磷酸铈共沉淀分离富集硫酸钴中痕量铅及铅的原子吸收光谱测定  

Separation and preconcentration of trace lead in cobalt sulfate by coprecipitation with cerium phosphate

作　　者：苏耀东[1] 李静[1] 马红梅[1] 

机构地区：[1]同济大学化学系,上海200092

出　　处：《分析试验室》2005年第2期70-72,共3页Chinese Journal of Analysis Laboratory

摘　　要：提出了用磷酸铈(CePO4)作为共沉淀捕集剂分离富集CoSO4溶液中的痕量Pb2+,用火焰原子吸收光谱(FAAS)测定的方法。共沉淀效率受pH、Ce(NO3)3和H3PO4溶液用量的影响。结果显示,在溶液pH3.0～4.0时,CePO4能够定量共沉淀CoSO4溶液中的Pb2+,对于20mL的样品溶液,方法的检出限为5.59×10-2mg/L,铅的标准加入回收率为98.32%,排除了基体干扰,取得了较为满意的结果。A separation and preconcentration method by coprecipitation with cerium phosphate for the determination of trace lead (Ⅱ) in cobalt sulfate was studied using flame atomic absorption spectrometry. Several parameters influencing the efficiency of the coprecipitation method were evaluated including pH of water and CoSO_4 solution, concentration of Ce(NO_3)_3 solution and H_3PO_4. Lead was quantitatively coprecipitated with CePO_4 from CoSO_4 solution in the range of pH 3.0～4.0. The determination limit is 5.59×10^(-2) mg/L and the standard addition recovery is 98.32%. The interference of matrix has been ultimately overcome and the satisfactory results have been obtained.

关 键 词：铅 磷酸铈 分离富集 共沉淀 原子吸收方法 

分 类 号：O657.32[理学—分析化学]