氢氧化物共沉淀分离-分光光度法测定离子吸附型矿的稀土总量

Hydroxide Co-precipitation-Spectrophotometry of Total RE in Ion-sorption Type Ores

采用联合掩蔽共沉淀分离，共沉淀下的少量杂质在显色时加入掩蔽剂消除，在PH2．2～3．0范围内以偶氮砷Ⅲ显色，分光光度法直接测定，测定范围为0～50μg·mL-1×25-1，变异系数为2．2％，回收率为（100±3．8）％．

The determination method has the following steps: RE hydroxides co-precipitation,while Fe, Al, Ca,etc,are masked; masking the small amount of the co-precipitatedimpurities; developing with arsenazo N at PH 2. 2~3. 01 direct determination with spectrophotometry. The determination range is 0-50μg/mL X 25' Coefficent of variance 2. 2%.Recovery (100±3. 2) %.