solution provided that their efficiency has been previously tested. 5.2.1.2.5 Potassium iodate (KIO3) 5.2.1.2.6 Sodium thiosulfate standard volumetric solution, c(Na2S2O3.5H2O) = 0,1 mol/l Standard volumetric solutions of sodium thiosulfate are commercially available.
Alternatively a standard volumetric s
...
Questions, Comments and Discussion
Ask us and Technical Secretary will try to provide an answer. You can facilitate discussion about the standard in here.