In this research study, time-dependent sorption behavior of Dinetofuran (DNT), imidacloprid (IMD) and thiamethoxam (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.
Source: Sudarshan T. Kurwadkar et al. Journal of Environmental Science and Health, Part B: Pesticides, Food Contaminants, and Agricultural Wastes, Volume 48, Issue 4, 2013
http://www.tandfonline.com/doi/full/10.1080/03601234.2013.742412#.VGNab…
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