A Novel Tungsten Coil Electrothermal Vaporizer with Composite Structure Coupled with Dielectric Barrier Discharge Optical Emission Spectrometer for Direct Determination of Trace Mercury

文献类型： 外文期刊

第一作者： Li, Xue

作者： Li, Xue;Liu, Jixin;Mao, Xuefei;Li, Xue;Liu, Jixin;Mao, Xuefei;Wang, Chao;Liu, Jixin

作者机构：

期刊名称：ATOMIC SPECTROSCOPY （ 影响因子：3.4； 五年影响因子：2.2 ）

ISSN： 0195-5373

年卷期： 2023 年 44 卷 2 期

页码：

收录情况： SCI

摘要： In this study, a small platinized tungsten coil (TC) with a composite structure was utilized for the first time in a liquid sampling electrothermal vaporizer (ETV) setup. A novel direct sampling mercury (Hg) analyzer coupled with a dielectric barrier discharge (DBD) and a miniature fiber optic spectrometer (FOS) as an optical emission spectrometer was fabricated for the sensitive determination of Hg in environmental water. This ETV setup displayed a maximum sample volume of 100 mu L and fulfilled the task of sequestering Hg during the dehydration and ashing processes under high temperature due to the formation of a platinum (Pt) and Hg amalgam. Under optimized conditions, the limit of detection (LOD) of Hg was 0.1 mu g L-1 for a 100 mu L liquid sample and the relative standard deviation (RSD) of 11 repeated measurements of Hg standard solution was 3.2%; the linearity (R-2) was > 0.999 in the range of 0.4-100 mu g L-1. The results for the GBW08063 sample (9.89 mu g L-1) agreed with the certified values of certified reference materials (CRMs) (10 mu g L-1), and the spiked recoveries were 94-100%, which proved favorable analytical accuracy and precision. The total analysis time was observed to be less than 3 min, and this small-sized ETV-DBD-OES system consumes only similar to 100 W of power while weighting less than 12 kg. Therefore, the proposed ETV-DBD-OES method demonstrates simplicity, suitable sensitivity, precision, and robustness, with promising application in the field for rapid water analysis for Hg.

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