1、 IEC 62321-7-2 Edition 1.0 2017-03 INTERNATIONAL STANDARD NORME INTERNATIONALE Determination of certain substances in electrotechnical products Part 7-2: Hexavalent chromium Determination of hexavalent chromium (Cr(VI) in polymers and electronics by the colorimetric method Dtermination de certaines
2、substances dans les produits lectrotechniques Partie 7-2: Chrome hexavalent Dtermination du chrome hexavalent (Cr(VI) dans les polymres et les produits lectroniques par mthode colorimtrique IEC 62321-7-2:2017-03(en-fr) THIS PUBLICATION IS COPYRIGHT PROTECTED Copyright 2017 IEC, Geneva, Switzerland A
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20、.ch. IEC 62321-7-2 Edition 1.0 2017-03 INTERNATIONAL STANDARD NORME INTERNATIONALE Determination of certain substances in electrotechnical products Part 7-2: Hexavalent chromium Determination of hexavalent chromium (Cr(VI) in polymers and electronics by the colorimetric method Dtermination de certai
21、nes substances dans les produits lectrotechniques Partie 7-2: Chrome hexavalent Dtermination du chrome hexavalent (Cr(VI) dans les polymres et les produits lectroniques par mthode colorimtrique INTERNATIONAL ELECTROTECHNICAL COMMISSION COMMISSION ELECTROTECHNIQUE INTERNATIONALE ICS 31.020; 71.040.50
22、 ISBN 978-2-8322-4085-4 Registered trademark of the International Electrotechnical Commission Marque dpose de la Commission Electrotechnique Internationale Warning! Make sure that you obtained this publication from an authorized distributor. Attention! Veuillez vous assurer que vous avez obtenu cett
23、e publication via un distributeur agr. 2 IEC 62321-7-2:2017 IEC 2017 CONTENTS FOREWORD . 3 INTRODUCTION . 5 1 Scope 6 2 Normative references 6 3 Terms, definitions and abbreviated terms 6 3.1 Terms and definitions 6 3.2 Abbreviated terms . 7 4 Reagents . 7 4.1 General . 7 4.2 Reagents 7 5 Apparatus
24、8 5.1 General . 8 5.2 Apparatus . 8 6 Sampling . 9 7 Test procedure 9 7.1 Extraction of Cr(VI) in soluble polymers ABS, PC and PVC matrixes 9 7.2 Extraction of Cr(VI) in insoluble/unknown polymers and electronics without Sb . 10 8 Calibration . 11 8.1 Permanent calibration instruments 11 8.2 Traditi
25、onal calibration instruments 11 8.2.1 General . 11 9 Calculation 12 10 Precision . 13 11 Quality assurance and control . 14 11.1 General method 14 11.2 Matrix spike recovery correction method . 14 12 Limits of detection (LOD) and limits of quantification (LOQ) . 14 12.1 General . 14 12.2 Determinati
26、on of LOD and LOQ 15 13 Test report . 16 Bibliography 17 Table 1 Statistical data of all IIS trails 13 Table 2 Method detection limit = t s n116 IEC 62321-7-2:2017 IEC 2017 3 INTERNATIONAL ELECTROTECHNICAL COMMISSION _ DETERMINATION OF CERTAIN SUBSTANCES IN ELECTROTECHNICAL PRODUCTS Part 7-2: Hexava
27、lent chromium Determination of hexavalent chromium (Cr(VI) in polymers and electronics by the colorimetric method FOREWORD 1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising all national electrotechnical committees (IEC National Committe
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38、 Standard IEC 62321-7-2 has been prepared by IEC technical committee 111: Environmental standardization for electrical and electronic products and systems. The first edition of IEC 62321:2008 was a stand-alone standard that included an introduction, an overview of test methods, a mechanical sample p
39、reparation as well as various test method clauses. This first edition of IEC 62321-7-2 is a partial replacement of IEC 62321:2008, forming a structural revision and generally replacing Annex C. IEC 62321-7-2 is the final replacement part of the corresponding clauses in IEC 62321:2008. 4 IEC 62321-7-
40、2:2017 IEC 2017 The text of this standard is based on the following documents: CDV Report on voting 111/408/CDV 111/432/RVC Full information on the voting for the approval of this International Standard can be found in the report on voting indicated in the above table. This document has been drafted
41、 in accordance with the ISO/IEC Directives, Part 2. A list of all parts in the IEC 62321 series, published under the general title Determination of certain substances in electrotechnical products, can be found on the IEC website. The committee has decided that the contents of this document will rema
42、in unchanged until the stability date indicated on the IEC website under “http:/webstore.iec.ch“ in the data related to the specific document. At this date, the document will be reconfirmed, withdrawn, replaced by a revised edition, or amended. IEC 62321-7-2:2017 IEC 2017 5 INTRODUCTION The widespre
43、ad use of electrotechnical products has drawn increased attention to their impact on the environment. In many countries all over the world this has resulted in the adaptation of regulations affecting wastes, substances and energy use of electrotechnical products. The use of hexavalent chromium in el
44、ectrotechnical products is of concern in many regions of the world. The purpose of this document is therefore to provide test methods that will allow the electrotechnical industry to determine the levels of hexavalent chromium in electrotechnical products on a consistent global basis. WARNING Person
45、s using this document should be familiar with normal laboratory practice. This document does not purport to address all of the safety problems, if any, associated with its use. It is the responsibility of the user to establish appropriate safety and health practices and to ensure compliance with any
46、 national regulatory conditions. 6 IEC 62321-7-2:2017 IEC 2017 DETERMINATION OF CERTAIN SUBSTANCES IN ELECTROTECHNICAL PRODUCTS Part 7-2: Hexavalent chromium Determination of hexavalent chromium (Cr(VI) in polymers and electronics by the colorimetric method 1 Scope This part of IEC 62321 describes p
47、rocedures to measure hexavalent chromium, Cr(VI), quantitatively in samples of polymers and electronics. This method employs organic solvent to dissolve or swell the sample matrix, followed by an alkaline digestion procedure to extract Cr(VI) from samples. Studies have shown that organic/alkaline so
48、lution is more effective than acidic solution in extracting Cr(VI) from soluble and insoluble samples. Minimal reduction of Cr(VI) to Cr(III) or oxidation of Cr(III) to Cr(VI) occurs under alkaline conditions. For soluble polymers consisting of ABS (Acrylonitrile- butadiene-styrene), PC (Polycarbona
49、te) and PVC (poly(vinyl chloride), the samples are first dissolved in an appropriate organic solvent and Cr(VI) is then extracted by an alkaline extraction solution. For insoluble/unknown polymers, or electronic materials that do not contain antimony (Sb), the samples are digested in a toluene/alkaline solution at 150 C to 160 C. Then the organic phase in the extracts are separated and discarded
