Mineralization of soil-aged isoproturon and isoproturon metabolites by Sphingomonas sp strain SRS2

Helle Johannesen, Sebastian R. Sørensen, Jens Aamand

Publikation: Bidrag til tidsskriftArtikelForskningpeer review

26 Citationer (Scopus)

Abstrakt

The aim of the study was to determine the effect of aging of the herbicide isoproturon and its metabolites monodesmethyl-isoproturon and 4-isopropyl-aniline in agricultural soil on their availability to the degrading bacterium Sphingomonas sp. strain SRS2. The 14C-ring-labeled isoproturon, monodesmethyl-isoproturon, and 4-isopropylaniline were added to sterilized soil and stored for 1, 49, 71, or 131 d before inoculation with strain SRS2. The availability of the compounds was estimated from the initial mineralization and the amount of 14CO 2 recovered after 120 d of incubation. Aging in soil for 131 d reduced the initial mineralization of isoproturon and monodesmethyl-isoproturon and, in the case of isoproturon, also reduced the recovery of 14CO 2. Initial mineralization and recovery of 14CO 2 from aged 4-isopropyl-aniline were slightly reduced, but less 14CO 2 was generally produced than with isoproturon or monodesmethyl-isoproturon. Thus, recovery of 14CO 2 from 14C-isoproturon and 14C-monodesmethyl-isoproturon was 50.7 to 64.4% of the initially added 14C, while recovery from 14C-4-isopropyl-aniline was only 11.7 to 17.0%. Sorption measurements revealed similar Freundlich constants (Kf) for isoproturon and monodesmethyl-isoproturon, whereas Kf for 4-isopropyl-aniline was more than fivefold greater. The findings imply that in soil, partial degradation of isoproturon to 4-isopropyl-aniline may lead to reduced mineralization of the herbicide due to sorption of the aniline moiety.

OriginalsprogEngelsk
Sider (fra-til)1250-1257
Antal sider8
TidsskriftJournal of Environmental Quality
Vol/bind32
Udgave nummer4
DOI
StatusUdgivet - jul. 2003

Programområde

  • Programområde 2: Vandressourcer

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