Kinetics of leaching and binding of fumonisin B1 in soil microcosms
Williams, Lonnie Dwayne
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Fumonisin B1 (FB1) is a water-soluble mycotoxin produced by Fusarium verticillioides. Research objectives were to determine the leaching of FB1 through soil and FB1 binding in soil. Leachate and microcosm columns were used to determine the movement of FB1 through soil. FB1-contaminated corn screenings or water extracts containing FB1 were placed on the surface of soil columns. In 100% sand columns FB1 leaching was only slightly retarded, whereas, at 50%, 75% and 100% Cecil sandy loam, approximately 60%, 50% and 20% of the FB1 was recovered in the column leachate, respectively. The FB1 retained on the 100% Cecil sandy loam column was tightly bound. However, approximately 75% of the bound FB1 was released with 5% formic acid and 5% formic acid:acetonitrile (1:1) suggesting that binding was ionic. The results suggest that FB1 is quite stable in soils and, while tightly bound, under certain environmental conditions could be released.