Abstract：
The objective of this study was to evaluate the dissipation kinetics of deltamethrin, emamectin benzoate, and hexythiazox in grapes. The QuEChERS method was employed and validated for the precise determination of these three pesticides using liquid chromatography-tandem mass spectrometry (LC-MS/MS). Excellent linearity was observed with regression coefficients exceeding 0.998. Notably, the limits of quantification (LOQ) were significantly lower than the maximum residue limits (MRLs) established for grapes by the European Union. The QuEChERS method l recovered 93.23% of the pesticides with an acceptable RSD of 5.35% (n = 180), demonstrating its suitability for quantifying them in grapes. Half-lives of deltamethrin, emamectin benzoate, and hexythiazox in grapes were 2.62-2.68 days, 8.15-7.30 days, and 3.24-4.01 days, respectively, for both single and double doses. Residues of all pesticides fell below the MRLs by the preharvest interval. This suggests that their application can be considered safe for grapes, ensuring both pest control and consumer safety.
摘要：
本研究的目的是评估溴氰菊酯的耗散动力学，甲氨基阿维菌素苯甲酸酯，和葡萄中的hexythiazox。使用QuEChERS方法并验证了使用液相色谱-串联质谱法（LC-MS/MS）精确测定这三种农药。观察到良好的线性，回归系数超过0.998。值得注意的是,定量限（LOQ）显着低于欧盟为葡萄建立的最大残留限（MRL）。QuEChERS方法l回收了93.23％的农药，可接受的RSD为5.35％（n=180），证明了它在葡萄中量化它们的适用性。溴氰菊酯的半衰期,甲氨基阿维菌素苯甲酸酯，葡萄中的己并噻唑酮为2.62-2.68天，8.15-7.30天，和3.24-4.01天，分别,单剂量和双剂量。在收获前间隔内，所有农药的残留量均低于MRL。这表明它们的应用可以被认为对葡萄是安全的，确保虫害控制和消费者安全。
