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项目Item 优级纯 分析纯 化学纯 (GR) (AR) (CP) 含量[(CH3COO)2Ba.H2O]Assay,% ≥99.0 99.0 98.0 硫酸不沉淀物Substances not preci- pitated by sulfuric acid,% ≤0.02 0.05 0.1 水溶液反应Solution reaction 合格 合格 合格 氯化物(Cl)Chloride,% ≤0.002 0.005 0.01 氮化合物(N)Nitrogen,% ≤0.001 0.002 0.005 水不溶物Insiluble matter in water,% ≤0.01 0.02 0.05 铁(Fe)Iron,% ≤0.00025 0.0005 0.001 重金属(以Pb计)Heavy metals,% ≤0.0005 0.001 0.002 钙和锶(硫酸盐)Calcium and strontium ≤0.02 0.1 0.2
ACS级 项目名称Item ACS Grade 含量Assay 99.0-102.0% 不溶物Insoluble matter ≤0.01% 氯化物(Cl).Chloride(Cl) ≤0.001% 氧化物(以NO3计)Oxidizing substances ≤0.005% 钙(Ca)Calcium(Ca) ≤0.05% 钾(K)Potassium(K) ≤0.003% 钠(Na)Sodium(Na) ≤0.005% 锶(Sr)Strontium(Sr) ≤0.2% 重金属(以Pb计)Heavy metals(as Pb) ≤5ppm 铁(Fe)Iron(Fe) ≤0.001%
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