Considering the increase in agricultural production in Tocantins and in the use of pesticides for such production, this work investigates the levels of pesticide residues in different environmental compartments (soil, sediment, and water samples) of the Formoso River in the state of Tocantins, Brazil. The presence of pesticides of the triazine, triazole, and benzimidazole classes was analyzed by UHPLC-MS/MS from April 2018 to February 2019. There were four quarterly collections in the dry and rainy periods. The active principles were not found in sediment samples. In soil samples, only the active ingredients tebuconazole and propiconazole were found in the third collection campaign. The active ingredients amethryn, atrazine, carbendazim, epoxiconazole, metconazole, propiconazole, simazine, tebuconazole, and tetraconazole were found in water samples from Formoso River at concentrations of up to 0.286 µg L⁻¹ (atrazine). Although the substances are in low concentrations, we cannot assume that this toxicity is low considering that the risk of a certain pesticide depends on levels and exposure time. Therefore, the action of substances external to the natural environment always threatens biodiversity.

考虑到Tocantins农业产量的增长以及在农药生产中的使用，本研究调查了巴西Tocantins州Formoso河不同环境区室（土壤，沉积物和水样）中农药残留的水平。通过UHPLC-MS / MS从2018年4月至2019年2月分析了三嗪，三唑和苯并咪唑类农药的存在。在干燥和雨季有四个季度收集。在沉积物样品中未发现有效成分。在土壤样品中，第三次收集活动中仅发现了活性成分戊唑醇和丙环唑。活性成分紫水晶，at去津，多菌灵，环氧康唑，甲康唑，丙环唑，西咪嗪，戊唑醇，^-1（阿特拉津）。尽管这些物质的浓度很低，但考虑到某种农药的风险取决于其含量和暴露时间，我们不能认为这种毒性很低。因此，自然环境外部物质的作用总是威胁生物多样性。