Quality Standard:	Q/(HG)SJ 017-91
项目Item                  优级纯  分析纯   化学纯
                                 (GR)      (AR)     (CP)
pH(50g/L溶液)pH of              5.0-8.0   5.0-8.0   5.0-8.0
water solution                  
澄清度试验Clarity             合格     合格   合格
水不溶物lnsoluble matter    
in water,%                     ≤0.002   0.005    0.01
氯化物(Cl)Chloride,%           ≤0.0005  0.001    0.002
硝酸盐(NO3)Nitrate,%         ≤0.001   0.001    0.003
铵盐(NH4)Ammonium,%          ≤0.0002  0.0005   0.0001
磷酸盐(PO4)Phosphate,%       ≤0.0005  0.0005   0.001
钙(Ca)Calcium,%          ≤0.0005    0.0005    0.002
镁(Mg)Magnesium,%              ≤0.0005    0.0005    0.001
铁(Fe)Iron,%              ≤0.0001    0.00025   0.0005
砷(As)Arsenic,%                ≤0.00005   0.0001    0.0001
重金属(以Pb计)Heavy metals,%  ≤0.0003    0.0005    0.001
ACS级
项目名称                       ACS Grade
含量(Na2SO4·10H2O)Assay       ≥99.0%
pH(5%溶液,25.0℃)
pH of a 5% solution at 25.0℃    5.2-9.2
水不溶物Insoluble matter       ≤0.001%
氯化物(Cl)Chloride             ≤5ppm
磷酸盐(PO4)Phosphate           ≤5ppm
重金属(以Pb计)Heavy metals     ≤3ppm
铁(Fe)Iron                     ≤5ppm
钙(Ca)Calcium                  ≤0.005%
镁(Mg)Magnesium                ≤0.003%
钾(K)Potassium                 ≤0.005%