GB 31604.25-2016: Translated English of Chinese Standard. GB31604.25-2016: National standard for food safety - Determination of chromium migration quantity in food contact materials and products
https://www.chinesestandard.net, 2017 M10 14 - 13 pages
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.
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100mL volumetric 500mL volumetric flask Acetone acid solution 2.5mol/L ADD 2mL ADD water ammonium dihydrogen phosphate Analytical balance arithmetic mean atomic emission spectrometry chromium in food chromium migration quantity Chromium standard solution Chromium standard stock concentration of chromium corresponding food simulant coupled plasma atomic coupled plasma mass determination of chromium dihydrogen phosphate solution diphenylcarbazide solution DISSOLVE in water food contact materials food simulant test furnace atomic absorption Graphite furnace atomic Inductively coupled plasma LET it stand materials and products MIX evenly nitric acid solution nitrite solution 100g/L permanganate solution 3g/L phosphate solution 20g/L plasma atomic emission plasma mass spectrometry potassium permanganate solution provisions of GB pyrophosphate solution 50g/L quantity in food reagents and water reddish color disappears sample soaking solution saturated sodium hydroxide series for quantitation simulant test solution sodium nitrite solution sodium pyrophosphate solution standard curve standard series solution standard stock solution sulfuric acid solution urea solution 200g/L volume of 100mL