TEST ITEMS | TEST STANDARD | |||
FOOD GRADE | INDUSTRY GRADE ONE | INDUSTRY GRADE TWO | INDUSTRY GRADE ONE | |
Na2S2O5 %≥ | 96.5 | 96.0 | 94.0 | 92.5 |
FERROUS(Fe) %≤ | 0.005 | 0.005 | 0.010 | 0.015 |
WATER INSOLUBLE %≤ | _ | 0.05 | 0.05 | 0.10 |
ARSENIC(As) %≤ | 0.0001 | 0.0001 | _ | _ |
HEAVY METAL(Pb) %≤ | 0.0005 | _ | _ | _ |
CLARITY | PASS | _ | _ | _ |