Journal
ENVIRONMENTAL POLLUTION
Volume 168, Issue -, Pages 29-36Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.envpol.2012.04.022
Keywords
Ethidimuron; Methabenzthiazuron; Anilazine; Persistence; Bound residues
Categories
Funding
- Bayer Crop Science
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The fate of the C-14-labeled herbicides ethidimuron (ETD), methabenzthiazuron (MBT), and the fungicide anilazine (ANI) in soils was evaluated after long-term aging (9-17 years) in field based lysimeters subject to crop rotation. Analysis of residual C-14 activity in the soils revealed 19% (ETD soil; 0-10 cm depth), 35% (MBT soil; 0-30), and 43% (ANI soil; 0-30) of the total initially applied. Accelerated solvent extraction yielded 90% (ETD soil), 26% (MBT soil), and 41% (ANI soil) of residual pesticide C-14 activity in the samples. LC-MS/MS analysis revealed the parent compounds ETD and MBT, accounting for 3% and 2% of applied active ingredient in the soil layer, as well as dihydroxy-anilazine as the primary ANI metabolite. The results for ETD and MBT were matching with values obtained from samples of a 12 year old field plot experiment. The data demonstrate the long-term persistence of these pesticides in soils based on outdoor trials. (c) 2012 Published by Elsevier Ltd.
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