Dissipation and metabolism of C-spiroxamine in soil under laboratory condition |
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Authors: | Premasis Sukul |
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Institution: | Institute of Environmental Research (INFU), TU Dortmund, Otto-Hahn-Strasse 6, 44221 Dortmund, Germany |
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Abstract: | Spiroxamine SPX] belongs to a spiroketalamine group of substances. The biodegradation of 1,3-dioxolane-4-14C]-SPX has been examined in 2 soils of different physicochemical properties. The total recovery of radioactivity from soils was 98.6-103.5% of that applied. The total amount of extractable radioactivity declined with a simultaneous increase in non-extractable radioactivity. Volatile organics were detected at lower levels; however, mineralization played a marked effect on the route of SPX dissipation. The half-life ranges between 37 and 44 d. SPX does not undergo any enantioselective degradation. 4 metabolites: despropyl-SPX, desethyl-SPX, SPX N-oxide and SPX acid were identified, applying mass spectrometric technique. Sorption-desorption data fitted well with a Freundlich model in log form (r2, 0.99). KDsorp ranged between 44 and 230, suggesting SPX ought to be considered as a substance with low leaching potential groundwater ubiquity score (GUS), <1.8]. Furthermore, an overall low desorption of 1-11% indicates firm retention of SPX by the soils. |
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Keywords: | Persistence Spiroxamine Fungicide Half-life Sorption Radioactive distribution |
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