Lin Jian-Mei, Yao Jun-Xue, Zhao Wen-Yan
School of Chemistry and Chemical Engineering, Inner Mongolia University, Huhhot 010021, China.
Guang Pu Xue Yu Guang Pu Fen Xi. 2013 May;33(5):1357-9.
A method was proposed for the determination of trace lead with flame atomic absorption spectrometry after preconcentration of lead by rapid coprecipitation technique with PAR-Fe (III) at pH 6.0. The analytical parameters including pH, amount of iron (III), amount of reagent, the standing time of the precipitate, etc., were examined. The detection limits (DL) were found to be 18.7 microg x L(-1) for Pb (II). In analysis of lake water and the milk tea powder samples, RSD's and the standard addition recovery of this method were in the ranges of 1.03%-2.24% and 94.2%-98.3% respectively. The effect of matrix can be overcome by the method and the results are satisfyiog. The method shows good application prospect in the determination of trace lead owing to its rapidness and reproducibility.
提出了一种火焰原子吸收光谱法测定痕量铅的方法。该方法是在pH 6.0条件下，采用PAR-Fe（III）快速共沉淀技术对铅进行预富集后，再用火焰原子吸收光谱法测定。考察了pH值、铁（III）用量、试剂用量、沉淀静置时间等分析参数。发现Pb（II）的检测限为18.7 μg·L⁻¹。在湖水和奶茶粉样品分析中，该方法的相对标准偏差（RSD）在1.03% - 2.24%范围内，标准加入回收率在94.2% - 98.3%范围内。该方法可克服基体效应，结果令人满意。该方法具有快速、重现性好等特点，在痕量铅的测定中具有良好的应用前景。
