BS EN 62321-7-2:2017 - Determination of certain substances in electrotechnical products. Hexavalent chromium. Determination of hexavalent chromium (Cr(VI)) in polymers and electronics by the colorimetric method

BS EN 62321-7-2:2017

Determination of certain substances in electrotechnical products. Hexavalent chromium. Determination of hexavalent chromium (Cr(VI)) in polymers and electronics by the colorimetric method

Status : Current   Published : August 2017

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This part of IEC 62321 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.

For soluble polymers consisting of ABS (Acrylonitrile- butadiene-styrene), PC (Polycarbonate) 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; the inorganic phase is retained for Cr(VI) analysis.

The Cr(VI) concentration in the extract is determined by its reaction under acidic conditions with 1,5-diphenylcarbazide. Cr(VI) is reduced to Cr(III) in the reaction with diphenylcarbazide which is oxidized to diphenylcarbazone. The Cr(III) and diphenylcarbazone form a red-violet-coloured complex in the reaction. The complex solution is measured quantitatively by a colorimeter or a spectrophotometer at 540 nm.




Standard NumberBS EN 62321-7-2:2017
TitleDetermination of certain substances in electrotechnical products. Hexavalent chromium. Determination of hexavalent chromium (Cr(VI)) in polymers and electronics by the colorimetric method
StatusCurrent
Publication Date18 August 2017
Normative References(Required to achieve compliance to this standard)IEC 62321-1:2013, EN ISO 3696, ISO 3696:1987, EN 62321-1:2013
Informative References(Provided for Information)EN ISO 648, EN 62321-2, EN 62321:2009, IEC 62321:2008, IEC 62321-5:2013, ASTM E1272 - 02(2012), ISO 648:2008
ReplacesBS EN 62321:2009
International RelationshipsEN 62321-7-2:2017,IEC 62321-7-2:2017
Amended ByCorrigendum, June 2020
DescriptorsMercury, Electrical equipment, Cadmium, Chromium, Electronic equipment and components, Lead, Electrical components, Dangerous materials, Determination of content, Environmental engineering, Flame retardants, Biphenyl, Chemical analysis and testing
ICS31.020
71.040.50
Title in FrenchDétermination de certaines substances dans les produits électrotechniques Chrome hexavalent. Détermination du chrome hexavalent (Cr(VI)) dans les polymères et les produits électroniques par méthode colorimétrique
Title in GermanVerfahren zur Bestimmung von bestimmten Substanzen in Produkten der Elektrotechnik Bestimmung von sechswertigem Chrom (Cr(VI)) in Polymeren und Elektronik durch kolorimetrische Verfahren
CommitteeGEL/111
ISBN978 0 539 14214 3
PublisherBSI
FormatA4
DeliveryYes
Pages24
File Size1.34 MB
Price£182.00


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