title: Atrazine and terbutryn degradation in deposits from groundwater environment within the boreal region in Lahti, Finland.
abstract: The degradation of pesticides atrazine and terbutryn was investigated under aerobic and anaerobic conditions in the northern boreal region subsurface deposits and sterilized controls from the depths of 6.3-21.0 m below the surface and 1.2-16.9 m below the groundwater table. During 1.3-1.7 years of laboratory incubation, atrazine degradation under aerobic conditions varied from rapid (half-live 38 days) to no degradation. Anaerobically, atrazine half-lives were 430-829 days. Organic matter, nitrogen, and lead in deposits correlated positively with the atrazine concentration in groundwater. Aerobic and anaerobic terbutryn half-lives were 193-644 and 266-400 days, respectively. Microbial aerobic atrazine and terbutryn degradation was confirmed in the deep deposits near the water table. Under aerobic conditions, the high amounts of Cr, Mn, Ni, and Zn in deposits decreased the chemical degradation of terbutryn.
authors.affiliation: Department of Ecological and Environmental Sciences, University of Helsinki, Niemenkatu 73, 15140 Lahti, Finland. marja.talja@helsinki.fi
authors.forename: K Marja
authors.initials: KM
authors.lastname: Talja
authors.forename: Sanna
authors.initials: S
authors.lastname: Kaukonen
authors.forename: Johanna
authors.initials: J
authors.lastname: Kilpi-Koski
authors.forename: Ismo
authors.initials: I
authors.lastname: Malin
authors.forename: Timo
authors.initials: T
authors.lastname: Kairesalo
authors.forename: Martin
authors.initials: M
authors.lastname: Romantschuk
authors.forename: Jari
authors.initials: J
authors.lastname: Tuominen
authors.forename: Merja H
authors.initials: MH
authors.lastname: Kontro
mesh_terms: D001280:Atrazine / Q000032:analysis / Q000378:metabolism*; D001419:Bacteria / Q000378:metabolism*; D001673:Biodegradation, Environmental; D005387:Finland; D006540:Herbicides / Q000032:analysis / Q000378:metabolism*; D014227:Triazines / Q000032:analysis / Q000378:metabolism*; D014874:Water Pollutants, Chemical / Q000032:analysis / Q000378:metabolism*
chemical_list: D006540:Herbicides; D014227:Triazines; D014874:Water Pollutants, Chemical; D001280:Atrazine; C010347:terbutryne