Miniaturized dielectric barrier discharge-atomic emission spectrometer for pesticide: Sensitive determination of thiram after derivatization with mercurial ion
文献类型： 外文期刊
作者： Han, Bingjun 1 ; Li, Ya 1 ; He, Yan 1 ; Lv, Daizhu 1 ; Peng, Lixu 1 ; Yu, Huamei 3 ;
作者机构： 1.Chinese Acad Trop Agr Sci, Anal & Testing Ctr, Hainan Prov Key Lab Qual & Safety Trop Fruits & V, Haikou 571101, Hainan, Peoples R China
2.Chinese Acad Trop Agr Sci, Environm & Plant Protect Inst, Haikou 571101, Hainan, Peoples R China
3.Hainan Univ, Coll Environm & Plant Protect, Haikou 570228, Hainan, Peoples R China
关键词： Pesticide residue; Dielectric barrier discharge; Atomic emission spectrometry; Derivatization
期刊名称：MICROCHEMICAL JOURNAL （ 影响因子：4.821； 五年影响因子：4.364 ）
ISSN： 0026-265X
年卷期： 2018 年 138 卷
页码：
收录情况： SCI
摘要： A novel method was developed to sensitively determine thiram (which we selected as a representative large molecular organic pesticide) using miniaturized dielectric barrier discharge-atomic emission spectrometry (DBD-AES), based on the determination of free mercurial ion (Hg2+) from Hg labeled thiram complex. The disulfide bond (-S-S-) in thiram was reduced to sulfhydryl (-SH) using tris(2-carboxyethyl)phosphine (TCEP), and inorganic Hg2+ was used as the derivatization reagent. It was found that SnCl2 could selectively reduce only free Hg2+ to Hg vapor in the presence of Hg2+-labeled thiram complex, which could be separated from sample matrices for sensitive DBD-AES detection. Under the optimized conditions, this method provided high sensitivity for thiram determination, with limits of detection as low as 0.0003 mg kg(-1) and linear dynamic ranges of 0.001-0.01 mg kg(-1). This analytical method performs better than the traditional analytical methods, demonstrating the potential usefulness and versatility of this new Hg-labeled DBD-AES system.
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