Aged Soil Column Leaching of Emamectin Benzoate (MAB1a)

The mobility of [14C]emamectin benzoate (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 soi...

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Bibliographic Details
Published in:Journal of agricultural and food chemistry 1998-05, Vol.46 (5), p.2044-2048
Main Authors: O'Grodnick, Joseph S, Wislocki, Peter G, Reynolds, JoAnne L, Wisocky, Matthew, Robinson, Robert A
Format: Article
Language:English
Subjects:
AGRICULTURAL SOILS
Agronomy. Soil science and plant productions
Applied sciences
AVERMECTINAS
AVERMECTINE
AVERMECTINS
BIODEGRADACION
BIODEGRADATION
Biological and medical sciences
Biological and physicochemical phenomena
Exact sciences and technology
FOTOLISIS
Fundamental and applied biological sciences. Psychology
INSECTICIDAS
INSECTICIDE
INSECTICIDES
IRRADIACION
IRRADIATED AGED SOILS
IRRADIATION
LEACHATES
LEACHING
LESSIVAGE DU SOL
LESSIVAT
LIXIVIACION
LIXIVIADOS
MICROBIAL DEGRADATION
Natural water pollution
PHOTOLYSE
PHOTOLYSIS
Pollution
RESIDU
RESIDUES
RESIDUOS
Soil and water pollution
Soil science
SOIL TYPES
SOL AGRICOLE
SUELOS AGRICOLAS
TIPOS DE SUELOS
TYPE DE SOL
Water treatment and pollution
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Summary:The mobility of [14C]emamectin benzoate (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. Keywords: Emamectin benzoate; MK-0244; irradiated aged leaching
ISSN:0021-8561
1520-5118
DOI:10.1021/jf970505h