GB 31604.42-2016: Translated English of Chinese Standard. GB31604.42-2016: National standard for food safety - Determination of zinc migration quantity in food contact materials and products
https://www.chinesestandard.net, 14/10/2017 - 13 páginas
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.
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000mL volumetric flask 5mL of nitric acetate buffer solution acid solution 2mol/L ADD water ammonia amount of nitric analysis of hygienic Analytical balance arithmetic mean atomic absorption spectrometry carbon tetrachloride layer carbon tetrachloride solution colorimetry concentration of zinc coupled plasma atomic determination of zinc DETERMINE the absorbance dilute to 100mL DISCARD the carbon DRAW 5mL Ethanol flame atomic absorption food contact materials food simulant test Glacial acetic acid Hydrochloric acid hygienic standard inductively coupled plasma materials and products Method for analysis MIX evenly nitric acid solution orange indicator 2g/L plasma atomic emission provisions of GB quantity in food Reagents and materials sample soaking solution separating funnel simulant test solution Sodium acetate standard curve standard series standard stock solution Standard substance tetrachloride solution 0.1g/L tetrachloride to adjust tetrachloride working solution thiosulfate solution 250g/L water to dilute WEIGH 500mL zinc in food zinc migration quantity Zinc oxide zinc standard solution Zinc standard stock