1, vitamin A: the naked eye to see light brown or gray-yellow particles. The sample was taken as 0.1 g, wetted with absolute ethyl alcohol to dissolve it, 10 ml of chloroform was added, and 0.5 ml of a solution of antimony trichloride in chloroform was added. The solution was blue in color and immediately faded, and was the genuine product.
2, vitamin E powder: 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, and dissolve orange-red.
3, sodium selenite vitamin E powder: the appearance of white or almost white powder, take a sample of 0.5 grams, add 30 drops of ethanol, shake the filter, add 5 drops of nitric acid in the filtrate, heating into a red square for the authentic.
4. Vitamin K3: The appearance of white or gray tan crystalline powder. Take 0.1 g of sample, add 10 ml of water to dissolve, and add 3 ml of sodium carbonate solution to produce genuine yellow precipitate.
5, vitamin B1: appearance of white crystal or crystalline powder, slightly odor, slightly bitter. Take a sample of 0.1g, add a little water and shake, filter, add 3 drops of iodine reagent in the filtrate, brown red precipitate.
6. Vitamin B2: Appearance is yellow to orange-yellow crystalline powder with bitter odor. Take a sample of 0.5g, add a little water to dissolve, extract the supernatant, add dilute hydrochloric acid or sodium hydroxide test solution 2 drops, the supernatant in yellow The fluorescence disappears.
7. Trace element potassium iodide: take 0.5 g sample and dissolve with 5 ml water. Then 1 ml 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 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 grams of sample, dissolved in 10 ml of water, take its solution by adding 2-3 drops of 10% iron potassium chloride solution, generate a dark blue precipitate, add a few drops of diluted hydrochloric acid, the precipitate is not easy to dissolve as authentic.
10. Magnesium sulphate: take 1 gram of sample, dissolve it in 10 ml of water, and add ammonia to precipitate white. Add appropriate amount of ammonium chloride to dissolve. A 5% solution of disodium hydrogen phosphate was added and a white precipitate formed. It was insoluble after adding ammonia water.
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