Submitted to: International Congress of Pesticide Chemistry Abstracts
Publication Type: Abstract Only
Publication Acceptance Date: 8/28/1993
Publication Date: N/A
Citation: Interpretive Summary:
Technical Abstract: A field experiment was conducted to determine the mass emission of methyl bromide into the atmosphere and the significance of each pathway of methyl bromide fate and transport. Included is a determination of the mass emission (i.e., volatilization rate) of methyl bromide from a tarped field during the 21-day experiment and a field-scale mass balance to quantify the partitioning of methyl bromide in agricultural systems. The mass balance was obtained by collecting a large number of soil samples before and after the experiment to ensure that the spatial distribution, the mean behavior, and the variance of the methyl bromide and Br ion concentrations at the field scale were adequately characterized. The bromide ion concentration was used to quantify methyl bromide degradation. The volatilization rate was determined by extensive sampling and determination of the atmospheric and soil vapor concentration as a function of distance from soil surface along with ancillary meteorological measurements. Flux chambers and the aerodynamic, the theoretical profile shape and integrated horizontal flux methods were used to calculate the methyl bromide flux.