Department of Engineering and Physics, Tarleton State University, Stephenville, Texas, USA.
J Environ Sci Health B. 2013;48(4):237-42. doi: 10.1080/03601234.2013.742412.
Dinetofuran (DNT), imidacloprid (IMD) and thiamethoxam (THM) are among the neonicotinoid insecticides widely used for managing insect pests of agricultural and veterinary importance. Environmental occurrence of neonicotinoid in post-application scenario poses unknown issues to human health and ecology. A sorption kinetic study provides much needed information on physico-chemical interaction of neonicotinoid with soil material. In this research study, time-dependent sorption behavior of DNT, IMD and THM in vineyard soil was studied. Sorption kinetics studies were conducted over a period of 96 hours with sampling duration varying from 0, 2, 4, 8, 12, 24, 60 and 96 hours. All three neonicotinoids exhibited very low sorption potential for the soil investigated. Overall percent sorption for all three neonicotinoids was below 20.04 ± 2.03% with highest percent sorption being observed for IMD followed by DNT and THM. All three neonicotinoids are highly soluble with solubility increasing with IMD < THM < DNT. Although, DNT has the highest solubility among all three neonicotinoids investigated, it exhibited higher percent sorption compared to THM, indicating factors other than solubility influenced the sorption kinetics. Low sorption potential of neonicotinoids indicates greater leaching potential with regard to groundwater and surface water contamination.
二噻农（DNT）、吡虫啉（IMD）和噻虫嗪（THM）是广泛用于防治农业和兽医重要害虫的新烟碱类杀虫剂之一。新烟碱类在后应用情景中的环境出现对人类健康和生态构成了未知的问题。吸附动力学研究为新烟碱类与土壤物质的物理化学相互作用提供了急需的信息。在这项研究中，研究了葡萄园土壤中二噻农、吡虫啉和噻虫嗪的时间依赖性吸附行为。在 96 小时的时间段内进行了吸附动力学研究，采样时间间隔为 0、2、4、8、12、24、60 和 96 小时。所有三种新烟碱类对所研究的土壤表现出非常低的吸附潜力。所有三种新烟碱类的总体吸附百分比均低于 20.04±2.03%，其中 IMD 的吸附百分比最高，其次是 DNT 和 THM。所有三种新烟碱类均具有高溶解度，溶解度随 IMD<THM<DNT 增加。尽管 DNT 在所有三种研究的新烟碱类中具有最高的溶解度，但它表现出比 THM 更高的吸附百分比，这表明除溶解度外的其他因素影响了吸附动力学。新烟碱类的低吸附潜力表明，它们在地下水和地表水污染方面具有更大的淋溶潜力。
