1、BRITISH STANDARDBS EN ISO 23631:2006Incorporating corrigendum no. 1Water quality Determination of dalapon, trichloroacetic acid and selected haloacetic acids Method using gas chromatography (GC-ECD and/or GC-MS detection) after liquid-liquid extraction and derivatizationThe European Standard EN ISO
2、23631:2006 has the status of a British StandardICS 13.060.50g49g50g3g38g50g51g60g44g49g42g3g58g44g55g43g50g56g55g3g37g54g44g3g51g40g53g48g44g54g54g44g50g49g3g40g59g38g40g51g55g3g36g54g3g51g40g53g48g44g55g55g40g39g3g37g60g3g38g50g51g60g53g44g42g43g55g3g47g36g58BS EN ISO 23631:2006This British Standar
3、d was published under the authority of the Standards Policy and Strategy Committee on 31 March 2006 BSI 2007ISBN 0 580 47994 3National forewordThis British Standard was published by BSI. It is the UK implementation of EN ISO 23631:2006, incorporating corrigendum February 2007. It is identical with I
4、SO 23631:2006.The UK participation in its preparation was entrusted by Technical Committee EH/3, Water quality, to Subcommittee EH/3/2, Physical, chemical and biochemical methods.A list of organizations represented on this subcommittee can be obtained on request to its secretary.This publication doe
5、s not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. Compliance with a British Standard cannot confer immunity from legal obligations.Amendments issued since publicationAmd. No. Date Comments17048 Corrigendum No. 130 March 2007 Addit
6、ion of Annex ZAEUROPEAN STANDARDNORME EUROPENNEEUROPISCHE NORMEN ISO 23631February 2006ICS 13.060.50 Incorporating corrigendum February 2007English VersionWater quality - Determination of dalapon, trichloroacetic acidand selected haloacetic acids - Method using gaschromatography (GC-ECD and/or GC-MS
7、 detection) after liquid-liquid extraction and derivatization (ISO 23631:2006)Qualit de leau - Dosage du dalapon, de lacidetrichloroactique et dacides haloactiques selectionns -Mthode par chromatographie en phase gazeuse(dtection CG-DCE et/ou CG-SM) aprs extraction liquide-liquide et drivatisation (
8、ISO 23631:2006)Wasserbeschaffenheit - Bestimmung von Dalapon,Trichloressigsure und ausgewhlten Halogenessigsuren- Verfahren mittels Gaschromatographie (GC-ECDund/oder GC-MS-Detektion) nach Flssig-Flssig-Extraktion und Derivatisierung (ISO 23631:2006)This European Standard was approved by CEN on 16 J
9、anuary 2006.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 obt
10、ained on application to the Central Secretariat 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 Central Secre
11、tariat has the same status as the officialversions.CEN members are the national standards bodies of Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France,Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portug
12、al, Romania,Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMIT EUROPEN DE NORMALISATIONEUROPISCHES KOMITEE FR NORMUNGManagement Centre: rue de Stassart, 36 B-1050 Brussels 2006 CEN All rights of exploitation in any form and by any means rese
13、rvedworldwide for CEN national Members.Ref. No. EN ISO 23631:2006: EForeword This document (EN ISO 23631:2006) has been prepared by Technical Committee ISO/TC 147 “Water quality“ in collaboration with Technical Committee CEN/TC 230 “Water analysis“, the secretariat of which is held by DIN. This Euro
14、pean Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by August 2006, and conflicting national standards shall be withdrawn at the latest by August 2006. According to the CEN/CENELEC Internal Regulations, the natio
15、nal standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Por
16、tugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. Endorsement notice The text of ISO 23631:2006 has been approved by CEN as EN ISO 23631:2006 without any modifications. EN ISO 23631:2006Reference numberISO 23631:2006(E)INTERNATIONAL STANDARD ISO23631First edition2006
17、-02-01Water quality Determination of dalapon, trichloroacetic acid and selected haloacetic acids Method using gas chromatography (GC-ECD and/or GC-MS detection) after liquid-liquid extraction and derivatization Qualit de leau Dosage du dalapon, de lacide trichloroactique et dacides haloactiques slec
18、tionns Mthode par chromatographie en phase gazeuse (dtection CG-DCE et/ou CG-SM) aprs extraction liquide-liquide et drivatisation EN ISO 23631:2006ii iiiContents Page Foreword iv Introduction v 1 Scope . 1 2 Normative references . 2 3 Principle. 2 4 Interferences . 2 5 Reagents 2 6 Apparatus 5 7 Sam
19、pling and sample pre-treatment. 7 8 Procedure 7 9 Calibration . 10 10 Calculation. 13 11 Expression of results . 14 12 Test report . 15 Annex A (informative) Examples of gas chromatograms 16 Annex B (informative) Mass spectra of methylated dalapon and haloacetic acids. 19 Annex C (informative) Preci
20、sion data. 23 Bibliography . 24 EN ISO 23631:2006Annex ZA (informative) A-deviations . 25 iv Foreword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standards is normally carried
21、 out through ISO technical committees. Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committee. International organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. ISO
22、 collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2. The main task of technical committees is to prepare Internation
23、al Standards. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote. Attention is drawn to the possibility that some of the elem
24、ents of this document may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights. ISO 23631 was prepared by Technical Committee ISO/TC 147, Water quality, Subcommittee SC 2, Physical, chemical and biochemical methods. EN ISO 23631:2006vIntrod
25、uction The user should be aware the particular problems could require the specifications of additional marginal conditions. EN ISO 23631:2006blank1Water quality Determination of dalapon, trichloroacetic acid and selected haloacetic acids Method using gas chromatography (GC-ECD and/or GC-MS detection
26、) after liquid-liquid extraction and derivatization WARNING Persons using this International Standard should be familiar with normal laboratory practice. This International Standard does not purport to address all of the safety problems, if any, associated with its use. It is the responsibility of t
27、he user to establish appropriate safety and health practices and to ensure compliance with any national regulatory conditions. Diazomethane is explosive, extremely toxic and severely irritating, causing pulmonary oedema when inhaled in high concentrations. Long-term, low-level exposure may lead to s
28、ensitization, resulting in asthma-like symptoms. Also, diazomethane and several of its chemical precursors have been cited as carcinogens. IMPORTANT It is absolutely essential that tests conducted according to this International Standard be carried out by suitably trained staff. 1 Scope This Interna
29、tional Standard specifies a method for the determination of dalapon, trichloroacetic acid (TCA) and selected haloacetic acids (see Table 1) in ground water and drinking water by gas chromatography (GC-ECD and/or GC-MS detection) after liquid-liquid-extraction and derivatization using diazomethane. D
30、epending on the matrix, the method is applicable to a concentration range from 0,5 g/l to 10 g/l. The validated reporting limit of TCA and dalapon is about 0,05 g/l (see Table C.1). Detection by electron-capture detector (ECD) in general leads to lower detection limits. Detection by mass spectrometr
31、y (MS) allows analyte identification. This method may be applicable as well to compounds not mentioned in Table 1 or to other types of water. However, it is necessary to verify the applicability of this method for these special cases. Table 1 Haloacetic acids determined by this method Name Molecular
32、 formula Relative molecular mass CAS registry No. Bromochloroacetic acid C2H2BrClO2173,4 5589-96-8 Dalapon aC3H4Cl2O2143,0 75-99-0 Dibromoacetic acid C2H2Br2O2217,8 631-64-1 Dichloroacetic acid C2H2Cl2O2128,9 79-43-6 Monobromoacetic acid C2H3BrO2138,9 79-08-3 Monochloroacetic acid C2H3ClO294,5 79-11
33、-8 Trichloroacetic acid (TCA) C2HCl3O2163,4 76-03-9 a2,2-Dichloropropionic acid. EN ISO 23631:20062 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the late
34、st edition of the referenced document (including any amendments) applies. ISO 3696:1987, Water for analytical laboratory use Specification and test methods ISO 5667-1, Water quality Sampling Part 1: Guidance on the design of sampling programmes ISO 5667-2, Water quality Sampling Part 2: Guidance on
35、sampling techniques ISO 5667-3, Water quality Sampling Part 3: Guidance on the preservation and handling of water samples 3 Principle Dalapon, trichloroacetic acid (TCA) and selected haloacetic acids are extracted from the acidified water sample with methyl-tert-butyl ether (MTBE). The extract is co
36、ncentrated by evaporation. The analytes are methylated using diazomethane. The methylated analytes are separated, identified and quantified by means of capillary gas chromatography with electron-capture detection (GC-ECD) and/or mass spectrometry (GC-MS). 4 Interferences 4.1 Interferences with the e
37、xtraction procedure Suspended particles in the water may interfere with the liquid-liquid-extraction procedure causing problems in layer separation. In this case, filter the water sample through a glass fibre filter (6.15) prior to enrichment. 4.2 Interferences with the gas chromatography and mass s
38、pectrometry procedure Interferences may be caused e.g. by the injection system used or by inadequate separation of the analytes. Experienced operators, using the information given in the instrument manuals, may be able to minimize this type of interference. Regular checking of the chromatographic an
39、d spectrometric system is required to maintain adequate performance. Required system stability should be checked regularly by the use of a GC-standard. Insufficiently purified solvents (5.6) as well as insufficiently purified sodium chloride (5.10) may cause severe interferences. Reagents used in th
40、e method to perform derivatization may lead to interferences in the ECD-chromatograms. Therefore, it is highly recommended that temperatures of the diazomethane building process be carefully kept in limits (see 5.19). 5 Reagents Use solvents and reagents of sufficient purity, i.e. with negligibly lo
41、w impurities compared with the concentration of analytes to be determined. As reagents use, as far as available, “residual grade” or better in order to obtain clean blanks. Check blanks regularly and establish proper charge control. 5.1 Water, complying to grade 1 as defined in ISO 3696:1987, or equ
42、ivalent. EN ISO 23631:200635.2 Operating gases for the gas chromatography/mass spectrometry, of high purity and in accordance with manufacturers specifications. 5.3 Nitrogen, of high purity, i.e. minimum 99,996 % by volume, for concentration by evaporation. 5.4 Diethyl ether, C4H10O. NOTE Stabilizer
43、s may cause interferences. 5.5 Ethanol, C2H5OH. 5.6 Solvents, e.g. ethyl acetate, C4H8O2; acetone, C3H6O. 5.7 Methyl-tert-butyl ether (MTBE), C5H12O. 5.8 Benzoic acid, dissolved in ethanol, c(C7H6O2) 0,2 mol/l. 5.9 N-methyl-N-nitroso-4-toluenesulfonamide, C8H10N2O3S. 5.10 Sodium chloride, NaCl (e.g.
44、 heated at 550 C for 4 h). 5.11 Potassium hydroxide solution, w(KOH) 60 %. 5.12 Sodium hydroxide solution, c(NaOH) 0,1 mol/l. 5.13 Sodium thiosulfate pentahydrate, Na2S2O35 H2O. 5.14 Phenolphthalein, C20H14O4. 5.15 Acetic acid, w(CH3COOH) 10 %. 5.16 Mineral acid, e.g. hydrochloric acid, w(HCl) 25 %.
45、 5.17 Methylated reference substances. Methylated reference substances (methyl esters of the acids listed in Table 1) of defined concentration suitable for the preparation of reference solutions for gas chromatography (9.2). 5.17.1 Stock solutions of individual methylated reference substances. As an
46、 example, pipette 50 mg of each of the methylated reference substances into 100 ml volumetric flasks, dissolve in MTBE (5.7) and dilute to volume with MTBE. Store stock solutions at about 18 C, protected from light. They are stable for about 1 year. 5.17.2 Multiple-substance stock solutions of methy
47、lated reference substances. As an example, transfer 2 ml of each of the solution of the individual substance (5.17.1) into a 100 ml volumetric flask and dilute to volume with MTBE (5.7). Store stock solutions at about 18 C, protected from light. They are stable for about 1 year. 5.17.3 Reference sol
48、utions of methylated reference substances. Solutions of defined concentration suitable for multipoint calibration (working solution for gas chromatography). Prepare the reference solutions by an adequate dilution of the stock solution (5.17.2) with MTBE (5.7). Store reference solutions at a maximum
49、of 10 C or below (e.g. in a refrigerator), protected from light. They are stable for about 6 months. EN ISO 23631:20064 5.18 Non-methylated reference substances. 5.18.1 General requirements. Reference substances (acids, listed in Table 1) of defined concentration, suitable for the preparation of reference solutions used for spiking water samples. Spike samples for calibration of the total procedure (9.3 and 9.4) and calculation of the overall recovery, i.e. total of extraction recovery and reco
