Quality Standard:GB/T1272-88
项目ltem 优级纯 分析纯 化学纯
(GR) (AR) (CP)
含量(Kl)Assay,% ≥99.5% 98.5% 98.0%
pH(50g/L溶液,25℃)pH of water sol-
ution 6.0-8.0 6.0-8.0 6.0-8.0
澄清度试验Clarity 合格 合格 合格
水不溶物lnsoluble matter in water,% ≤0.005 0.01 0.02
氯化物及溴化物(以Cl计)Chloride and
bromide,% ≤0.01 0.02 0.05
碘酸盐及碘(以IO3计)lodate and iodine ≤0.0003 0.002 0.005
硫酸盐(SO4)Sulfate,% ≤0.002 0.005 0.01
磷酸盐(PO4)Phosphate,% ≤0.001 0.002 --
总氮量(N)Total nitrogen,% ≤0.001 0.002 0.002
钠(Na)Sodium,% ≤0.05 0.1 --
镁(Mg)Magnesium,% ≤0.001 0.002 0.005
钙(Ca)Calcium,% ≤0.001 0.002 0.005
铁(Fe)Iron ,% ≤0.0001 0.0003 0.0005
钡(Ba)Barium,% ≤0.001 0.002 0.004
重金属(以Pb计)Heavy metals,% ≤0.0002 0.0005 0.001
砷(As)Arsenic,% ≤0.00001 0.00002 --
还原性物质Reducing substances 合格 合格 --
ACS级
项目名称 ACS Grade
含量(KI)Assay ≥99.0%
25℃时5%溶液的pH值
pH of a 5% solution at 25℃ 6.0-9.2
水不溶物Insoluble matter ≤0.005%
干燥失重Loss on drying ≤0.2%
氯化物及氯酸盐(以Cl计)
Chlorine and bromide ≤0.01%
碘酸盐(IO3)Iodidi ≤0.0003%
磷酸盐(PO4)Phosphate ≤0.001%
硫酸盐(SO4)Sulfate ≤0.005%
钡(Ba)Barium ≤0.002%
重金属(以Pb计)Heavy metals ≤5ppm
铁(Fe)Iron ≤0.0003%
钙(Ca)Calcium ≤0.002%
镁(Mg)Magnesium ≤0.001%
钠(Na)Sodium ≤0.005%