Medicinal grade sodium metabisulfite cas7681-57-4 use

Medicinal grade sodium metabisulfite cas7681-57-4 Use Sodium metabisulfite is used as preservative, bleaching agent and loose agent
in food processing.

Industrially, sodium metabisulfite is used in printing and dyeing, organic synthesis, printing, tanning, pharmaceutical and other departments; Sodium metabisulfite is used in the chemical and pharmaceutical industries for the production of insurance powders, sulfadimethime pyrimidine, caprolactam, etc.
as well as the purification of chloroform, phenylpropion sulfone and.

The photographic industry is used as an ingredient for fixing agents
.

The fragrance industry is used to produce vanillin
.

Used as a preservative, rubber coagulant and cotton dechlorination agent
after bleaching in the brewing industry.

Organic intermediates, dyes, tannery are used as reducing agents for electroplating, wastewater treatment in oil fields and as mineral processing agents for mines, etc
.

【Content determination】 Take about 0.
15g of this product, precision weighing, put in the iodine measuring bottle, precision iodized titration solution (0.
05mol/ L) 50ml, dense plug, shake dissolved, add 1ml hydrochloric acid, titrate with sodium thiosulfate titration solution (0.
1mol / L), at the near end point, add starch indicator solution 2ml, continue to titrate until the blue disappears; The results of the titration are corrected
with a blank test.

Each 1 ml of iodine titration solution (0.
05 mol/L) is equivalent to 4.
752 mg of Na2S2O5
.

[7681-57-4] This product contains Na2S2O5 not less than 95.
0%.
【Properties】This product is colorless to white-like crystalline or crystalline powder
.

This product is easily soluble in water and very slightly soluble
in ethanol.

【Identification】 (1) Take the iodine test solution, add the aqueous solution of this product dropwise (1→20) to an appropriate amount, and the color of iodine will disappear; The resulting solution shows the reaction of sulfate identification (1) and (3) (General 0301
).

(2) Flame reaction of sodium salts in this product (General 0301
).