Simple micro-column with multi-walled carbon nanotubes for on-line preconcentration and determination of lead in natural water by hydride generation atomic fluorescence spectrometry
Simple micro-column with multi-walled carbon nanotubes for on-line preconcentration and determination of lead in natural water by hydride generation atomic fluorescence spectrometry
复制标题
DOI：
10.1007/s00604-009-0161-3
复制
发表时间：
2009-04
影响因子：
5.7
通讯作者：
Hong Wu;H. Wen;B. Han;B. Du;Jusheng Lu;Jiuying Tian
中科院分区：
文献类型：
--
作者：
Hong Wu;H. Wen;B. Han;B. Du;Jusheng Lu;Jiuying Tian
建立了流动注射在线预富集氢化物发生原子荧光光谱法测定铅的系统。它是基于一个简单的微柱填充多壁碳纳米管（MWCNTs）。基于多壁碳纳米管对分析物的吸附保留，通过在线引入样品到微柱系统中，实现了铅在多壁碳纳米管上的预富集。用0.3 mol L-1HNO 3溶解残留物，与KBH 4溶液合并，进行HG-AFS检测。在最佳实验条件下，当进样量为14.4mL时，增强因子为26。检测限为2.8 ng L− 1，0.2 μg L− 1 Pb的11次重复测量的精密度（RSD）为4.4%。通过对3种标准物质的分析验证了方法的有效性，并成功地应用于天然水样中痕量铅的测定。
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−1HNO3was introduced to elute the retained analyte and merged with KBH4solution 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−1and the precision (RSD) of 11 replicate measurements of 0.2 μg L−1Pb 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.