Hydride generation atomic absorption spectrometry with a dielectric barrier discharge atomizer: Method optimization and evaluation of analytical performance for tin
Hydride generation atomic absorption spectrometry with a dielectric barrier discharge atomizer: Method optimization and evaluation of analytical performance for tin
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DOI：
10.1016/j.sab.2019.05.019
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发表时间：
2019-08
期刊：
影响因子：
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通讯作者：
Lucie Juhászová;S. Burhenn;Linda Sagapova;J. Franzke;J. Dědina;J. Kratzer
中科院分区：
文献类型：
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作者：
Lucie Juhászová;S. Burhenn;Linda Sagapova;J. Franzke;J. Dědina;J. Kratzer
采用原子吸收光谱仪(AAS)对平面介质阻挡放电(DBD)等离子体原子化器中氢化锡的原子化条件进行了优化。详细研究了高压电源的波形函数形状、DBD雾化器的设计以及加入NaOH颗粒的干燥管对防止残留气溶胶和水分进入DBD的影响。优化的实验装置包括一个方波高压电源与带有气相沉积电极的DBD耦合，在DBD雾化器上游有NaOH干燥器存在。当放电流量为1 2 0 m L −1时，最佳放电气体为Ar，最佳高压供电速率为7 k V。在优化的条件下，S ng−1SN的灵敏度为0.0 5 ng ng−1SN，检出限为1 1 ng 毫升−1SN。整个实验装置的优化使灵敏度比原来的装置提高了7倍，该装置由一个正弦源耦合到一个带有胶合电极的DBD雾化器，在没有干燥器的情况下。将优化条件下的DBD原子化器的分析性能与常用的外热式石英管原子化器进行了比较。
Atomization conditions for tin hydride in the planar dielectric barrier discharge (DBD) plasma atomizer were optimized with detection by atomic absorption spectrometry (AAS). The effects of apparatus arrangement such as the shape of a waveform function of the high voltage power supply source, DBD atomizer design as well as presence of a dryer tube filled with NaOH pellets to prevent residual aerosol and moisture transport into the DBD were investigated in detail. The optimal experimental setup consisted of a square wave high voltage power supply source coupled to a DBD with vapor-deposited electrodes in the presence of NaOH dryer upstream the DBD atomizer. Argon was found as the best discharge gas under a flow rate of 120 mL min−1while the DBD optimum high voltage supply rate was 7 kV. A sensitivity of 0.05 s ng−1Sn and a limit of detection of 1.1 ng mL−1Sn were reached under optimized conditions. Optimization of the whole experimental setup resulted in 7-fold improvement of sensitivity compared to the original arrangement consisting of a sinusoidal source coupled to a DBD atomizer with glued electrodes in absence of the dryer. The analytical performance of the DBD atomizer under optimized conditions was compared to that of a commonly used externally heated quartz tube atomizer.