质量标准:   	GB/T 694-81
项目Item                                优级纯     分析纯    化学纯
                                         (GR)       (AR)      (CP)
含量(CH3COONa)Assay,%                  ≥99.0       99.0      98.5
pH(50g/L,25℃)pH of water solution     7.5-9.0    7.5-9.0    7.5-9.0
澄清度试验Clarity                        合格       合格      合格
水不溶物Insoluble matter in water,%    ≤0.005      0.005     0.01
氯化物(Cl)Chloride,%                   ≤0.001      0.002     0.005
硫酸盐(SO4)Sulfate,%                   ≤0.003      0.003     0.001
磷酸盐(PO4)Phosphate,%                 ≤0.0005     0.0005    0.001
镁(Mg)Magnesium,%                      ≤0.0005     0.0005    0.001
铝(Al)Aluminum,%                       ≤0.001      0.001     0.002
钙(Ca)Calcium,%                        ≤0.001        --        --
铁(Fe)Iron,%                           ≤0.0005     0.0005    0.001
重金属(以Pb计)Heavy metals,%           ≤0.001      0.001     0.002
ACS级
项目名称                              ACS Grade
含量Assay                              ≥99.0%
pH(5%,25.0℃)pH of a 5%
solution at 25.0℃                     ≥7.0-9.2
不溶物Insoluble matter                 ≤0.01%
干燥失重Loss on drying                 ≤1.0%
氯化物(Cl)Chloride                     ≤0.002%
磷酸盐(PO4)Phosphate                   ≤0.001%
硫酸盐(SO4)Sulfate                     ≤0.003%
钙(Ca)Calcium                          ≤0.005%
镁(Mg)Magnesium                        ≤0.002%
重金属(以Pb计)Heavy metals             ≤0.001%
铁(Fe)Iron                             ≤0.001%