《BS-EN-12485-2001.pdf》由会员分享,可在线阅读,更多相关《BS-EN-12485-2001.pdf(60页珍藏版)》请在三一文库上搜索。
1、BRITISH STANDARD BS EN 12485:2001 Chemicals used for treatment of water intended for human consumption Calcium carbonate, high-calcium lime and half-burnt dolomite Test methods The European Standard EN 12485:2001 has the status of a British Standard ICS 71.100.80 NO COPYING WITHOUT BSI PERMISSION EX
2、CEPT AS PERMITTED BY COPYRIGHT LAW Licensed Copy: sheffieldun sheffieldun, na, Sat Oct 28 05:42:40 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS EN 12485:2001 This British Standard, having been prepared under the direction of the Sector Policy and Strategy Committee for Materials and Chemicals, was
3、published under the authority of the Standards Policy and Strategy Committee on 10 September 2001 BSI 10 September 2001 ISBN 0 580 37401 7 National foreword This British Standard is the official English language version of EN 12485:2001. The UK participation in its preparation was entrusted to Techn
4、ical Committee CII/59, Chemicals for drinking water treatment, which has the responsibility to: A list of organizations represented on this committee can be obtained on request to its secretary. Additional information The United Kingdom voted against the acceptance of this standard at the Formal Vot
5、e stage. The principal UK objections were as follows. a) The document specifies quality assurance procedures (see 3.9) which do not belong in a test method standard. b) A soft brush is specified in 4.1.2.5 for cleaning sieve meshes but sieve manufacturers generally recommend ultrasonic cleaning. c)
6、The fusion cake obtained after fusion with lithium tetraborate, as described in 5.1, does not readily dissolve in hydrochloric acid. The use of nitric acid would have been preferred because it dissolves the fusion cake more effectively. In addition to this, the dilution ratio of the sample, as descr
7、ibed in the method, is considered too high therefore the use of a test portion of 1 g of the sample would have been preferred. d) For the determination of magnesium and manganese, it is considered sufficient to prepare the test solution by digestion of the test sample in hydrochloric acid rather tha
8、n by fusion with lithium tetraborate (as described in 5.1). e) No information is given to enable the user to choose between the two methods for digestion with nitric acid described in 5.3 and 5.4. Also, it is considered that for high-calcium limes, digestion with hydrochloric acid would be sufficien
9、t to release trace elements into solution and that a lower dilution ratio would obviate the need for a graphite furnace (as described in 8.1) thereby allowing a flame technique to be used for the analysis instead. f) Both the Zeeman background correction and the Smith Heifje background correction ar
10、e considered to be more suitable methods for compensating for the interferences referred to in 7.1.4 and 8.1.4 than the deuterium background correction specified in 7.1.4. Article 10 of the Council of the European Community Directive 98/83/EC on the quality of water intended for human consumption re
11、quires Member States to ensure that substances and materials (including associated impurities) used in the preparation of drinking water do not remain in treated water at concentrations that are higher than necessary or that would reduce the protection of public health provided for in the Directive.
12、 This requirement is given effect in England and Wales by regulation 25 of the Water Supply (Water Quality) Regulations 1989 (similar provisions apply In Scotland and Northern Ireland). Regulation 25 makes provision for attaching conditions of use to chemicals and filter media that are authorized fo
13、r use in public water supplies. Details of conditions of use are contained in the List of Products and Processes Approved Under Regulations 25 and 26 For Use In Connection With The Supply of Water For Drinking, Washing, Cooking And Food Production Purposes published by the Drinking Water Inspectorat
14、e, Floor 2/A1, Ashdown House, 123 Victoria Street, London SW1 6DE (www.dwi.detr.gov.uk). Cross-references The British Standards which implement international or European publications may be found in the BSI Standards Catalogue under the section entitled “International Standards Correspondence Index”
15、, or by using the “Find” facility of the BSI Standards Electronic Catalogue. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself conf
16、er immunity from legal obligations. aid enquirers to understand the text; present to the responsible European committee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed; monitor related international and European developments and promulgate them in the
17、 UK. Summary of pages This document comprises a front cover, an inside front cover, the EN title page, pages 2 to 57 and a back cover. The BSI copyright date displayed in this document indicates when the document was last issued. Amendments issued since publication Amd. No.DateComments Licensed Copy
18、: sheffieldun sheffieldun, na, Sat Oct 28 05:42:40 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 12485 April 2001 ICS 71.100.80 English version Chemicals used for treatment of water intended for human consumption - Calcium carbonate, high-calcium lim
19、e and half- burnt dolomite - Test methods Produits chimiques pour le traitement de leau destine la consommation humaine - Carbonate de calcium, chaux et dolomie semi calcine - Mthodes danalyse Produkte zur Aufbereitung von Wasser fr den menschlichen Gebrauch - Calciumcarbonat, Weikalk und halbgebran
20、nter Dolomit - Analytische Verfahren This European Standard was approved by CEN on 21 January 2001. 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-
21、to-date lists and bibliographical references concerning such national standards may be obtained on application to the 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
22、the responsibility of a CEN member into its own language and notified to the Management Centre has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembou
23、rg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG Management Centre: rue de Stassart, 36 B-1050 Brussels 2001 CENAll rights of exploitation in any form and by any mean
24、s reserved worldwide for CEN national Members. Ref. No. EN 12485:2001 E Licensed Copy: sheffieldun sheffieldun, na, Sat Oct 28 05:42:40 GMT+00:00 2006, Uncontrolled Copy, (c) BSI Page 2 EN 12485:2001 Contents Page Foreword3 1Scope 4 2Normative references 4 3General requirements4 3.1Number of determi
25、nations4 3.2Methods for analysis .4 3.3Sample preparation .5 3.4Reagents.6 3.5Glassware.6 3.6Expression of results 6 3.7Repeatability and reproducibility limits.7 3.8Test report 7 3.9Quality assurance procedures .7 4Determination of screen oversize of high-calcium lime 8 4.1Air-jet sieving method.8
26、4.2Wet sieving method.10 5Preparation of test solutions11 5.1Fusion with lithium tetraborate 11 5.2Extraction with hydrochloric acid12 5.3Microwave digestion with nitric acid .13 5.4Pressurized digestion with nitric acid .14 6Conventional methods of determining major and minor constituents15 6.1Dete
27、rmination of free water 15 6.2Determination of carbon dioxide16 6.3Determination of residue insoluble in hydrochloric acid 17 6.4Determination of content of water soluble calcium oxide or calcium hydroxide .18 6.5Water-insoluble matter20 6.6Determination of free CaO in half-burnt dolomite21 6.7Deter
28、mination of calcium oxide and magnesium oxide 22 6.8Determination of sulfate content24 6.9Calculation of composition of commercial product.26 7Determination of minor constituents.27 7.1Determination of minor constituents by AAS flame technique 27 7.2Determination of minor constituents by ICP-OES31 8
29、Determination of trace elements36 8.1Determination of lead, cadmium, chromium and nickel by AAS graphite tube technique36 8.2Determination of lead, cadmium, chromium and nickel by ICP-OES.41 8.3Determination of arsenic, antimony and selenium by AAS hydride technique 45 8.4Determination of mercury by
30、 cold-vapour technique48 Annex A (informative) Analytical sheme52 Annex B (informative) Precision data for the test methods.56 Bibliography57 Licensed Copy: sheffieldun sheffieldun, na, Sat Oct 28 05:42:40 GMT+00:00 2006, Uncontrolled Copy, (c) BSI Page 3 EN 12485:2001 Foreword This European Standar
31、d 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 national standard, either by publication of an identical text or by endorsement, at the latest by October 2001, and conflicting natio
32、nal standards shall be withdrawn at the latest by October 2001. The annexes A and B are informative. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Czech Republic, Den
33、mark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and the United Kingdom. Licensed Copy: sheffieldun sheffieldun, na, Sat Oct 28 05:42:40 GMT+00:00 2006, Uncontrolled Copy, (c) BSI Page 4 EN 12485:2001 1 Scope This
34、European standard describes methods used of the analyses of calcium carbonate, high-calcium lime and half- burnt dolomite used to treat water for human consumption. NOTEOf the reference methods described, the atomic spectroscopy methods are preferred to the conventional methods. If methods other tha
35、n those described are used, it should be demonstrated that the results are equivalent to those of the reference methods. The schematic diagram of the chemical analysis is given in annex A (Figures A.1 to A.4). 2 Normative references This European Standard incorporates by dated or undated reference,
36、provisions from other publications. These normative references are cited at the appropriate places in the text and the publications are listed hereafter. For dated references, subsequent amendments to or revisions of any of these publications apply to this European standard only when incorporated in
37、 it by amendment or revision. For undated references the latest edition of the publication referred to applies (including amendments). EN 459-2, Building lime Part 2: Test methods. EN 1017, Chemicals used for treatment of water intended for human consumption - Half-burnt dolomite. EN 1018, Chemicals
38、 used for treatment of water intended for human consumption - Calcium carbonate. EN 12518, Chemicals used for treatment of water intended for human consumption - High-calcium lime. EN ISO 3696, Water for analytical laboratory use - Specification and test methods (ISO 3696:1987). ISO 3165, Sampling o
39、f chemical products for industrial use - Safety in sampling. ISO 4793, Laboratory sintered (fritted) filters - Porosity grading, classification and designation. ISO 5725-2, Accuracy (trueness and precision) of measurement methods and results - Part 2 : Basic method for the determination of repeatabi
40、lity and reproducibility of a standard measurement method. 3 General requirements 3.1 Number of determinations Two analyses shall be carried out to determine the various constituents (see clause 5 to clause 8, see also 3.6). 3.2 Methods for analysis The methods to be used for analysis of half-burnt
41、dolomite, calcium carbonate and high calcium lime and the principle of each method are listed in Table 1. Licensed Copy: sheffieldun sheffieldun, na, Sat Oct 28 05:42:40 GMT+00:00 2006, Uncontrolled Copy, (c) BSI Page 5 EN 12485:2001 Table 1 Methods for analysis DeterminationMethodPrincipleStandard
42、Screen oversize4.1Air-jet sievingEN 12518 4.2Wet sievingEN 12518 Free water6.1GravimetryEN 12518 Carbon dioxide6.2GravimetryEN 1017, EN 12518 Residue insoluble in hydrochloric acid 6.3Acidimetry, GravimetryEN 1018 Water-soluble calcium oxide or calcium hydroxide 6.4Acidimetric titrationEN 12518 Wate
43、r-insoluble constituents6.5GravimetryEN 12518 Free calcium oxide6.6Extraction, acidimetric titrationEN 1017 Calcium and magnesium6.7Complexometric titrationEN 1017, EN 1018 Sulfur6.8Barium sulfate gravimetryEN 1017 Magnesium, Silicium, Aluminium, Iron, Manganese 7.1 or 7.2 AAS (flame) or ICP-OES EN
44、1017, EN 1018 EN 1017, EN 12518 EN 1017, EN 12518 EN 1017, EN 12518 EN 12518 Sulfate7.2ICP-OESEN 1017 Lead, Cadmium, Chromium, Nickel 8.1 or 8.2 AAS (flameless) or ICP-OES EN 1017, EN 1018, EN 2518 Arsenic, Antimony, Selenium 8.3AAS (hydride)EN 1017, EN 1018, EN 12518 Mercury8.4AAS (cold-vapour tech
45、nique)EN 1017, EN 1018, EN 12518 3.3 Sample preparation The general recommendations specified in ISO 3165 shall be observed when sampling. Sampling shall be performed in accordance with EN 459-2. For products less than 6 mm grain size, the size of the sample shall be 1l. Before performing the chemic
46、al analyses, the size of the sample shall be reduced by using a sample divider and/or by dividing it into four parts in order to obtain a suitable subsample. The coarse-grain material in this sample shall be reduced to a size of less than 0,2 mm before performing the chemical analysis. When sampling
47、 milk of lime, the material from which the sample is to be taken shall be thoroughly mixed with an electrically driven stirrer of adequate power. The milk of lime shall be dried at (105 ? 5) ?C (see 6.1) before being analysed chemically. Since the subsamples under examination are altered by the abso
48、rption of moisture and carbon dioxide, their exposure to air shall be minimized. They shall therefore be transported and stored in air-tight containers and all the handling shall be carried out as quickly as possible. Licensed Copy: sheffieldun sheffieldun, na, Sat Oct 28 05:42:40 GMT+00:00 2006, Un
49、controlled Copy, (c) BSI Page 6 EN 12485:2001 3.4 Reagents All reagents shall be of a recognized analytical grade appropriate for the method being used. The water used shall conform to grade 3 in accordance with EN ISO 3696 unless otherwise specified in the method. The concentration of the analytes in the water and reagents shall be negligible compared with the lowest concentration to be determined. The concentrated liquids used for the reagents in this standard have the following densities (?) (in grams per millilitre at 20 ?C) : ? hydrochloric ac
链接地址:https://www.31doc.com/p-3738486.html