Qidong A&P Pharmaceutical Co., Ltd.--Sodium thiosulfate (baking soda)|10102-17-7

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A&P Pharmaceutical

Sodium thiosulfate (baking soda)

CAS NO.：10102-17-7
Molecular Formula：Na₂S₂O₃ž5H₂O
Structural Formula：248.19

Structural formula:

Product standard:
Ndustrial grade: HG/T 2328-2006
Photographic grade: HG/T 3023-1989
Medicinal grade: ChP. 2020

Specifications：

Industrial grade			Photographic grade	Medicinal grade
Items	Index		Index	Index
Items	Superior products	Qualified products	Index	Index
Appearance	Colorless or yellowish transparent monoclinic crystals.		Solution appearance: Transparent without insoluble substances (excluding trace flocculent substances)	Character: This product is colorless, transparent crystal or crystalline fine particles; Odorless;
Sodium thiosulfate(Na2S2O3·5H2O）/%	≥99.0	≥98.0	99.0～101.0	≥99.0%, calculated as dry product
Water-insoluble substance/%	≤0.01	≤0.03	/	/
Sulfate and Sulfite	/	/	/	≤0.2%
Sulfides(Na2S)/%	≤0.001	≤0.003	≤0.001	≤0.0005%
Fe/%	≤0.002	≤0.003	≤0.003	/
NaCl/%	≤0.05	≤0.20	/	/
pH(200g/L solution)(20℃)	6.5～9.5			6.0-8.4
Heavy metals（as Pb）/%	/	/	≤10ppm	≤20ppm
Arsenic	/	/	/	≤10ppm
Loss on drying	/	/	/	32.0%-37.0%

Packaging: Medicinal grade 25kg cardboard drum; Industrial grade: 25kg, 50kg plastic woven bags; Photographic grade: plastic bucket, IBC bucket, liquid bag, tank truck, etc.

Uses: Medicinal grade: Antidote; Photographic grade: mainly used as a fixing agent in the photography industry; Industrial grade: used as reducing agent of chromate in tanning, neutralizer of nitrogen containing tail gas, mordant, bleaching agent of straw and wool, and dechlorination agent in pulp bleaching. It is also used in the manufacturing of tetraethyl lead, dye intermediates, and ore extraction of silver;

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