Intensive agriculture requires the use of several phytosanitary products. Pesticides of the carbamate family are used to eliminate the crop pests by acting on their nervous system. This study aims to determine the kinetic degradation of Zectran, the 4-(dimethylamino)-3,5-dimethylphenyl N-methylcarbamate (20 mg L⁻¹) using ⁶⁰Co gamma radiation source. The absorbed doses were analyzed by Liquid Chromatography (LC-DAD) using a column RP-18 PRISM (250 mm × 4,6 mm, 5 µm) and a mobile phase composed with a mixture of acetonitrile and water (70/30). The results showed that the Zectran was completely eliminated at absorbed dose of 6 kGy. The pseudo-first kinetic order could describe the removal of Zectran by gamma radiation with k_obs = 0.389 kGy⁻¹. The degradation mechanism by gamma irradiation was proposed based on the analysis of the by-products using an LC coupled to a QTOF mass spectrometer. The kinetic rates of the two intermediate compounds were calculated.

集约化农业需要使用几种植物检疫产品。氨基甲酸酯类农药通过作用于神经系统，从而消除了农作物中的害虫。这项研究旨在确定使用⁶⁰ Coγ射线源的Zectran，4-（二甲基氨基）-3,5-二甲基苯基N-甲基氨基甲酸酯（20 mg L ^-1）的动力学降解。使用RP-18 PRISM色谱柱（250 mm×4,6 mm，5 µm）和由乙腈和水的混合物组成的流动相（70/30），通过液相色谱法（LC-DAD）分析吸收剂量。结果表明，Zectran在吸收剂量为6 kGy时被完全消除。拟第一动力学级可以描述通过k _obs  = 0.389 kGy的伽马辐射去除Zectran^-1。基于使用耦合到QTOF质谱仪的LC对副产物的分析，提出了通过γ辐照的降解机理。计算了两种中间化合物的动力学速率。