Polybasic zinc sulfate
Polybasic zinc sulfate:White or virescent lumpish crystals or powers.
| Item | Index | ||
| I type | II type | III type | |
| ( Fe ) content ( calculating FeSO4·7H2O ), % ≥ | 9.0 ( 40.0 ) | 4.5 ( 20.0 ) | 9.0 ( 40.0 ) |
| ( Fe ) content ( calculating FeSO4·7H2O ), % ≥ | 8.0 ( 40.0 ) | 12.0 ( 60.0 ) | 7.6 ( 39.0 ) |
| ( Mg ) content ( calculating MgSO4 ·7H2O ), % ≥ | —— | —— | 1.0 ( 10.0 ) |
| ( Cu ) content ( calculating CuSO4 ·5H2O ), % ≥ | —— | —— | 0.25 ( 1.00 ) |
| ( S ) content , % ≥ | 9.0 | ||
| ( Cd ) content, % ≤ | 0.003 | ||
| ( Pb ) content , % ≤ | 0.010 | ||
| ( As ) content , % ≤ | 0.007 | ||