Phytoaccumulation of organic pesticides and migration factor at plant

Phytoaccumulation of organic pesticides and migration factor at plant
부얀최승일Janjit Iamchaturapatr이상화이재성
Phytoremediation; organophosphorus; organochlorine; pesticide accumulation; migration factor; removal kinetics
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The performance of phytoremediation has proven to be effective in the removal of nutrients and metals from aqueous system. However, little information is available on the behavior of pesticides and its removal pathways in aquatic environment involving plant-uptake. The understanding of detailed kinetics of pesticide removal by plants and information on compound/plant partition coefficients can lead to an effective design of the phytoremediation process for anthropogenic pesticide reduction. It was determined that the reduction rates of four organophosphorus (OP) and two organochlorine (OC) pesticides (including diazinon, fenitrothion, malathion, parathion, dieldrin and HCB) could be formulated by first-order reaction kinetic. The magnitude of first-order kinetic constants(k) was dependent on the pesticide species and found in the range between 0.409–0.580d-1. Analytical results obtained by mass balances suggested that different chemical stability, including the diversity of molecular structures, half-lives, and the water solubility would greatly influence the removal mechanisms and pathways of OPs and OCs in a phytoreactor(PR). In the case of OP pesticides, plant accumulation was an important pathway for the removal of fenitrothion and parathion from water while pesticide sorption in suspended matter(SM) was an important pathway for the removal of dieldrin and HCB. The magnitude of the migration factor of pesticides()is a good indication for determining the tendency of a pesticide’s movement from below-to above-ground biomass. The uncertain ties related to the different phenomena involved in a laboratory phyto-experiment are also discussed.
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