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Key value for chemical safety assessment

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For ZnS, the aquatic toxicity tests on microorganisms is waived (because no exposure to zinc ions is anticipated).

Copper content in GSS is highly low (about 100 ppm), and bonded to the structure of ZnS (Zn is partially substituted with Cu), and according to the water solubility test, there is no copper detected(less than 0.0251 mg/L at PH 8.9). So the effect of copper iron can also be ignored.