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About This Item
Full Description
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-violetcoloured complex in the reaction. The complex solution is measured quantitatively by a colorimeter or a spectrophotometer at 540 nm.
Cross References:
IEC 62321-1:2013
ISO 3696:1987
EN ISO 3696
EN 62321-1 (IEC 62321-1:2013) AS
EN 62321-2
EN 62321:2009
EN ISO 648
ISO 648:2008
IEC 62321-5:2013
IEC 62321:2008
ASTM E1272 - 02(2012)
Replaces BS EN 62321:2009 which remains current.
All current amendments available at time of purchase are included with the purchase of this document.
Document History
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BS EN 62321-7-2:2017
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Determination of certain substances in electrotechnical products-Hexavalent chromium. Determination of hexavalent chromium (Cr(VI)) in polymers and electronics by the colorimetric method- Most Recent
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BS EN 62321:2009
Electrotechnical products. Determination of levels of six regulated substances (lead, mercury, cadmium, hexavalent chromium, polybrominated biphenyls, polybrominated diphenyl ethers)- Historical Version