1. Vitamin A: It is light brown or grayish yellow particles by the naked eye. The sample was taken as 0.1 g, and it was dissolved by wet grinding with absolute ethanol. 10 ml of chloroform was added, and 0.5 ml of a chloroform solution of antimony trichloride was added. The solution first appeared blue and immediately faded, which was the real product.
2, vitamin E powder: the appearance of white or light yellow powder. Take 15 mg of the sample, add 10 ml of absolute ethanol to dissolve it, add 2 ml of nitric acid, shake and heat for 15 minutes, dissolve the orange-red color to be genuine.
3, sodium selenite vitamin E powder: the appearance of white or off-white powder, take 0.5 grams of sample, add 30 drops of ethanol, shake the filter, add 5 drops of nitric acid in the filtrate, heating into a red square for authentic.
4, vitamin K3: the appearance of white or gray-yellow brown crystal powder. Take 0.1 g of the sample, add 10 ml of water to dissolve, and add 3 ml of sodium carbonate solution to produce a fresh yellow precipitate.
5, vitamin B1: the appearance of white crystal or crystalline powder, slightly odor, slightly bitter. Take 0.1 g of the sample, shake it with a little water, filter, add 3 drops of iodine reagent to the filtrate, and form a brown-red precipitate.
6, vitamin B2: the appearance of yellow to orange-yellow crystalline powder, bitter smell, take 0.5 grams of sample, add a little water to dissolve, extract the supernatant, add 2 drops of dilute hydrochloric acid or sodium hydroxide test solution, yellow in the supernatant Fluorescence disappears.
7. Trace element potassium iodide: Take 0.5 g of sample and dissolve it with 5 ml of water. Then, 1 ml of hydrochloric acid solution was added in a ratio of 1:1, and after adding 1 ml of the starch solution, the solution was blue.
8. Potassium iodate: Take 1 gram of the sample in a test tube, then add 2 ml of sulfuric acid. After 10-15 minutes, gas formation is observed.
9. Ferrous sulfate: Take 0.1 g of sample, dissolve it in 10 ml of water, add 2-3 drops of 10% iron potassium chloride solution to form a deep blue precipitate, add a few drops of dilute hydrochloric acid, and the precipitate is not easily dissolved.
10. Magnesium sulphate: Take 1 gram of sample, dissolve it in 10 ml of water, add a white precipitate of ammonia water, and dissolve it by adding an appropriate amount of ammonium chloride. A 5% sodium hydrogen phosphate solution was added, and a white precipitate formed, which did not dissolve after the addition of aqueous ammonia.
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