TY - JOUR
T1 - Mineralization of 2,4-D, mecoprop, isoproturon and terbuthylazine in a chalk aquifer
AU - Kristensen, Gitte B.
AU - Sørensen, Sebastian R.
AU - Aamand, Jens
PY - 2001/6
Y1 - 2001/6
N2 - 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.
AB - 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.
KW - Aquifer
KW - Chalk
KW - Herbicides
KW - Mineralization
KW - Soil
KW - Pesticide
KW - chalk
KW - Degradation
UR - http://www.scopus.com/inward/record.url?scp=0034988006&partnerID=8YFLogxK
U2 - 10.1002/ps.315
DO - 10.1002/ps.315
M3 - Article
C2 - 11407030
AN - SCOPUS:0034988006
VL - 57
SP - 531
EP - 536
JO - Pest Management Science
JF - Pest Management Science
SN - 1526-498X
IS - 6
ER -