1、BS EN 12485:2010ICS 13.060.20; 71.100.80NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBRITISH STANDARDChemicals used fortreatment of waterintended for humanconsumption Calcium carbonate,high-calcium lime,half-burnt dolomite,magnesium oxide andcalcium magnesiumcarbonate Testme
2、thodsThis British Standardwas published under theauthority of the StandardsPolicy and StrategyCommittee on 31 May 2010 BSI 2010ISBN 978 0 580 58193 9Amendments/corrigenda issued since publicationDate CommentsBS EN 12485:2010National forewordThis British Standard is the UK implementation of EN 12485:
3、2010. Itsupersedes BS EN 12485:2001 which is withdrawn.The UK participation in its preparation was entrusted to TechnicalCommittee CII/59, Chemicals for drinking water treatment.A list of organizations represented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 be obtained onrequest to its secretary.This publication does not
4、 purport to include all the necessary provisionsof a contract. Users are responsible for its correct application.Compliance with a British Standard cannot confer immunityfrom legal obligations.BS EN 12485:2010EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 12485 April 2010 ICS 71.100.80 Superse
5、des EN 12485:2001English Version Chemicals used for treatment of water intended for human consumption - Calcium carbonate, high-calcium lime, half-burnt dolomite, magnesium oxide and calcium magnesium carbonate -Test methods Produits chimiques utiliss pour le traitement de leau destine la consommati
6、on humaine - Carbonate de calcium, chaux et dolomie semi calcine - Mthodes danalyse Produkte zur Aufbereitung von Wasser fr den menschlichen Gebrauch - Calciumcarbonat, Weikalk, halbgebrannter Dolomit, Magnesiumoxid und Calciummagnesiumcarbonat - Analytische Verfahren This European Standard was appr
7、oved by CEN on 18 March 2010. 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
8、standards 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 translation under the responsibility of a CEN member into its own language and notif
9、ied to the CEN 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, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxemb
10、ourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG Management Centre: Avenue Marnix 17, B-1000 Brussels 2010 CEN All right
11、s of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 12485:2010: EBS EN 12485:2010EN 12485:2010 (E) 2 Contents Page Foreword 31 Scope 42 Normative references 43 General requirements 43.1 Number of determinations 43.2 Methods for analysis .43.3 Sampl
12、e preparation .63.4 Reagents .63.5 Glassware .73.6 Expression of results 73.7 Repeatability and reproducibility limits 83.8 Test report 84 Determination of screen oversize of high-calcium lime 84.1 Air-jet sieving method .84.2 Wet sieving method 105 Preparation of test solutions . 125.1 Fusion with
13、lithium tetraborate . 125.2 Extraction with hydrochloric acid . 135.3 Microwave digestion with nitric acid 145.4 Pressurized digestion with nitric acid 146 Conventional methods of determining major and minor constituents . 156.1 Determination of free water . 156.2 Loss on ignition at 450 C 166.3 Det
14、ermination of carbon dioxide . 176.4 Determination of residue insoluble in hydrochloric acid . 186.5 Determination of content of water soluble calcium oxide or calcium hydroxide (reference method) 196.6 Determination of sugar soluble calcium oxide or calcium hydroxide (alternative method) . 216.7 Wa
15、ter-insoluble matter . 236.8 Determination of free CaO . 246.9 Determination of calcium oxide and magnesium oxide . 256.10 Determination of sulfate . 286.11 Determination of solubility index by conductivity 296.12 Calculation of the composition of a commercial product 327 Determination of constituen
16、ts by modern techniques . 347.1 Determination of minor constituents by AAS flame technique . 347.2 Determination of major and minor constituents by ICP-OES 388 Determination of trace elements . 438.1 Determination of lead, cadmium, chromium and nickel by AAS graphite tube technique . 438.2 Determina
17、tion of lead, cadmium, chromium and nickel by ICP-OES 498.3 Determination of arsenic, antimony and selenium by AAS hydride technique . 538.4 Determination of mercury by cold-vapour technique . 56Annex A (informative) Analytical scheme . 60Annex B (informative) Table B.1: Precision data for the test
18、methods . 66Bibliography . 67BS EN 12485:2010EN 12485:2010 (E) 3 Foreword This document (EN 12485:2010) 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 pu
19、blication of an identical text or by endorsement, at the latest by October 2010, and conflicting national standards shall be withdrawn at the latest by October 2010. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN and/or CENEL
20、EC shall not be held responsible for identifying any or all such patent rights. This document supersedes EN 12485:2001. Annexes A and B are informative. Significant technical differences between this edition and EN 12485:2001 are as follows: a) addition of a method for determination of sugar-soluble
21、 calcium oxide or calcium hydroxide (see 6.6); b) addition of a method for determination of solubility index (see 6.11). According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium,
22、 Bulgaria, Croatia, 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 the United Kingdom. BS EN 12485:2
23、010EN 12485:2010 (E) 4 1 Scope This European Standard specifies the methods used for the chemical analyses and the determination of physical properties of calcium carbonate, high-calcium lime, half-burnt dolomite, magnesium oxide and calcium magnesium carbonate used to treat water for human consumpt
24、ion. This document describes the reference methods and, in certain cases, an alternative method which can be considered to be equivalent. In the case of a dispute, only the reference methods are used. Any other methods may be used provided they are calibrated, either against the reference methods or
25、 against internationally accepted reference materials, in order to demonstrate their equivalence. NOTE Schematic diagrams of the analyses are given in Annex A (Figures A.1 to A.6). 2 Normative references The following referenced documents are indispensable for the application of this document. For d
26、ated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. 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
27、 1018, Chemicals 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 prEN 16003, Chemicals used for treatment of water intended for human consumption Calcium magnesium carbonate
28、prEN 16004, Chemicals used for treatment of water intended for human consumption Magnesium oxide EN ISO 3696:1995, Water for analytical laboratory use Specification and test methods (ISO 3696:1987) ISO 3165, Sampling of chemical products for industrial use Safety in sampling ISO 4793:1980, Laborator
29、y sintered (fritted) filters Porosity grading, classification and designation 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 the
30、analysis of half-burnt dolomite, calcium carbonate, high calcium lime, magnesium oxide and calcium magnesium carbonate and the principle of each method are listed in Table 1. The requirement values for free MgO and free Mg(OH)2in half-burnt dolomite shall be expressed as free MgO in accordance with
31、EN 1017. The same requirement is related to free CaO. The requirement value for MgO in magnesium oxide shall be expressed as MgO in dry substance in accordance with prEN 16004. Therefore, BS EN 12485:2010EN 12485:2010 (E) 5 the analysis of half-burnt dolomite and magnesium oxide shall be performed o
32、n a sample which is bound-water free. Before starting the chemical analysis, the loss on ignition at 450 C shall be determined as described in 6.2. The analysis itself shall be performed on the material obtained after the determination of the loss on ignition. The requirement values for calcium carb
33、onate, hydrated lime and calcium magnesium carbonate shall be expressed in dry substance in accordance with EN 1018, EN 12518 and prEN 16003. Therefore, the analysis of these products shall be performed on a sample which has been dried in accordance with the procedure described in 6.1. For the deter
34、mination of the water-soluble content of high-calcium lime, the method in 6.5 is considered as the reference method. The sugar method described in 6.6 can be used as an alternative method if it is demonstrated that the results obtained with this method are equivalent to those of the reference method
35、. Table 1 Methods for analysis Determination Method Principle Standard Screen oversize 4.1 Air-jet sieving EN 12518 4.2 Wet sieving EN 12518 Free water 6.1 Gravimetry EN 1018, EN 12518, prEN 16003 Loss on ignition at 450 C 6.2 Gravimetry EN 1017, EN 12518, prEN 16004 Carbon dioxide 6.3 Gravimetry EN
36、 1017, EN 12518, prEN 16004 Residue insoluble in hydrochloric acid 6.4 Acidimetry, Gravimetry EN 1018, prEN 16004 Water-soluble calcium oxide or calcium hydroxide 6.5 Acidimetric titration EN 12518 Sugar-soluble calcium oxide or calcium hydroxide 6.6 Acidimetric titration EN 12518 Water-insoluble co
37、nstituents 6.7 Gravimetry EN 12518 Free calcium oxide 6.8 Extraction, acidimetric titration EN 1017, prEN 16004 Calcium oxide and magnesium oxide 6.9 Complexometric titration EN 1017, EN 1018, prEN 16003, prEN 16004 Sulfate 6.10 Gravimetry EN 1017Solubility index 6.11 Conductivity EN 12518 Magnesium
38、 7.1or 7.2 AAS (flame) or ICP-OES EN 1017, EN 1018, prEN 16003, prEN 16004 Silicium, Aluminium, Iron, 7.1 or 7.2 AAS (flame) or ICP-OES EN 1017, EN 12518, prEN 16003, prEN 16004 BS EN 12485:2010EN 12485:2010 (E) 6 Table 1 (continued) Determination Method Principle Standard Manganese 7.2 ICP-OES EN 1
39、2518Sulfur 7.2 ICP-OES EN 1017Lead, Cadmium, Chromium, Nickel 8.1 or 8.2 AAS (flameless) or ICP-OES EN 1017, EN 1018, EN 12518, prEN 16003, prEN 16004 Arsenic, Antimony, Selenium 8.3 AAS (hydride) EN 1017, EN 1018, EN 12518, prEN 16003, prEN 16004 Mercury 8.4 AAS (cold-vapour technique) EN 1017, EN
40、1018, EN 12518, prEN 16003, prEN 16004 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 1 l. Before performing the
41、 chemical 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 s
42、ampling 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
43、absorption 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. 3.4 Reagents All reagents shall be of a recognized analytical grade appropriat
44、e for the method being used. The water used shall conform to grade 3 in accordance with EN ISO 3696:1995 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
45、 liquids used for the reagents in this standard have the following densities () (in grams per millilitre at 20 C): hydrochloric acid 1,16 to 1,19; nitric acid 1,40 to 1,42; ammonium hydroxide solution 0,88 to 0,91; triethanolamine 1,12. Dilutions are specified as the sum of the volumes. Thus, (1 + 2
46、) dilute hydrochloric acid means 1 part by volume of concentrated hydrochloric acid mixed with 2 parts by volume of water. BS EN 12485:2010EN 12485:2010 (E) 7 The concentrations of reference and standard volumetric solutions are specified as amount-of-substance concentrations, c (mol/l), while those
47、 of stock and standard solutions are specified as concentrations by mass, c (g/l or mg/l). Suitable element solutions for atomic absorption spectroscopy (AAS) and for optical emission spectroscopy by inductively coupled plasma (ICP-OES) are commercially available and can be used as stock solutions.
48、They shall be prepared for the purposes of analysis in accordance with the manufacturers instructions. The appropriate element standard solutions are prepared in accordance with the instructions given in this European Standard. This European Standard makes no stipulations relating to the shelf life
49、of stock, standard and reference solutions. In the case of stock solutions having an element concentration of 1 g/l, the manufacturer generally specifies a shelf life of one year. It is advisable to check the calibration solutions regularly. 3.5 Glassware Glass containers and pipettes shall be cleaned with hot dilute nitric acid immediately before use and then ri
