质量标准
Q/(HG)SJ 328-91
项目Item                                              分析纯        化学纯
                                                            (AR)         (CP)
含量(NH4SO3NH2)Assay,%                     ≥ 99.0        99.0
熔点范围Melting range,℃                      131.0-133.0  130.0-133.0
水不溶物Insoluble matter in water,%        ≤ 0.01        0.02
灼烧残渣(以硫酸盐计)Ignition residue,%    ≤ 0.01        0.03
氯化物(Cl)Chloride,%                              ≤ 0.002       0.004
硝酸盐(NO3)Nitrate,%                           ≤ 0.002       0.004
硫酸盐(SO4)Sulfate,%　                         ≤ 0.02        0.05
铁(Fe)Iron,%                                        ≤ 0.0005      0.0005
重金属(以Pb计)Heavy metals,%               ≤ 0.0005      0.0005 

ACS级
项目名称Item                                         ACS Grade
含量(NH4OSO2NH2)Assay                         ≥98.0%
熔点Melting point                                   131.0℃-133.0℃
水不溶物Insoluble matter                          ≤0.02%
灼烧残渣Residue after ignition                   ≤0.1%
重金属(以Pb计)Heavy metals(as Pb)           ≤5ppm