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Mineralization of 2,4‐D, mecoprop, isoproturon and terbuthylazine in a chalk aquifer
Author(s) -
Kristensen Gitte B,
Sørensen Sebastian R,
Aamand Jens
Publication year - 2001
Publication title -
pest management science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.296
H-Index - 125
eISSN - 1526-4998
pISSN - 1526-498X
DOI - 10.1002/ps.315
Subject(s) - terbuthylazine , mecoprop , aquifer , mineralization (soil science) , environmental chemistry , environmental science , geology , atrazine , chemistry , groundwater , soil science , biology , pesticide , ecology , soil water , geotechnical engineering , mcpa
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 0.15–4.45 m below the surface. The [ ring‐U ‐ 14 C]‐labeled herbicides were added to obtain a concentration of 6 µg kg −1 and mineralization was measured as evolved [ 14 C]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 [ 14 C]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 ‐ 14 C]‐benzoic acid was included. It was readily mineralized at all depths. © 2000 Society of Chemical Industry