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

IEC 62321-7-2:2017 describes procedures 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 solution 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. The first edition of IEC 62321:2008 was a ‘stand-alone’ standard that included an introduction, an overview of test methods, a mechanical sample preparation 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.

Verfahren zur Bestimmung von bestimmten Substanzen in Produkten der Elektrotechnik - Teil 7-2: Sechswertiges Chrom - Bestimmung von sechswertigem Chrom (Cr(VI)) in Polymeren und Elektronik durch das kolorimetrische Verfahren

Détermination de certaines substances dans les produits électrotechniques - Partie 7-2: Chrome hexavalent - Détermination du chrome hexavalent (Cr(VI)) dans les polymères et les produits électroniques par méthode colorimétrique

l'IEC 62321-7-2:2017 décrit des procédures de mesure quantitative du chrome hexavalent, Cr(VI), dans des échantillons de polymères et de produits électroniques. Cette méthode emploie un solvant organique destiné à dissoudre ou à faire gonfler la matrice de l'échantillon, puis une procédure de digestion alcaline visant à extraire le chrome hexavalent des échantillons. Des études ont démontré que la solution alcaline/organique est plus efficace que la solution acide pour extraire le Cr(VI) d'échantillons solubles et insolubles. La réduction minimale du Cr(VI) en Cr(III) ou l'oxydation du Cr(III) en Cr(VI) se produit en milieu alcalin. La première édition de l'IEC 62321:2008 était une norme "autonome" qui comprenait une introduction, une vue d'ensemble des méthodes d'essai, la préparation mécanique d'échantillon, ainsi que différents articles relatifs à des méthodes d'essai. Cette première édition de l'IEC 62321-7-2 remplace en partie l'IEC 62321:2008, constituant une révision structurelle et remplaçant, en général, l'Annexe C. L'IEC 62321-7-2 remplace définitivement les articles correspondants dans l'IEC 62321:2008.

Določevanje posameznih substanc v elektrotehniških izdelkih - 7-2. del: Šestvalentni krom - Določevanje šestvalentnega kroma (Cr(VI)) v polimerih in elektroniki s kolorimetrično metodo

Ta del IEC 62321 opisuje postopke za količinsko merjenje šestvalentnega kroma (Cr(VI)) v vzorcih polimerov in elektronike. Metoda določa uporabo organskega topila, s katerim se matrica vzorca raztopi ali nabrekne, temu pa sledi postopek alkalnega razklopa za izločanje Cr(VI) iz vzorcev. Študije so pokazale, da je organska/alkalna raztopina učinkovitejša od kisle raztopine pri izločanju Cr(VI) iz topnih in netopnih vzorcev. Minimalna redukcija Cr(VI) v Cr(III) ali oksidacija Cr(III) v Cr(VI) se pojavi pri alkalnih pogojih.
Pri topnih polimerih, sestavljenih iz akrilonitril-butadienstirena (ABS), polikarbonata (PC) in polivinilklorida (PVC), je treba vzorce najprej raztopiti v ustreznem organskem topilu in nato izločiti Cr(VI) z alkalno raztopino za izločanje.
Pri netopnih/neznanih polimerih ali elektronskih materialih, ki ne vsebujejo antimona (Sb), je treba vzorce obdelati v raztopini toluena/alkalni raztopini pri 150–160 °C. Nato je treba ločiti in zavreči organsko fazo v ekstraktih, anorgansko fazo pa ohraniti za analizo Cr(VI).
Koncentracija Cr(VI) v ekstraktu se določi glede na njeno reakcijo v kislih pogojih z 1,5-difenilkarbazidom. Cr(VI) je reduciran v Cr(III) v reakciji z difenilkarbazidom, ki oksidira v difenilkarbazon. Cr(III) in difenilkarbazon v reakciji tvorita rdečevijolični sestav. Raztopina se meri kvantitativno s kolorimetrom ali spektrofotometrom pri 540 nm.

General Information

Status
Published
Publication Date
22-Jun-2017
Withdrawal Date
01-May-2020
Current Stage
6060 - Document made available - Publishing
Start Date
23-Jun-2017
Completion Date
23-Jun-2017

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2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.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 method71.040.50Fizikalnokemijske analitske metodePhysicochemical methods of analysis31.020Elektronske komponente na splošnoElectronic components in general29.020Elektrotehnika na splošnoElectrical engineering in generalICS:Ta slovenski standard je istoveten z:EN 62321-7-2:2017SIST EN 62321-7-2:2017en01-september-2017SIST EN 62321-7-2:2017SLOVENSKI
STANDARDSIST EN 62321:20091DGRPHãþD



SIST EN 62321-7-2:2017



EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
EN 62321-7-2
June 2017 ICS 31.020; 71.040.50
Supersedes
EN 62321:2009 (partially)
English Version
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 (IEC 62321-7-2:2017)
Détermination de certaines substances dans les produits électrotechniques - Partie 7-2: Chrome hexavalent - Détermination du chrome hexavalent (Cr(VI)) dans les polymères et les produits électroniques par méthode colorimétrique (IEC 62321-7-2:2017)
Verfahren zur Bestimmung von bestimmten Substanzen in Produkten der Elektrotechnik - Teil 7-2: Bestimmung von sechswertigem Chrom (Cr(VI)) in Polymeren und Elektronik durch kolorimetrische Verfahren (IEC 62321-7-2:2017) This European Standard was approved by CENELEC on 2017-05-02. CENELEC 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 standards may be obtained on application to the CEN-CENELEC Management Centre or to any CENELEC 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 CENELEC member into its own language and notified to the CEN-CENELEC Management Centre has the same status as the official versions. CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique Europäisches Komitee für Elektrotechnische Normung CEN-CENELEC Management Centre: Avenue Marnix 17,
B-1000 Brussels © 2017 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Ref. No. EN 62321-7-2:2017 E SIST EN 62321-7-2:2017



EN 62321-7-2:2017 2 European foreword The text of document 111/408/CDV, future edition 1 of IEC 62321-7-2, prepared by IEC/TC 111 "Environmental standardization for electrical and electronic products and systems" was submitted to the IEC-CENELEC parallel vote and approved by CENELEC as EN 62321-7-2:2017.
The following dates are fixed: • latest date by which the document has to be implemented at national level by publication of an identical national standard or by endorsement (dop) 2018-02-02 • latest date by which the national standards conflicting with the document have to be withdrawn (dow) 2020-05-02
This document supersedes EN 62321:2009 (partially).
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CENELEC shall not be held responsible for identifying any or all such patent rights. Endorsement notice The text of the International Standard IEC 62321-7-2.2017 was approved by CENELEC as a European Standard without any modification. In the official version, for Bibliography, the following notes have to be added for the standards indicated: IEC 62321:2008 NOTE Harmonized as EN 62321:2009. IEC 62321-2 NOTE Harmonized as EN 62321-2. ISO 648 NOTE Harmonized as EN ISO 648.
SIST EN 62321-7-2:2017



EN 62321-7-2:2017 3
Annex ZA (normative)
Normative references to international publications with their corresponding European publications
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 (including any amendments) applies.
NOTE 1 When an International Publication has been modified by common modifications, indicated by (mod), the relevant EN/HD applies.
NOTE 2 Up-to-date information on the late
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