Pesticide levels in agricultural drainage systems in Quebec.

摘要

study was conducted to measure pesticide concentrations from two tile-drained potato fields in Saint-Leonard d'Aston, Quebec. Soil and water samples were analysed for the pesticides metribuzin, fenvalerate and aldicarb in 1989, and for metribuzin and phorate in 1990.;Pesticide levels were higher in the surface soil layer (0-5 cm), than at 25 cm depth. Fenvalerate was detected at a level of 0.013 ;Metribuzin concentrations up to 3.47