1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Standards PublicationBS EN 16037:2012Chemicals used for treatmentof water intended for humanconsumption Sodiumhydrogen sulfateBS EN 16037:2012 BRITISH STANDARDNational forewordThis British Standard i
2、s the UK implementation of EN 16037:2012.The UK participation in its preparation was entrusted to TechnicalCommittee CII/59, Chemicals for drinking water treatment.A list of organizations represented on this committee can beobtained on request to its secretary.This publication does not purport to in
3、clude all the necessaryprovisions of a contract. Users are responsible for its correctapplication. The British Standards Institution 2012. Published by BSI StandardsLimited 2012ISBN 978 0 580 69594 0ICS 71.100.80Compliance with a British Standard cannot confer immunity fromlegal obligations.This Bri
4、tish Standard was published under the authority of theStandards Policy and Strategy Committee on 31 August 2012.Amendments issued since publicationDate Text affectedBS EN 16037:2012EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 16037 July 2012 ICS 71.100.80 English Version Chemicals used for t
5、reatment of water intended for human consumption - Sodium hydrogen sulfate Produits chimiques uitiliss pour le traitement de leau destine la consommation humaine - Hydrognosulfate de sodium Produkte zur Aufbereitung von Wasser fr den menschlichen Gebrauch - Natriumhydrogensulfat This European Standa
6、rd was approved by CEN on 24 May 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
7、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 l
8、anguage 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, Gre
9、ece, 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 COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG
10、 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 16037:2012: EBS EN 16037:2012EN 16037:2012 (E) 2 Contents Page Foreword 3Introduction .31 Scope 52 Normative references 53 D
11、escription .54 Purity criteria 75 Test methods 86 Labelling Transportation Storage . 14Annex A (informative) General information on sodium hydrogen sulfate . 16Annex B (normative) General rules relating to safety 18Annex C (normative) Determination of arsenic, antimony and selenium (atomic absorptio
12、n spectrometry hydride technique) 19Bibliography . 25BS EN 16037:2012EN 16037:2012 (E) 3 Foreword This document (EN 16037:2012) 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 nationa
13、l standard, either by publication of an identical text or by endorsement, at the latest by January 2013, and conflicting national standards shall be withdrawn at the latest by January 2013. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
14、rights. CEN and/or CENELEC shall not be held responsible for identifying any or all such patent rights. According to the CEN/CENELEC Internal Regulations, the national standards organisations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croati
15、a, 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 the
16、 United Kingdom. BS EN 16037:2012EN 16037:2012 (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 b
17、e 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 Eu
18、ropean 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. BS EN 16037:2012EN 16037:2012 (E) 5 1 Scope This Europea
19、n Standard is applicable to sodium hydrogen sulfate used for treatment of water intended for human consumption. It describes the characteristics of sodium hydrogen sulfate and specifies the requirements and the corresponding test methods for sodium hydrogen sulfate. It gives information on its use i
20、n water treatment. 2 Normative references The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (
21、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
22、 3696) ISO 2479, Sodium chloride for industrial use Determination of matter insoluble in water or in acid and preparation of principal solutions for other determinations ISO 2483, Sodium chloride for industrial use Determination of the loss of mass at 110 degrees C ISO 3165, Sampling of chemical pro
23、ducts for industrial use Safety in sampling ISO 6206, Chemical products for industrial use Sampling Vocabulary ISO 6332, Water quality Determination of iron Spectrometric method using 1,10-phenanthroline ISO 8213, Chemical products for industrial use Sampling techniques Solid chemical products in th
24、e form of particles varying from powders to coarse lumps ISO 8288, 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 hydrogen sulfate. 3.1.2 Synonym or common name So
25、dium bisulfate. 3.1.3 Relative molecular mass 120,06 g/mol. BS EN 16037:2012EN 16037:2012 (E) 6 3.1.4 Empirical formula NaHSO4. 3.1.5 CAS-Registry-Number1)7681-38-1. 3.1.6 EINECS-Number2)231-665-7. 3.2 Commercial form Powder or beads, free flowing. 3.3 Physical properties 3.3.1 Appearance and odour
26、White to slightly yellow, odourless. 3.3.2 Density The bulk density of the product is approximately between 1 400 kg/m3and 1 450 kg/m3. 3.3.3 Solubility in water Approximately 1 080 g/l at 25 C. 3.3.4 Vapour pressure Not applicable. 3.3.5 Boiling point Not applicable. 3.3.6 Melting point at 100 kPa3
27、)Approximately 180 C. Note 1 to entry: The product decomposes at higher temperatures to sodium disulfate and water. 3.3.7 Specific heat Not applicable. 3.3.8 Viscosity (dynamic) Not applicable. 1) Chemical Abtracts Service Registry Number. 2) European Inventory of Existing Commercial Chemical Substa
28、nces. 3) 100 kPa = 1 bar. BS EN 16037:2012EN 16037:2012 (E) 7 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 hydrogen sulfate is hygroscopic. Aqueous solutions of the product exhibit a acid r
29、eaction and are corrosive to metals: acid constant pKS= 1,99 a solution with a mass fraction of 20 % has a pH value between 1 and 1,2 at 25 C. 4 Purity criteria 4.1 General This European Standard specifies the minimum purity requirements for sodium hydrogen sulfate used for the treatment of water in
30、tended 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
31、 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 produ
32、ct 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 a
33、dditives being present, this shall be notified to the user. 4.2 Composition of commercial product The commercial product shall contain a mass fraction of sodium hydrogen sulfate greater than 95,2 %. 4.3 Impurities and by-products The content of impurities and by-products shall be in accordance with
34、Table 1. BS EN 16037:2012EN 16037:2012 (E) 8 Table 1 Impurities and by-products Parameter Limit in % (mass fraction) Sodium sulfate max. 4,8 Water max. 0,8Water insoluble substances max. 0,05 Iron max. 0,014.4 Chemical Parameters The product shall conform to the requirements specified in Table 2. Ta
35、ble 2 Chemical parameters Parameter Limit in mg/kg NaHSO4Arsenic (As) max. 0,1 Cadmium (Cd) max. 0,1 Chromium (Cr) max. 1 Mercury (Hg) max. 0,1 Nickel (Ni) max. 1 Lead (Pb) max. 1 Antimony (Sb) max. 1 Selenium (Se) max. 1 NOTE Pesticides, polycyclic aromatic hydrocarbons and halogenated organic subs
36、tances are not by-products of the manufacturing process. For parametric values on chemical parameters content in drinking water, see 1. 5 Test methods 5.1 Sampling Prepare the laboratory sample(s) required by the relevant procedure described in ISO 8213. Observe the general recommendations of ISO 31
37、65 and take account of ISO 6206. 5.2 Analysis 5.2.1 Determination of sodium hydrogen sulfate 5.2.1.1 Principle Alkalimetric titration with sodium hydroxide solution. 5.2.1.2 Reagents 5.2.1.2.1 All reagents shall be of a recognized analytical grade. De-ionized water (conforming to grade 3 of EN ISO 3
38、696) is sufficient. 5.2.1.2.2 Sodium hydoxide solution, c(NaOH) = 0,1 mol/l BS EN 16037:2012EN 16037:2012 (E) 9 5.2.1.3 Apparatus Ordinary laboratory apparatus and glassware together with the following. 5.2.1.3.1 Potentiometric titrimeter 5.2.1.3.2 Automatic burette, volume 50 ml, equipped with an i
39、njection tip. 5.2.1.3.3 Electromechanical stirrer 5.2.1.3.4 Glass beaker, capacity 250 ml 5.2.1.4 Procedure 5.2.1.4.1 Test solution Weigh, to the nearest 0,1 mg, a test portion of approximately 0,2 g into a dry, clean beaker (5.2.1.3.4). 5.2.1.4.2 Determination Input the calculation data in the titr
40、ation microprocessor in accordance with the instruction manual. Place the pH electrode in the titration beaker and titrate with the sodium hydroxide solution (5.2.1.2.2). Record the titration curve and determine the inflection point as the equivalent point of the potentiometric titration. 5.2.1.5 Ex
41、pression of results The sodium hydrogen sulfate content, C1, expressed as a percentage by mass, is given by the following formula (1): mcVC1201= (1) where V is the volume, expressed in millilitres, of the sodium hydroxide solution (5.2.1.2.2) used for the titration; c is the concentration, in moles
42、per litre, of the sodium hydroxide solution (5.2.1.2.2); m is the mass of the test portion, expressed in grams. 120 is the mass equivalent of sodium hydrogen sulfate in grams corresponding to 1 000 ml of sodium hydroxide solution with c(NaOH) = 0,1 mol/l. 5.2.1.6 Repeatability limit The absolute dif
43、ference between two single test results, obtained under repeatability conditions, shall not be greater than the repeatability value, r, as calculated from the following formula: r = 0,001 z where BS EN 16037:2012EN 16037:2012 (E) 10 z is the mean of the two results, expressed in mass fraction %. NOT
44、E Repeatibility conditions are conditions where mutually independent test results are obtained with the same method on identical test material in the same laboratory by the same operator using the same equipment within short intervals of time. 5.2.2 By-products 5.2.2.1 Determination of water The con
45、tent of water is determined according to ISO 2483. 5.2.2.2 Determination of water insoluble substances The content of insoluble substances is determined according to ISO 2479. 5.2.2.3 Determination of sodium sulfate The content of sodium sulfate, CS, expressed in mass fraction %, is calculated by th
46、e following formula (2): Cs= 100 - C1 CW Ci C2(2) where C1is the content of sodium hydrogen sulfate (see 5.2.1); CWis the content of water (see 5.2.2.1); Ciis the content of insoluble substances (see 5.2.2.2); C2is the content of iron (see 5.2.2.4). 5.2.2.4 Determination of iron (Fe) 5.2.2.4.1 Princ
47、iple Iron is determined by visible absorption spectrometry of its 1,10-phenanthroline complex. 5.2.2.4.2 Reagents All reagents shall be of a recognised analytical grade and the water used shall conform to the appropriate grade specified in EN ISO 3696. 5.2.2.4.2.1 Nitric acid, solution, c(HNO3) = 2,
48、5 mol/l. 5.2.2.4.3 Procedure 5.2.2.4.3.1 Test solution Weigh, to the nearest 0,1 mg, 1 g (m) of a test portion into a 100 ml one-mark volumetric flask. Add 0,5 ml of nitric acid (5.2.2.4.2.1), dilute with a few millilitres of water and mix. Dilute to volume with water and homogenize. 5.2.2.4.3.2 Det
49、ermination The concentration of iron in the test solution (5.2.2.4.3.1) is determined according to ISO 6332. BS EN 16037:2012EN 16037:2012 (E) 11 The determination gives an interim result (y) expressed in milligrams per litre that needs to be corrected to give the final concentration according to the formula in 5.2.2.4.4. 5.2.2.4.4 Expression of results From the interim results (y) determined (see 5.2.2.4.3.2), the content C2of iron in the test portion, expressed in milligrams per
