Determination of nitrite in water samples using atmospheric pressure glow discharge microplasma emission and chemical vapor generation of NO species

文献类型： 外文期刊

第一作者： Zheng, Hongtao

作者： Zheng, Hongtao;Guan, Xuedi;Zhu, Zhenli;Yang, Chun;Hu, Shenghong;Zheng, Hongtao;Guan, Xuedi;Qiu, Haiou;Mao, Xuefei;Zhu, Zhenli

作者机构：

关键词： Atmospheric pressure glow discharge;Microplasma;Molecular emission spectroscopy;Nitrite determination;Potable waters

期刊名称：ANALYTICA CHIMICA ACTA （ 影响因子：6.558； 五年影响因子：6.228 ）

ISSN： 0003-2670

年卷期： 2018 年 1001 卷

页码：

收录情况： SCI

摘要： In this work, a low-power (<25 W), portable direct current (dc) atmospheric pressure glow discharge microplasma (4 mm x 10 mm) molecular emission spectrometer (APGD-MES) is developed for the determination of nitrite by using chemical vapor generation. Nitrite is on-line reduced to volatile nitric oxide (NO) by 1.5% (m/v) ascorbic acid and 1.0 mol L-1 hydrochloric acid. Then, the generated NO was separated and transferred into the APGD microplasma by an argon stream (100 mL min(-1)) for its excitation, and NO emission was measured by a microspectrometer. The effects of operational parameters of the APGD microplasma source and vapor generation of nitrite were investigated and the analytical figures of merit for nitrite detection was evaluated. The limit of detection of the proposed method was calculated to be 0.26 mu g mL(-1) of nitrite by measuring NO emission at 237.0 nm. The calibration curve is linear for the nitrite concentration in the range of 2.0-100.0 mu g mL(-1) and good precision (2.3%, RSD) is readily achieved for 5.0 mu g mL(-1) nitrite. The accuracy of this procedure was demonstrated by nitrite detection in a certified reference material. Analyte recoveries test were also performed to verify the accuracy of the method for nitrite determination in a series of environmental water samples. It was found that the concentration of nitrite of these samples were all below the LOD, and the obtained recoveries were in the range of 95-117%. The proposed APGD-MES method provides an alternative useful technique for screening potential nitrite pollution of potable waters. (C) 2017 Published by Elsevier B.V.

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