Item Standard Assay ( as Na2S2O5 ) ≥97% PH value 4.0-4.6 Heavy metal (Pb) ≤0.002% As ≤0.0002% Fe ≤0.005%
Item Standard Assay ( as Na2S2O5 ) ≥97% PH value 4.0-4.6 Heavy metal (Pb) ≤0.002% As ≤0.0002% Fe ≤0.005%
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