Sodium Thiosulfate

Appearance: This product is colorless, transparent crystalline or crystalline fine particles; Odorless; It is weathered in dry air and deliquescent in humid air; Weak alkaline reaction in aqueous solution;
Solubility: Highly soluble in water, insoluble in ethanol;
PH: 6.0-8.4;
Sulfate and sulfite: not exceeding 0.2%;
Sulfide: not exceeding 0.0005%
Related substances: The sulfite radical shall not exceed 0.15%, the tetrasulfate radical shall not exceed 0.15%, the maximum single impurity shall not exceed 0.10%, and the total impurity shall not exceed 0.50%;
Dry weight loss: 32.0%~37.0%;
Calcium salts: turbidity should not occur;
Heavy metals: not exceeding 0.002%;
Arsenic salt: not exceeding 0.001%;
Content: Calculated as dry product, Na₂S₂O₃ content shall not be less than 99.0%.