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See Chinese contents: GB 31604.42-2016 GB 31604.42-2016: Method for analysis of hygienic standard of rubber sheet (ring) for food use
This Standard specifies the flame atomic absorption spectrometry, inductively coupled plasma atomic emission spectrometry, inductively coupled plasma mass spectrometry, and dithizone colorimetry for the determination of zinc migration quantity in food contact materials and their products after immersed in food simulant.
