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Models for assessing the volatilization of herbicides applied to flooded rice fields



Models for assessing the volatilization of herbicides applied to flooded rice fields



Chemosphere 15(2): 127-138



Volatilization rates of MCPA [(2-methyl-4-chlorophenoxyacetic acid], thiobencarb, and molinate from water were calculated using the EXAMS aquatic fate computer model, and measured in a laboratory chamber and in flooded rice fields. A fair to good correlation was obtained between EXAMS-calculated and chamber-measured rates for all three herbicides. Field-measured values correlated well with chamber-measured rates for thiobencarb and molinate. For MCPA, field-measured values were much higher than expected for volatilization from water alone. In this case, the presence of plant and other surface residues in the field made the major contribution to observed volatilization. For MCPA, 4-chloro-o-cresol flux was comparable to that of the parent herbicide.

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Accession: 001637560

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DOI: 10.1016/0045-6535(86)90564-3



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