GB/T 39560.702-2021
Determination of certain substances in electrical and electronic products—Part 7-2:Hexavalent chrome—Determination of hexavalent chrome[Cr(VI)]in polymers and electronics by the colormetric method (English Version)

Standard No.

GB/T 39560.702-2021

Language

Chinese, Available in English version

Release Date

2021

Published By

国家市场监督管理总局、中国国家标准化管理委员会

Latest

GB/T 39560.702-2021

Scope

This part of GB/T 39560 specifies the method for the quantitative detection of hexavalent chromium [Cr(Ⅵ)] in polymer and electronic parts samples. The determination method in this part uses an organic solvent to dissolve or swell the sample matrix, and then uses an alkaline digestion procedure to extract hexavalent chromium from the sample. Studies have shown that organic/alkaline solutions are more effective than acidic solutions for the extraction of hexavalent chromium from soluble and insoluble samples. Under alkaline solution conditions, the degree of reduction of hexavalent chromium to trivalent chromium or oxidation of trivalent chromium to hexavalent chromium is the least. For soluble polymer samples composed of ABS (acrylonitrile-butadiene-styrene), PC (polycarbonate) and PVC (polyvinyl chloride), the sample should first be dissolved with an appropriate organic solvent, and then alkaline Extraction solution to extract hexavalent chromium. For insoluble or unknown polymers or electronic materials that do not contain antimony (Sb), the sample is first digested in toluene/alkaline solution at 150 °C to 160 °C, and then the organic phase in the extract is separated and separated. Discard and save the inorganic phase for hexavalent chromium analysis. The concentration of hexavalent chromium in the extract was determined by reacting the extract with 1,5-diphenylcarbazide under acidic conditions. During the reaction with diphenylcarbazide, hexavalent chromium is reduced to trivalent chromium, and diphenylcarbazide is oxidized to diphenylcarbazone. Then trivalent chromium and diphenylcarbazone react further to form a purple-red compound. Then use a colorimeter or a spectrophotometer to quantitatively measure the purple-red compound solution at 540nm.

GB/T 39560.702-2021 Referenced Document

• IEC 62321-1 Determination of certain substances in electrotechnical products .Part 1: Introduction and overview
• ISO 3696 Water for analytical laboratory use; Specification and test methods

GB/T 39560.702-2021 history

• 2021 GB/T 39560.702-2021 Determination of certain substances in electrical and electronic products—Part 7-2:Hexavalent chrome—Determination of hexavalent chrome[Cr(VI)]in polymers and electronics by the colormetric method

GB/T 39560.702-2021 -All Parts