A novel vapor generation method using hydrogen-containing plasma for Se direct solid sampling,Journal of Analytical Atomic Spectrometry

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A novel vapor generation method using hydrogen-containing plasma for Se direct solid sampling
Journal of Analytical Atomic Spectrometry ( IF 3.1 ) Pub Date : 2020-02-27 , DOI: 10.1039/d0ja00005a
Ming Li _{1,

2,

3,

4} , Zhi Xing _{1,

2,

3,

4} , Gongwei Sun _{1,

2,

3,

4} , Jing Liang _{4,

5,

6} , Xiu Huang _{1,

2,

3,

4} , Bowen Fan _{1,

2,

3,

4} , Qing Wang _{4,

5,

6}

Affiliation

Sample introduction is one of the key factors restricting the development of fast, simple, high sensitivity and high throughput new analytical methods. In this work, a novel vapor generation method by hydrogen-containing plasma for direct solid sampling was proposed. The mechanism of vapor generation by hydrogen-containing plasma and the feasibility of quantitative elemental analysis by this method were discussed. The reduction of the oxidation state of Se is thermodynamically feasible with hydrogen radicals H*. Selenium on the surface of solid samples was efficiently converted to volatile molecular species. The optimum conditions for the proposed method coupled with atomic fluorescence spectrometry (AFS) as well as interference from coexisting elements were investigated. It was found that Fe, Cu, Ag, Au, Sb and Te had a significant enhancement effect on Se. Under the optimized conditions, the detection limit of Se was 19.7 pg. To demonstrate the accuracy of the proposed method, three aqueous certified reference materials were analyzed. The results were in good agreement with those obtained by inductively coupled plasma mass spectrometry (ICP-MS). Spike recovery experiments for the evaluation of the accuracy were also carried out, with recoveries ranging from 97.3% to 100.7%.

中文翻译：

利用含氢等离子体进行硒直接固体采样的新型蒸气发生方法

样品引入是限制快速，简单，高灵敏度和高通量新分析方法开发的关键因素之一。在这项工作中，提出了一种通过含氢等离子体进行直接固体采样的新的蒸汽产生方法。讨论了含氢等离子体产生蒸气的机理以及用该方法进行定量元素分析的可行性。用氢自由基H *在热力学上可行地还原Se的氧化态。固体样品表面上的硒被有效地转化为挥发性分子物质。研究了该方法与原子荧光光谱法（AFS）耦合的最佳条件，以及来自共存元素的干扰。发现铁，铜，银，金，Sb和Te对Se具有显着的增强作用。在最佳条件下，硒的检出限为19.7 pg。为了证明所提出方法的准确性，分析了三种水性认证参考材料。结果与通过电感耦合等离子体质谱法（ICP-MS）获得的结果吻合良好。还进行了尖峰恢复实验以评估准确性，回收率从97.3％到100.7％。

更新日期：2020-02-27

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