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GB/T654-77
项目Item 分析纯 化学纯
(AR) (CP)
含量(BaCO3),% ≥99.0 99.0
澄清度试验Clarity 合格 合格
盐酸不溶物lnsoluble in hydroc-hloric acid ≤0.01 0.05
游离碱(以OH计)Free alkali,% ≤0.02 0.05
氯化物(Cl)Chloridea,% ≤0.002 0.01
硫化物(S)Sulfale compounds,% ≤0.0001 0.0005
氮化合物(N)Nitrogen compounds,% ≤0.002 0.005
钙及锶(以硫酸盐计)Calcium and strontium,% ≤0.15 0.5
铁(Fe)Iron,% ≤0.0005 0.0015
重金属(以Pb计)Heavy metals,% ≤0.0005 0.001
硫酸不沉淀物Substances not prec-
ipitated by sulfuric acid,% ≤0.05 0.2
ACS级
项目名称Item ACS Grade
含量Assay ≥99.0-101.0%
稀盐酸不溶物Insoluble in dilute hydrochloric acid ≤0.015%
氯化物(Cl)Chloride(Cl) ≤0.002%
游离碱Water-soluble titrable base 0.002meq/g
氧化物(以NO3计)Oxidizing substances ≤0.005%
硫化物(以S计)Sulfide(S) 0.001%
钙(Ca)Calcium(Ca) ≤0.05%
钾(K)Potassium(K) ≤0.005%
钠(Na)Sodium(Na) ≤0.02%
锶(Sr)Strontium(Sr) ≤0.7%
重金属(以Pb计)Heavy metals(as Pb) ≤0.001%
铁(Fe)Iron(Fe) ≤0.002%
项目 高纯级
BaCO3(以干基计)% ≥99.8
K% ≤0.001
Na% ≤0.001
Mg% ≤0.001
Ca% ≤0.005
Sr% ≤0.001
Cl% ≤0.005
Fe% ≤0.001
H2O% ≤0.1
D50 0.5-1.5μm
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