The kinetics of sorption by retarded diffusion into soil aggregate pores

Environmental Science & Technology
Jaime VillaverdeColin D Brown

Abstract

This study investigates time-dependent sorption of pesticides in soil aggregates. We tested if the sorption kinetics of pesticides in soil aggregates can be described by modeling diffusion into aggregates for a range of soils and pesticides. Our hypothesis is that the rate of sorption is negatively related to sorption strength due to retardated diffusion. Natural aggregates of 3-5 mm diameter were separated from three soils: a clay, a silty clay loam, and a clay loam. The aggregates were stabilized with alginate gel, and adsorption of azoxystrobin, chlorotoluron, and atrazine was measured in batch experiments with eight equilibration times up to 28 days. Equilibrium sorption appeared to be reached within the 28-day period for each pesticide. An intra-aggregate diffusion model was employed to describe the increase of sorption with time. The model describes diffusion of the dissolved pesticides through the pore space inside the aggregates and sorption on internal surfaces. Sorption could be described by pore diffusion into the aggregates with diffusion coefficients between 0.5 x 10(-10) and 1.5 x 10(-10) m(2) s(-1). The model fits support the theory that pore diffusion is the rate-limiting process for sorption of pesticides in ag...Continue Reading

References

Jan 31, 2002·Journal of Contaminant Hydrology·T B Boving, P Grathwohl
Apr 12, 2003·Environmental Science & Technology·Johannes C L Meeussen
Aug 26, 2004·Environmental Pollution·A WalkerM J Mitchell
Nov 10, 2005·Journal of Agricultural and Food Chemistry·Wendy van BeinumColin D Brown
Feb 14, 2006·Environmental Science & Technology·Wendy van BeinumColin D Brown

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Citations

Sep 3, 2013·Journal of Hazardous Materials·Lizethly Cáceres-JensenVicente Castro-Castillo
Jun 9, 2011·Environmental Science & Technology·Samantha C YingScott Fendorf
Sep 20, 2011·Journal of Hazardous Materials·Fatima SopeñaEsmeralda Morillo
Dec 11, 2013·Pest Management Science·Anne ChevillardEmmanuelle Gastaldi
Dec 21, 2018·The Science of the Total Environment·Chi WuYongquan Zheng
Oct 17, 2020·International Journal of Pharmaceutics·E MorilloJ Villaverde
Jul 3, 2021·International Journal of Environmental Research and Public Health·Lizethly Cáceres-JensenBruno Loch-Arellano

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