[磷酸钇共沉淀-火焰原子吸收光谱法测定氯化镍和硫酸锰中的痕量铅和铁]

[Determination of trace lead and iron in nickel chloride and manganese sulfate by flame atomic absorption spectrometry after coprecipitation with yttrium phosphate].

作者信息

Su Yao-Dong, Zhu Wen-Ying, Ma Hong-Mei, Chen Long-Wu

机构信息

Department of Chemistry, Tongji University, Shanghai 200092, China.

出版信息

Guang Pu Xue Yu Guang Pu Fen Xi. 2006 Sep;26(9):1732-4.

PMID:17112057

Abstract

Using yttrium phosphate as the coprecipitation collector for the separation and preconcentration of trace lead and iron in nickel chloride and manganese sulfate, flame atomic absorption spectrometric (FAAS) determination was described in the present paper. Coprecipitation parameters including the pH of the solution, and the amounts of YCl3 and H3 PO4 were discussed. It was found that lead and iron in nickel chloride could be coprecipitated quantitatively in the range of pH 3.0-4.0, and so could be lead in manganese sulfate. The detection limits (3sigma) of lead and iron in 20 mL solution were 1.63 x 10(-2) mg x L(-1) and 4.58 x 10(-2) mg x L(-1) respectively. In NiCl2 solution the standard addition recoveries for lead and iron were 100.91% and 99.73% respectively, and in MnSO4 solution the standard addition recoveries were 99.45% and 98.98% respectively. The method has eliminated the interference of matrix, and the result is satisfied.

摘要

本文描述了以磷酸钇作为共沉淀捕集剂，用于分离和预富集氯化镍和硫酸锰中的痕量铅和铁，然后采用火焰原子吸收光谱法（FAAS）进行测定。讨论了共沉淀参数，包括溶液的pH值、YCl₃和H₃PO₄的用量。结果表明，氯化镍中的铅和铁在pH 3.0 - 4.0范围内能够被定量共沉淀，硫酸锰中的铅也能如此。20 mL溶液中铅和铁（3σ）的检出限分别为1.63×10⁻² mg·L⁻¹和4.58×10⁻² mg·L⁻¹。在NiCl₂溶液中，铅和铁的标准加入回收率分别为100.91%和99.73%，在MnSO₄溶液中，标准加入回收率分别为99.45%和98.98%。该方法消除了基体干扰，结果令人满意。