项目Item 分析纯 化学纯
(AR) (CP)
含(CeH16N4O16
S4· 4H2O)Assay,% ≥ 98.0 95.0
三价铈盐(CeO2)Cerous,% ≤ 0.2 0.8
其他稀土金属Other rare metals,% ≤ 0.2 0.8
硫酸不溶物Insolubhe in sulfuric acid,% ≤ 0.05 0.1
氯化物(Cl)Chloride,% ≤ 0.01 0.02
铝(以Al2O3计)Aluminum,% ≤ 0.08 0.08
氨水不沉淀物Substances not precipitated by ammonia,% ≤ 0.20 0.20
重金属(以Pb计)Heavy metals,% ≤ 0.005 0.015
铁(Fe)Iron,% ≤ 0.005 0.02
99.99% metals basis:
外观Appearance yellow to orange powder
X-射线衍射分析X-Ray Diffraction Conforms to standard
纯度Purity ≥99.99% Based on Trace Metals Impurities of ICP
ICP Assay Confirms cerium and sulfur component
Ce 18.9% - 22.8% (titration with dichromate)
痕量金属分析total metallic impurities ≤100ppm by ICP Atomic emission
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