Journal
ENVIRONMENTAL POLLUTION
Volume 126, Issue 3, Pages 417-423Publisher
ELSEVIER SCI LTD
DOI: 10.1016/S0269-7491(03)00233-1
Keywords
metsulfuron-methyl; bound residue; bioavailability; phytotoxicity; degradation
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The bioavailability and phytotoxicity of bound residues of metsulfuron-inethyl were Studied using C-14-labeling and bioassay with oil rape (Brassica napus L.). Soil bound residues at the concentration of 0.27 and 0.53 nmol g(-1) resulted in significant inhibition of oil rape seedling growth. The biologically active component of the bound residues was identified to be metsulfuron-methyl parent compound. Other metabolites, including the hydrolysis product 2-methylformate-benzenesulfonamide, showed no toxicity to the test species. This study suggests that residues of metsulfuron-methyl bound previously to the soil matrix could be again released upon planting. The phytotoxicity of metsulfuron-methyl bound residues was mainly caused by the metsulfuron-methyl parent compound that became available during plant growth. (C) 2003 Elsevier Ltd. All rights reserved.
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