Enhancement reagents for simultaneous vapor generation of zinc and cadmium with intermittent flow system coupled to atomic fluorescence spectrometry
Enhancement reagents for simultaneous vapor generation of zinc and cadmium with intermittent flow system coupled to atomic fluorescence spectrometry
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DOI：
10.1016/j.aca.2003.12.024
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发表时间：
2004-04
影响因子：
6.2
通讯作者：
Hanwen Sun;R. Suo
中科院分区：
文献类型：
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作者：
Hanwen Sun;R. Suo
采用原子荧光光谱仪与间歇流动蒸气发生系统联用，研究了锌和镉的同时蒸气发生。分别考察了几种络合剂、表面活性剂和过渡金属离子作为增效剂。实验表明，适量的8-羟基喹啉或邻菲咯啉与镍离子同时存在，有效地提高了锌、镉的水蒸气生成效率。挥发性物质的产生被认为是一个加氢过程，解释了增强剂如何在蒸汽产生中发挥重要作用。此外，由于挥发性物质的不稳定性，反应温度、试剂的快速充分混合以及挥发性物质与液体的快速分离也是至关重要的。间歇流动蒸气发生同时测定锌和镉的方法导致了原子荧光光谱分析的发展。锌和镉的检出限(3σb)分别为1.6μgl−1和0.0 1μgl−1，相对标准偏差分别为3.6%(5 0μgl−1，n=11)和1.7%(2μgl−1，n=11)。锌和镉的测定结果通过标准物质的分析得到了证实，标准值与发现值吻合良好。
Simultaneous vapor generation of zinc (Zn) and cadmium (Cd) was evaluated by atomic fluorescence spectrometry coupled with an intermittent flow vapor generation system. Some complexing reagents, surfactant and transition metal ions were respectively tested as enhancement reagents. Experiments showed that an appropriate amount of 8-hydroxyquinoline or phenanthroline and nickel ion simultaneously, effectively improved the vapor generation efficiency of Zn and Cd. The volatile species generation was presumed to be a hydrogenation process interpreting how the enhancement reagents played an important role in vapor generation. Additionally, due to the instability of volatile species, reaction temperature, rapid and sufficient mixing of reagents and rapid separation of the volatile species from liquid phase were also crucial. The method of simultaneous determination of Zn and Cd by intermittent flow vapor generation led to the development of atomic fluorescence spectrometry. The detection limits (3σb) were 1.6μgl−1for Zn and 0.01μgl−1for Cd and the relative standard deviations were 3.6% for Zn (50μgl−1, n=11) and 1.7% for Cd (2μgl−1, n=11) respectively. Results for the determination of Zn and Cd have been confirmed by the analysis of CRMs with good agreement between the certified and found values.