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See Chinese contents: GB 31604.25-2016 GB 31604.25-2016: Method for analysis of hygienic standard of polytetrafluorethylene coating for inner wall of food container
This Standard specifies the graphite furnace atomic absorption spectrometry, inductively coupled plasma mass spectrometry, inductively coupled plasma atomic emission spectrometry, and diphenylcarbazide colorimetry for the determination of chromium migration quantity in food contact materials and their products after immersed in food simulant.
