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化学纯、分析纯、优级纯氯化钠试剂
氯化钠理化指标
项目 | 优级纯 | 分析纯 | 化学纯 |
氯化钠含量(%) | ≥99.8% | ≥99.5% | ≥99.5% |
pH值(50g/L 25℃) | 5.0~8.0 | 5.0~8.0 | 5.0~8.0 |
澄清度试验 | 合格 | 合格 | 合格 |
水不溶物(%) | ≤0.003 | ≤0.005 | ≤0.02 |
干燥失重(%) | ≤0.2 | ≤0.5 | ≤0.5 |
碘化物(I %) | ≤0.001 | ≤0.002 | ≤0.012 |
溴化物(Br %) | ≤0.005 | ≤0.01 | ≤0.05 |
硫酸盐(SO42- %) | ≤0.001 | ≤0.002 | ≤0.005 |
总氮量(N %) | ≤0.0005 | ≤0.001 | ≤0.003 |
磷酸盐(PO43- %) | ≤0.0005 | ≤0.001 | --- |
砷(As %) | ≤0.00002 | ≤0.00005 | ≤0.0001 |
镁(Mg %) | ≤0.001 | ≤0.002 | ≤0.005 |
钾(K %) | ≤0.01 | ≤0.02 | ≤0.04 |
钙(Ca %) | ≤0.002 | ≤0.005 | ≤0.01 |
六氰合铁酸盐(以Fe(CN)4计 %) | ≤0.0001 | ≤0.0001 | --- |
铁(Fe %) | ≤0.0001 | ≤0.0002 | ≤0.0005 |
钡(Ba %) | ≤0.001 | ≤0.001 | ≤0.001 |
重金属(以Pb计 %) | ≤0.0005 | ≤0.0005 | ≤0.001 |