Aged soil column leaching of emamectin benzoate (MAB1a)
1998
O'Grodnick, J.S. | Wislocki, P.G. | Reynolds, J.L. | Wisocky, M. | Robinson, R.A.
The mobility of [14C]emamectin bezoate (MAB1a) and its photochemically and metabolically produced soil degradates was examined in four different agricultural soils. Microbially active soils were treated with [14C]MAB1a and irradiated in a photolysis unit. Irradiated soil samples were applied to soil columns, which were eluted with calcium chloride solution. The majority of the radioactivity (77-93%) remained in the irradiated soil placed on the surface of the top of the column. The 6 cm soil segments immediately below this soil contained 5.1-8.8% of the initially applied radioactivity. Extracts of soil segments below the applied soil plug did not show the presence of MAB1a or degradates having structures with the intact avermectin ring. The total amount of applied radioactivity found in the leachate ranged from 3.5 to 5.4%. In addition, 0.9-1.4% of the initially applied radiolabel present in the leachates could be partitioned into ethyl acetate. The leachate extracts were separated into four degradate fractions, none of which exceeded 0.001 ppm (1.5% of the initial radioactivity). The leachate did not contain any MAB1a or materials having the avermectin ring intact.
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