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1 | sodium metabisulphite (na2s2o5) % | 96.81 | ||||
2 | so2 % ≥ | 65.21 | ||||
3 | fe % ≤ | 0.002 | ||||
4 | clarity | clear | ||||
5 | insoluble matter in nitric acid% ≤ | 0.009 | ||||
6 | heavy metals (pb)% ≤ | 0.0004 | ||||
7 | as% | <0.0001 | ||||
8 | phosphoric acid test ≤ | 4.2 |