Accelerated degradation of aldicarb and its oxidation products in previously treated soils |
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| Institution: | 1. Graduate School of Bioagricultural Sciences, Nagoya University, Furo-cho, Chikusa-ku, Nagoya, Aichi 464-8601, Japan;2. Graduate School of Agriculture, Meiji University, 1-1-1 Higashi-Mita, Kawasaki, Kanagawa 214-8571, Japan;1. Department of Biological Mechanisms and Functions, Graduate School of Bioagricultural Sciences, Nagoya University, Furo-cho, Chikusa, Nagoya, Aichi 464-8601, Japan;2. Graduate School of Engineering, Toyo University, 2100 Kujirai, Kawagoe, Saitama 350-8585, Japan;1. School of Biological and Chemical Engineering, Panzhihua University, Panzhihua 617000, China;2. Beijing Advanced Innovation Center for Soft Matter Science and Engineering, Beijing University of Chemical Technology, Beijing 100029, China;3. Medical College, Panzhihua University, Panzhihua 617000, China;4. Key Laboratory of Green Chemistry of Sichuan Institutes of Higher Education, Sichuan University of Science & Engineering, Zigong 643000, China |
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| Abstract: | The persistence of aldicarb, aldicarb sulphoxide and aldicarb sulphone was studied in soils used for crops grown commercially and in experimental soils with different histories of treatment with a granular formulation of aldicarb. Total aldicarb residues declined more rapidly in incubations in all the previously treated soils (initial 50% loss in 5–17 days at 15°C) than in the corresponding untreated soils (initial 50% loss in 25–50 days). This was largely because of more rapid breakdown of aldicarb sulphoxide and, to a lesser extent, of aldicarb sulphone. Accelerated degradation was induced more readily by pretreatment with carbofuran than with aldicarb or thiofanox and seemed to be influenced at least as much by dose level as by frequency of pretreatment. It is concluded that rotation of chemical usage should suppress development of the phenomenon with commercially recommended doses of aldicarb but that the potential for cross-enhancement is still little understood. |
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