Mineralization of 2,4-D, mecoprop, isoproturon and terbuthylazine in a chalk aquifer

Gitte B. Kristensen, Sebastian R. Sørensen, Jens Aamand

Publikation: Bidrag til tidsskriftArtikelForskningpeer review

28 Citationer (Scopus)

Abstrakt

The potential to mineralize 2,4-dichlorophenoxyacetic acid (2,4-D), mecoprop, isoproturon and terbuthylazine was studied in soil and aquifer chalk sampled at an agricultural field near Aalborg, Denmark. Laboratory microcosms were incubated for 258 days under aerobic conditions at 10°C with soil and chalk from 0.15-4.45m below the surface. The [ring-U-14C]-labeled herbicides were added to obtain a concentration of 6 μg kg-1 and mineralization was measured as evolved [14C]carbon dioxide. The herbicides were readily mineralized in soil from the plough layer, except for terbuthylazine, which was mineralized only to a limited extent. In the chalk, lag periods of at least 40 days were observed, and a maximum of 51%, 33% and 6% of the added 2,4-D, mecoprop and isoproturon, respectively, were recovered as [14C]carbon dioxide. Large variations in both rate and extent of mineralization were observed within replicates in chalk. No mineralization of terbuthylazine in chalk was observed. As a measure of the general metabolic activity towards aromatic compounds, [ring-U-14C]-benzoic acid was included. It was readily mineralized at all depths.

OriginalsprogEngelsk
Sider (fra-til)531-536
Antal sider6
TidsskriftPest Management Science
Vol/bind57
Udgave nummer6
DOI
StatusUdgivet - jun. 2001

Emneord

  • Pesticide
  • chalk
  • Degradation

Programområde

  • Programområde 2: Vandressourcer

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