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Applied and Environmental Microbiology, June 2003, p. 3288-3298, Vol. 69, No. 6
0099-2240/03/$08.00+0     DOI: 10.1128/AEM.69.6.3288-3298.2003
Copyright © 2003, American Society for Microbiology. All Rights Reserved.

Assessment of Bioavailability of Soil-Sorbed Atrazine

Jeong-Hun Park,1,2 Yucheng Feng,3* Pingsheng Ji,3 Thomas C. Voice,1 and Stephen A. Boyd2

Department of Civil and Environmental Engineering,1 Department of Crop and Soil Sciences, Michigan State University, East Lansing, Michigan 48824,2 Department of Agronomy and Soils, Auburn University, Auburn, Alabama 368493

Received 16 October 2002/ Accepted 4 March 2003

Bioavailability of pesticides sorbed to soils is an important determinant of their environmental fate and impact. Mineralization of sorbed atrazine was studied in soil and clay slurries, and a desorption-biodegradation-mineralization (DBM) model was developed to quantitatively evaluate the bioavailability of sorbed atrazine. Three atrazine-degrading bacteria that utilized atrazine as a sole N source (Pseudomonas sp. strain ADP, Agrobacterium radiobacter strain J14a, and Ralstonia sp. strain M91-3) were used in the bioavailability assays. Assays involved establishing sorption equilibrium in sterile soil slurries, inoculating the system with organisms, and measuring the CO2 production over time. Sorption and desorption isotherm analyses were performed to evaluate distribution coefficients and desorption parameters, which consisted of three desorption site fractions and desorption rate coefficients. Atrazine sorption isotherms were linear for mineral and organic soils but displayed some nonlinearity for K-saturated montmorillonite. The desorption profiles were well described by the three-site desorption model. In many instances, the mineralization of atrazine was accurately predicted by the DBM model, which accounts for the extents and rates of sorption/desorption processes and assumes biodegradation of liquid-phase, but not sorbed, atrazine. However, for the Houghton muck soil, which manifested the highest sorbed atrazine concentrations, enhanced mineralization rates, i.e., greater than those expected on the basis of aqueous-phase atrazine concentration, were observed. Even the assumption of instantaneous desorption could not account for the elevated rates. A plausible explanation for enhanced bioavailability is that bacteria access the localized regions where atrazine is sorbed and that the concentrations found support higher mineralization rates than predicted on the basis of aqueous-phase concentrations. Characteristics of high sorbed-phase concentration, chemotaxis, and attachment of cells to soil particles seem to contribute to the bioavailability of soil-sorbed atrazine.

* Corresponding author. Mailing address: Department of Agronomy and Soils, Auburn University, Auburn, AL 36849. Phone: (334) 844-3967. Fax: (334) 844-3945. E-mail: yfeng{at}acesag.auburn.edu.

Applied and Environmental Microbiology, June 2003, p. 3288-3298, Vol. 69, No. 6
0099-2240/03/$08.00+0     DOI: 10.1128/AEM.69.6.3288-3298.2003
Copyright © 2003, American Society for Microbiology. All Rights Reserved.



This article has been cited by other articles:

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  • Sharer, M., Park, J.-H., Voice, T. C., Boyd, S. A. (2003). Time Dependence of Chlorobenzene Sorption/Desorption by Soils. Soil Sci. 67: 1740-1745 [Abstract] [Full Text]  


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