QC/T 942-2021 Translated English of Chinese Standard (QC/T942-2021, QCT 942-2021): Test methods of hexavalent chromium in automotive materials
https://www.chinesestandard.net, 2022 M08 21 - 56 pages
This document specifies the terms and definitions of hexavalent chromium detection in automotive materials, X-ray fluorescence spectroscopy, qualitative test of hexavalent chromium in metal anti-corrosion plating, determination of hexavalent chromium content in metal anti-corrosion plating, determination of hexavalent chromium in polymer materials and electronic materials, determination of hexavalent chromium content in leather materials (colorimetric method), determination of hexavalent chromium content in leather materials (chromatographic method), test reports, etc. This document applies to qualitative and quantitative testing of hexavalent chromium, in automotive materials.
Determination of hexavalent chromium content in polymer materials and electronic
Determination of hexavalent chromium content in leather materials chromatographic
Normative Determination of volatile content in leather materials
25 mL volumetric according to formula acetone Adjust the pH ammonium sulfate analysis arithmetic mean bolts buffer solution calculated according calculation result calibration curve chromatogram chromatography chromium element chromium standard solution chromium stock solution color developing solution colorimeter column concentration content in leather content of hexavalent deionized water Determination of hexavalent digestion solution digestion vessel dilute Dissolve ethanol filter hexavalent chromium content hexavalent chromium standard hexavalent chromium stock industry standards least two significant leather materials metal anti-corrosion plating micrograms milliliters mL of color mL of phosphoric mL volumetric flask mmol Mobile phase national standard solution phosphoric acid Pipette polymer Potassium dichromate pure and distilled QC/T quantitative reagents confirmed result must retain retain at least sample solution significant figures sodium hydroxide solution see 8.2.5 spiked recovery rate square millimeters mm2 substrate sulfuric acid surface area test result trivalent chromium value is expressed volume reach X-ray fluorescence spectroscopy µg/mL