Main functions and functions of pharmaceutical grade zinc oxide

 Main functions and functions of pharmaceutical grade zinc oxide Zinc oxide YanghuaxinZinc Oxide ZnO 81.
38 [1314-13-2] This product is calculated on the basis of incandescent product, and the content of ZnO shall not be less than 99.
0%
.

【Properties】This product is a white, yellowish-white, non-sandless fine powder
.

This product is insoluble in water or ethanol; soluble in dilute acid
.

【Identification】(1) Take this product, increase the heat, it will turn yellow; let it cool, the yellow will disappear
.

(2) The dilute hydrochloric acid solution of this product shows the identification reaction of zinc salt (general rule 0301)
.

[Check] Take 1.
0g of this product for alkalinity, add 10ml of freshly boiled hot water, shake for 5 minutes, let it cool, filter, add 2 drops of phenolphthalein indicator solution to the filtrate, if it turns pink, add hydrochloric acid titration solution (0.
1mol /L) 0.
10ml, the pink color should disappear
.

Take 1.
0g of this product for sulfate, dissolve it in an appropriate amount of dilute hydrochloric acid, and check it according to the law (general rule 0802).
Compared with the control solution made of 0.
5ml of standard potassium sulfate solution, it should not be deeper (0.
005%)
.

Take 2.
0g of this product from carbonate and acid insoluble matter, add 10ml of water and mix, add 30ml of dilute sulfuric acid, and heat it on a water bath without bubbles; after stirring, the solution should be clear
.

The weight loss on ignition is about 1.
0g of this product, accurately weighed, and ignited at 800 ℃ to constant weight, and the weight loss should not exceed 1.
0%
.

Take 0.
40g of this product for iron salt, add 8ml of dilute hydrochloric acid, 15ml of water and 2 drops of nitric acid, boil for 5 minutes to dissolve, let cool, add water to 50ml, shake well, take another 25ml, add 10ml of water, and check according to law (General Rule 0807) , compared with the control solution made of 1.
0ml of standard iron solution, it should not be deeper (0.
005%)
.

　　Take 5.
0g of this product, add 24ml of 50% nitric acid, boil for 1 minute, cool, dilute to 100ml, and measure it according to atomic absorption spectrophotometry (General Rule 2321), and it should not exceed 50 parts per million
.

　　Take 1.
0g of this product as arsenic salt, add 5ml of hydrochloric acid and 23ml of water to dissolve it, check it according to the law (the first method of General Rule 0822), and it should meet the regulations (0.
0002%)
.

　　[Determination of content] Take about 0.
1g of this product, accurately weigh it, add 2ml of dilute hydrochloric acid to dissolve, add 25ml of water and 1 drop of 0.
025% methyl red ethanol solution, add ammonia test solution dropwise until the solution is slightly yellow, add 25ml of water, ammonia -10ml of ammonium chloride buffer (pH10.
0) and a little chrome black T indicator, titrate with disodium EDTA titration solution (0.
05mol/L) until the solution changes from purple to pure blue
.

Each 1ml of EDTA disodium titration solution (0.
05mol/L) is equivalent to 4.
069mg of ZnO
.

　　【Category】Pharmaceutical excipients, fillers and bacteriostatic agents,
etc.

　　[Storage] Sealed and preserved
.