六水合硫酸铁（II）铵

性状：浅蓝绿色结晶，在空气中逐渐被氧化。密封避光保存。

含量[（NH4）Fe(SO4)2·6H2O],%                                                  ≥99.5

pH值（50g/L,25°C）                                                                     3.0~5.0

                                          杂质最高含量（以%计）

水不溶物                                                                                        0.005

氯化物（Cl）                                                                                  0.001

磷酸盐（PO4）                                                                              0.0005

锰（Mn）                                                                                       0.05

高铁（Fe）                                                                                     0.01

铜（Cu）                                                                                        0.002

锌（Zn）                                                                                        0.003

铅（Pb）                                                                                        0.002

氨水不沉淀物（以硫酸盐计）                                                           0.1