期刊
MICROCHIMICA ACTA
卷 166, 期 1-2, 页码 41-46出版社
SPRINGER WIEN
DOI: 10.1007/s00604-009-0161-3
关键词
Flow injection; On-line preconcentration; Lead; Carbon nanotubes; Hydride generation atomic fluorescence spectrometry
资金
- Nature Science Foundation of Jiangsu Education Committee [07KJB150112]
- Natural Science Foundation of Jiangsu Province [BK2008121]
- Science and Technology Project of Xuzhou City [XM08C026]
A flow injection on-line preconcentration system was developed for the determination of lead by hydride generation atomic fluorescence spectrometry (HG-AFS). It is based on a simple micro-column filled with multiwalled carbon nanotubes (MWCNTs). The preconcentration of lead on the MWCNTs was carried out based on the adsorptive retention of analyte via on-line introducing the sample into the micro-column system. A 0.3 mol L-1 HNO3 was introduced to elute the retained analyte and merged with KBH4 solution for HG-AFS detection. Under the optimal experimental conditions, an enhancement factor of 26 was obtained with a sample consumption of 14.4 mL. The limit of detection was 2.8 ng L-1 and the precision (RSD) of 11 replicate measurements of 0.2 mu g L-1 Pb was 4.4%. The method was validated by analyzing three certified reference materials, and was successfully applied to the determination of trace lead in natural water samples.
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