Miniaturized dielectric barrier discharge-atomic emission spectrometer for pesticide: Sensitive determination of thiram after derivatization with mercurial ion

作者：Han, Bingjun^*; Li, Ya; He, Yan; Lv, Daizhu; Peng, Lixu; Yu, Huamei

来源：Microchemical Journal, 2018, 138: 457-464.

DOI：10.1016/j.microc.2018.01.026

• Pesticide residue
• Dielectric barrier discharge
• Atomic emission spectrometry
• Derivatization

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.

• 出版日期2018-5
• 单位中国热带农业科学院椰子研究所; 中国热带农业科学院; 海南大学