Degradation of herbicides in two sandy aquifers under different redox conditions

Lise Larsen, Jens Aamand

Publikation: Bidrag til tidsskriftArtikelForskningpeer review

38 Citationer (Scopus)


We examined the potential for complete degradation (mineralisation) of the four [ring-U-14C]herbicides mecoprop, isoproturon, atrazine, and metsulphuron-methyl in two sandy aquifers representing aerobic, denitrifying, sulphate-reducing, and methanogenic conditions. Slurries with sediment and groundwater were set-up aerobically or anaerobically in the presence of the electron-acceptor prevailing at the sampling site, amended with 25 μg 1-1 herbicide, and incubated ar 10°C. Considerable mineralisation was only observed in sediment from the plough layer incubated aerobically. Here, 30% of 14C-mecoprop was recovered as 14CO2 after 15 days and 15% of isoproturon was recovered as 14CO2 after 267 days. Only 7% of mecoprop was recovered as 14CO2 after 313 days in sediment from the aquifer below sampled ar 1.95-3.00 mbs (m below the surface). In denitrifying and methanogenic slurries, 3% of 14C added as mecoprop was recovered as 14CO2. Isoproturon was not mineralised except in the aerobic plough layer, and atrazine and metsulphuron-methyl were not mineralised under any of the conditions applied.

Sider (fra-til)231-236
Antal sider6
Udgave nummer2
StatusUdgivet - jul. 2001


  • Pesticide
  • Degradation
  • groundwater


  • Programområde 2: Vandressourcer


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