GB/T 5009.14-2003 Translated English of Chinese Standard. (GBT 5009.14-2003, GB/T5009.14-2003, GBT5009.14-2003): Determination of Zinc in Foodshttps://www.chinesestandard.net, 26 ago 2016 - 11 pagine This Standard specifies the methods for the determination of zinc in foods. This Standard applies to the determination of zinc in foods. The detection limits of this Standard: for atomic absorption method, it is 0.4 mg/kg; for dithizone colorimetry method, it is 2.5 mg/kg. |
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125 mL separating 50 mL volumetric absorption value according to 6.1.1 acetic acid acetic acid-acetate buffer acid 2 mol/L add 1 mL add water ammonia Analysis steps Anti-Epidemic Station arithmetic mean carbon tetrachloride layer carbonize on small content in sample cuvette Determination of Zinc Dithizone Colorimetry dithizone working solution dithizone-carbon tetrachloride solution ethanol extract g to place GB/T Health and Anti-Epidemic ketone linear regression Method methyl orange microgram milliliter mL mixed acid mL of hydrochloric mL of zinc mL separating funnels mL volumetric flask muffle furnace phenol red phosphoric acid place into 125 porcelain crucible reagent blank solution responsibly drafted sample digestive juice scale mark separating funnels respectively small fire sodium acetate Sodium thiosulfate solution solution 0.1 g/L solution 250 g/L solution is equivalent Standard was responsibly standard working solution starting from transfer tetrachloride solution 0.1 thiosulfate solution 250 water to dilute zinc content Zinc in Foods zinc standard solution