GB 1903.9-2015: Translated English of Chinese Standard. GB1903.9-2015: National food safety standard - Food nutrition enhancer - Sodium selenite
https://www.chinesestandard.net, 2018 M03 30 - 13 pages
This standard applies to the food nutrition enhancer sodium selenite which is manufactured using the raw materials of selenous acid and sodium hydroxide.
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acetic acid acid standard titration ADD 5 mL ADD water Ammonium thiocyanate Analytical procedures WEIGH Appendix boiled cold water cesium chloride Chemical formula cobalt chloride solution concentrated hydrochloric acid content dry basis Conversion factor copper sulfate solution Determination of solution EDTA g of potassium g of specimen GB/T hydrochloric acid solution hydrochloric acid standard mL Nessler colorimetric mL of boiling mL of hydrochloric mL of sodium mL of water Nessler colorimetric tube newly boiled cold nitric acid solution Physiochemical indicators potassium iodide Preparation of standard Preparation of turbidity Reagents and materials selenite content dry Selenium Sensory requirements SHAKE it uniformly silver nitrate sodium acetate Sodium selenite content sodium thiosulfate standard solution clarity solutions of various standard stock solution standard titration solution Starch indicator solution Table A.2 thiosulfate standard titration thymolphthalein titration solution consumed turbidity standard solution volume to 1000 water to dilute water to dissolve WEIGH 2.0 g xylenol orange