Jh. Yen et al., ASSESSMENT OF THE INSECTICIDE CARBOFURANS POTENTIAL TO CONTAMINATE GROUNDWATER THROUGH SOILS IN THE SUBTROPICS, Ecotoxicology and environmental safety, 38(3), 1997, pp. 260-265
The possible contamination of groundwater by the insecticide carbofura
n was assessed with the behavior assessment model (BAM) and groundwate
r pollution-potential model (GWP). Dissipation coefficients of this in
secticide in two subtropical soils at different moisture contents and
soil temperatures were studied by determining the degradation and adso
rption of the herbicide in soils, Movement of carbofuran was studied b
y leaching the insecticide in a soil column in the laboratory, Under 4
0% field capacity and at 25 degrees C, more than 80% of carbofuran res
idue was found in both Luchu clay and Yuanlin silty clay loam after in
cubation for 63 days, The results indicate that the higher the moistur
e content in the soil, the less the carbofuran residue under the soil
moisture below the field capacity, Carbofuran tends to dissipate more
easily in Yuanlin soil than in Luchu soil, The distribution coefficien
t (K-d) with r(2) of 0.69 and 0.92 for Luchu and Yuanlin soils, respec
tively, was found using the first-order kinetics law, In leaching expe
riment, carbofuran exhibited easier movement in Luchu than in Yuanlin
soil. (C) 1997 Academic Press.