Modeling the Transport and Degradation of Methomyl and Carbofuran in Soil-WaterSystems

摘要

The concern over groundwater contamination has risen to the forefront of publicconcern and media attention. The movement of the carbamate insecticides methomyl (S-methyl N-((methyl-carbamoyl)-oxy)-thioacetimidate) and cabofuran (2,3-dihydro-2,2-dimethyl-7-benzofuranol methylcarbamate) was investigated under steady state flow conditions in a small scale (21.5 cm in length by 2.5 cm i.d.) laboratory soil column. The dynamic flow system (soil column) permitted the simultaneous study of pesticide sorption and degradation during transport through three different soils (two for carbofuran). Flow rate and pulse application lengths were varied. Two analytical solutions to the convection dispersion equation with first-order degradation model (CXTFIT and CXT4) were used to quantify the miscible displacement sorption and degradation parameters. (Author)