質(zhì)量標準：
GB/T 660-92
項目Item                                        分析純     化學純
                                                 (AR)       (CP)
含量(NH4SCN)Assay,%                            ≥ 98.5      98.0
pH(50g/L溶液，25℃)                             4.5-6.0  4.5-6.0
澄清度試驗Clarity                                 合格      合格
水不溶物Insoluble matter in water,%            ≤ 0.005     0.01
灼燒殘渣(以硫酸鹽計)Ignition residue,%         ≤ 0.01      0.02
氯化物(Cl)Chloride,%                           ≤ 0.005     0.01
硫化物(S)Sulfide                               ≤ 0.001     0.002
硫酸鹽(SO4)Sulfate,%　                         ≤ 0.005     0.02
鐵(Fe)Iron,%                                   ≤ 0.0001    0.0003
銅(Cu)Copper,%                                 ≤ 0.0005    0.001
鉛(Pb)Lead,%                                   ≤ 0.0005    0.001
還原碘的物質(zhì)(以I計)Substances reducing iodine,%≤ 0.05      0.1

ACS級
項目名稱Item                                   ACS Grade
含量Assay                                      ≥97.5%
5%溶液25℃的pH值pH of a 5% solution at 25℃)   4.5-6.0
不溶物Insoluble matter                         ≤0.005%
灼燒殘渣Residue after ignition                 ≤0.025%
氯化物(Cl)Chloride(Cl)                         ≤0.005%
硫酸鹽(SO4)Sulfate                             ≤0.005%
重金屬(以Pb計)Heavy metals(as Pb)              ≤5ppm
鐵(Fe)Iron(Fe)                                 ≤0.0003%
還原碘的物質(zhì)(以I計)Iodine-consuming substances ≤0.004meq/g

99.99%：

外觀Appearance                          白色至無色結晶
純度Purity                              ≥99.99% Based On Trace Metals Analysis by ICP and Atomic Absorption
ICP Assay                               Confirms Sulfur component
不溶物insolubles                        ≤0.005%  
灼燒殘渣Ignition residue                ≤0.025%
pH range                                4.5 - 6.0
氯chloride (Cl-):                       ≤0.005%
硫酸根sulfate (SO42-):                  ≤0.005%
鐵Fe:                                   ≤3 ppm
重金屬heavy metals:                     ≤5 ppm
痕量金屬分析Trace Metal Analysis        ≤200.0 ppm by ICP Atomic emission
(Al、Ca、Fe、Mg)
痕量金屬分析Trace Metal Analysis        ≤200.0 ppm Atomic Absorption
(Li、Na、K、Rb、Cs) 

貯存：
密封陰涼處保存。
檢定和測定微量鐵，測定銀和汞等，聚合催化劑，抗菌素的分離，分析農(nóng)藥含量，水質(zhì)分析，配制硫氰酸根和標準溶液。