QC/T 942-2013: Translated English of Chinese Standard. (QCT 942-2013, QC/T942-2013, QCT942-2013): Test methods of hexavalent chromium in automobiles materials
https://www.chinesestandard.net, 17 thg 1, 2017 - 43 trang
This standard specifies the methods for the determination of hexavalent chromium in automobile parts and materials, wherein: X-ray fluorescence spectrometry is applicable to the use of X-ray fluorescence spectroscopy screening and rapid determination of hexavalent chromium content in the automobiles materials.
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Qualitative test of hexavalent chromium in metallic anticorrosive coating
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100 mL volumetric 25 mL volumetric absorbance at 540 absorption vessel analysis automobiles materials boiling water extraction buffer solution 7.2.5 calibration curve Chromate conversion coatings chromium element chromium in automobile chromium in metallic chromium standard solution coloring solution concentration of hexavalent contain hexavalent chromium Determination of hexavalent Determination of recovery DILUTE drip test excellent grade pure expressed in mass filter hexavalent chromium content hexavalent chromium standard industry standard kilograms mg/kg mass fraction measure the absorbance metallic anticorrosive coatings milligrams milligrams per kilograms MIX it uniformly mL of coloring mL of water mL volumetric flask Number phosphate buffer solution phosphoric acid PIPETTE place the sample polybrominated biphenyls polymer potassium dihydrogen phosphate QC/T recovery rate Sample preparation sample surface sodium dihydrogen phosphate solid phase extraction spectrometer spectrophotometer 4.3.3 standard solution 4.2.7 standards are published sulfuric acid temperature test results test solution water extraction method X-ray fluorescence spectrometry X-ray fluorescence spectroscopy