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%