Effects of anode geometry on the analytical performance of solution-cathode glow discharge for alkali metal detection by atomic emission spectroscopy

文献类型： 外文期刊

第一作者： Wang, Jinmei

作者： Wang, Jinmei;Li, Wei;Zheng, Peichao;Li, Biao;Zhang, Biyong;Guo, Lianbo;Tian, Hongwu;Dong, Daming;Tian, Hongwu;Dong, Daming

作者机构：

期刊名称：JOURNAL OF ANALYTICAL ATOMIC SPECTROMETRY （ 影响因子：3.1； 五年影响因子：3.1 ）

ISSN： 0267-9477

年卷期： 2025 年 40 卷 2 期

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收录情况： SCI

摘要： The effect of anode geometries on the analytical performance of the solution-cathode glow discharge (SCGD) source was investigated using tungsten rods with varying diameters and conical angles for atomic emission spectroscopy (AES). Under optimal operational parameters (electrolyte solution: HNO3 at pH 1.0, discharge current: 65 mA, solution flow rate: 1.9 mL min-1, and discharge distance: 2.0 mm), the highest emission intensity and stability for Na, Rb, K, Li, and Cs were obtained at the tungsten rod with a diameter of 2.4 mm, with relative standard deviations (RSD) of 1.14%, 0.93%, 1.01%, 1.25%, and 0.94%, respectively, while achieving the best detection limits (DLs). Additionally, when the anode tip had a conical angle of less than 30 degrees, thermal melting resulted in discharge instability. A conical angle greater than 90 degrees induced thermal spreading, leading to instability. Higher emission intensity stability and lower DLs were achieved with a conical angle of 60 degrees. These results may provide new insights for enhancing the performance of SCGD systems.

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