| 光谱学与光谱分析 |
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| Determination of Trace Lead in Water and Milk Tea Powder Samples with Organic Coprecipitation-Flame Atomic Absorption Spectrometric |
| LIN Jian-mei, YAO Jun-xue*, ZHAO Wen-yan |
| School of Chemistry and Chemical Engineering, Inner Mongolia University, Huhhot 010021, China |
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Abstract 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 μg·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.
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Received: 2012-10-25
Accepted: 2013-01-22
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Corresponding Authors:
YAO Jun-xue
E-mail: jxyao108@sohu.com
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