Abstract 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 Hg0 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.

中文翻译：

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用于农药的微型介质阻挡放电-原子发射光谱仪：汞离子衍生化后福美双的灵敏测定

摘要 基于 Hg 中游离汞离子 (Hg2+) 的测定，开发了一种使用小型化介质阻挡放电-原子发射光谱法 (DBD-AES) 灵敏测定福美双（我们选择其作为代表性大分子有机农药）的新方法。标记的福美双。使用三（2-羧乙基）膦 (TCEP) 将福美双中的二硫键 (SS) 还原为巯基 (SH)，并使用无机 Hg2+ 作为衍生试剂。结果表明，在 Hg2+ 标记的福美双配合物存在时，SnCl2 只能选择性地将游离 Hg2+ 还原为 Hg0 蒸气，可将其从样品基质中分离出来进行灵敏的 DBD-AES 检测。在优化条件下，该方法测定福美双具有高灵敏度，检出限低至0。0003 mg kg-1 和 0.001–0.01 mg kg-1 的线性动态范围。这种分析方法的性能优于传统分析方法，证明了这种新型 Hg 标记 DBD-AES 系统的潜在用途和多功能性。