Langaro Ana Cláudia, Souza Matheus de Freitas, Pereira Gustavo Antônio Mendes, Barros João Pedro Ambrósio, Silva Antonio Alberto da, Silva Daniel Valadão, Passos Ana Beatriz Rocha de Jesus, Mendonça Vander
Instituto de Agronomia, Universidade Federal Rural do Rio de Janeiro, Seropédica, Rio de Janeiro 23897-000, Brazil.
Departamento de Ciências Agronômicas e Florestais, Universidade Federal Rural do Semi-Árido, Mossoró, Rio Grande do Norte 59625-900, Brazil.
Toxics. 2020 Dec 17;8(4):123. doi: 10.3390/toxics8040123.
The selection of weed biotypes that are resistant to glyphosate has increased the demand for its use mixed with other herbicides, such as sulfentrazone. However, when chemical molecules are mixed, interactions may occur, modifying the behavior of these molecules in the environment, such as the sorption and desorption in soil. In this study, we hypothesized that the presence of glyphosate-formulated products might increase the sorption or decrease the desorption of sulfentrazone, thereby increasing the risk of the contamination of water resources. Therefore, our work aimed to evaluate the sorption, desorption, and leaching of sulfentrazone in the soil in an isolated and mixed application with different glyphosate formulations. The sorption coefficients (Kfs) for the sulfentrazone, sulfentrazone + Roundup Ready, sulfentrazone + Roundup Ultra, and sulfentrazone + Zapp Qi foram were 1.3, 2.1, 2.3, and 1.9, respectively. The desorption coefficients (Kfd) for the sulfentrazone, sulfentrazone + Roundup Ready, sulfentrazone + Roundup Ultra, and sulfentrazone + Zapp Qi foram were 65.7, 125.2, 733.3 and 239.8, respectively. The experiments demonstrated that the sorption and desorption of sulfentrazone in combination with the other formulated glyphosate products are altered, supporting the hypothesis suggested by this work, i.e., that the presence of other molecules is a factor that affects the behavior of herbicides in the soil. This phenomenon altered the vertical mobility of sulfentrazone. Situations involving mixtures of pesticides should be evaluated in order to improve our understanding of the dynamics of these molecules and thus avoid environmental contamination.
对草甘膦具有抗性的杂草生物型的出现，增加了将草甘膦与其他除草剂（如乙磺唑隆）混合使用的需求。然而，当化学分子混合时，可能会发生相互作用，改变这些分子在环境中的行为，例如在土壤中的吸附和解吸。在本研究中，我们假设草甘膦制剂产品的存在可能会增加乙磺唑隆的吸附或减少其解吸，从而增加水资源污染的风险。因此，我们的工作旨在评估乙磺唑隆在与不同草甘膦制剂单独和混合施用时在土壤中的吸附、解吸和淋溶情况。乙磺唑隆、乙磺唑隆+农达、乙磺唑隆+农达超、乙磺唑隆+草霸奇福安的吸附系数（Kfs）分别为1.3、2.1、2.3和1.9。乙磺唑隆、乙磺唑隆+农达、乙磺唑隆+农达超、乙磺唑隆+草霸奇福安的解吸系数（Kfd）分别为65.7、125.2、733.3和239.8。实验表明，乙磺唑隆与其他草甘膦制剂产品混合时的吸附和解吸会发生改变，支持了本研究提出的假设，即其他分子的存在是影响除草剂在土壤中行为的一个因素。这种现象改变了乙磺唑隆的垂直迁移性。应评估涉及农药混合物的情况，以增进我们对这些分子动态的理解，从而避免环境污染。
