二、分子式:MgSO4·7H2O,
干燥品,MgSO4·nH2O
质量指标 | Specification | GB29207-2012 | |
含量(MgSO4)(灼烧干基), w/% ≥ | Content( As MgSO4 )(After Ignition) | 99.0 | |
重金属(以Pb计),mg/kg ≤ | Heavy | 10 | |
铅 (Pb),mg/kg ≤ | Lead | 2 | |
硒 (Se),mg/kg ≤ | Selenium | 30 | |
pH 值(50g/L 溶液) | pH | 5.5-7.5 | |
氯化物(以Cl计),w/% ≤ | Chloride | 0.03 | |
砷 (As),mg/kg ≤ | Arsenic | 3 | |
铁 (Fe),mg/kg ≤ | Iron | 20 | |
灼烧减量w% | 七水合物 | Loss on | 40.0-52.0 |
干燥品 | Loss on | 22.0-32.0 |
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