Fate of MCPP and atrazine in an anaerobic landfill leachate plume (Grindsted, Denmark)

The fate of the two pesticides MCPP (mecoprop) and atrazine was investigate d in an anaerobic aquifer downgradient from the Grindsted Landfill, Denmark , by means of ii field injection experiment, in situ microcosms and laborat ory batch experiments. The redox conditions in the experiments were dominat ed by iron reduction, but also methanogenesis and sulfate reduction occurre d closest to the landfill. No degradation nor sorption was observed for the two pesticides in any of the biologically active experiments. In microbial ly inhibited laboratory experiments, supplied with sodium azide as a steril izing agent, a chemical degradation of atrazine occurred. (C) 1999 Elsevier Science Ltd. Aii rights reserved.