硫酸镁

性状：无色结晶或白色粉末。在干燥空气中易风化。密封于阴凉处保存。

技术条件

含量（MgSO4·7H2O）,%                                         ≥99.0

pH值（50g/L,25°C）                                                5.0~8.0

                             杂质最高含量（以%计）

澄清度试验                                                                 合格

水不溶物                                                                    0.005

氯化物（Cl）                                                             0.0005

砷（As）                                                                   0.0001

钠（Na）                                                                  0.005

钙（Ca）                                                                   0.02

锰（Mn）                                                                  0.001

铁（Fe）                                                                    0.0005

重金属（以Pb计）                                                       0.0005