Rapid detection of ultratrace urinary arsenic by direct sampling microplasma vaporization based on silicon nitride

文献类型： 外文期刊

第一作者： Sun, Huifang

作者： Sun, Huifang;Liu, Jixin;Mao, Xuefei;Wang, Chunhui;Qian, Yongzhong;Sun, Huifang;Liu, Jixin;Mao, Xuefei;Wang, Chunhui;Qian, Yongzhong;Liu, Jixin;Zhao, Yabo

作者机构：

关键词： Silicon nitride; Dielectric barrier discharge; Microplasma vaporization; Direct sampling analysis; Urinary arsenic

期刊名称：ANALYTICA CHIMICA ACTA （ 影响因子：6.2； 五年影响因子：5.9 ）

ISSN： 0003-2670

年卷期： 2023 年 1251 卷

页码：

收录情况： SCI

摘要： At present, immediate monitoring urinary arsenic is still a challenge for treating arsenic poisoning patients. Thus, a fast, reliable and accurate analytical approach is indispensable to monitor ultratrace arsenic in urine sample for health warning. In this work, a silicon nitride (SN) rod was first integrally utilized as a sample carrier for <= 50 mu L urinary aliquot, an electric heater for removing water and ashing sample as well as a high voltage electrode for dielectric barrier discharge vaporization (DBDV). The direct analytical method of arsenic in urine without sample digestion was thus developed using atomic fluorescence spectrometer (AFS) as a model detector. After 4 V electrically heating the SN rod for 60 s, urine sample was dehydrated and ashed outside; then, DBD was exerted under 0.8 A with 0.8 L/min H2 + Ar (1:9, v:v) for 20 s to vaporize arsenic analyte from the SN rod. After optimization, 0.014 mu g/L arsenic detection limit (LOD) was reached with favorable analytical precision (RSD <5%) and accuracy (91-110% recoveries) for real sample analysis. As a result, the whole analysis process only consumes <3 min to exclude complicated sample preparation; furthermore, the designed DBDV system only occupies 25 W and <2 kg, which renders a miniature sampling component to hyphenate with a miniature detector to detect arsenic. Thus, this direct sampling DBDV method extremely fulfills the fast, sensitive and precise detection of ultratrace arsenic in urine sample.

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