质量标准: HG/T 3-1101-77
项目Item 分析纯 化学纯
(AR) (CP)
含量(C4H4Na2O6·2H2O)Assay,% ≥99.0 98.0
水溶液反应Water solution reaction 合格 合格
澄清度试验Clarty 合格 合格
水不溶物Insiluble matter in water,% ≤0.005 0.01
氯化物(Cl)Chloride,% ≤0.002 0.005
硫酸盐(SO4)Sulfate ,% ≤0.005 0.01
磷酸盐(PO4)Phosphate,% ≤0.002 --
铁(Fe)Iron,% ≤0.002 0.005
重金属(以Pb计)Heavy metals,% ≤0.0005 0.001
ACS级
项目名称 ACS Grade
含量(C4H4Na2O6·2H2O)Assay 99.0-101.0%
干燥失重Loss on drying 15.61%-15.71%
pH(5%溶液,25.0℃)pH of a 5% solution at 25.0℃ 7.0-9.0
水不溶物Insoluble matter ≤0.005%
氯化物(Cl)Chloride ≤5ppm
磷酸盐(PO4)Phosphate ≤5ppm
硫酸盐(SO4)Sulfate ≤0.005%
铵(NH4)Ammonium ≤0.03%
钙(Ca)Calcium ≤0.01%
重金属(以Pb计)Heavy metals ≤5ppm
铁(Fe)Iron ≤0.001%