SPECIFICATION
Physical Appearance
White Crystaline Powder
Appearance of Solution
25% solution in distilled water hould be clear & colourless & free from External Impurities
Assay as NaHSO3-HCHO
97.0% Min
Free Bisulphate as NaHSO3
0.20% Max
Thiosulphate as Na2S2O3
0.05% Max
Iron as Fe.
0.002% Max
Heavy Metal as Pb
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