Cas号7440-19-9分子式***分子量150.35含量assay≥99.9%外观Appearance银***粉末总痕量金属杂质Totaltracemetalimp.<0.1%REMin%99***/RE%99.9稀土杂质max,%Pr0.01Nd0.01La0.004Y0.005Ce0.02非稀土杂质max,%Fe0.03Si0.01Mg0.005Ca0.007粒度，目180~200)