Some models for the adsorption kinetics of pesticides in soil

Leistra, M.; Dekkers, W.A.

doi:10.1080/03601237709372055

Cited by 10 publications

(3 citation statements)

References 8 publications

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“…The linear isotherm is usually valid for dissolved species that are present at concentrations less than one half of its solubility [ Lyman et al , 1992]. This isotherm was used to describe the sorption of pesticides [ Leistra and Dekkers , 1977; Hornsby and Davidson , 1973] as well as some organics [ Davidson and Chang , 1972]. The Freundlich model is describing the reversible nonlinear kinetic sorption, and it was successfully used to describe the sorption of phosphate [ Fiskell et al , 1979] and herbicides [ Enfield and Bledsoe , 1975].…”

Section: Model Descriptionmentioning

confidence: 99%

Subsurface contaminant transport in the presence of colloids: Effect of nonlinear and nonequilibrium interactions

Bekhit

Hassan

2007

Water Resources Research

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[1] The effect of kinetic nonlinear sorption of contaminants in the presence of colloids is the focus of this study. Different sorption isotherms are considered where contaminant sorption and colloid deposition are assumed to be linear or nonlinear (Freundlich), and contaminant attachment to mobile and immobile colloids is assumed to follow either linear or Langmuir isotherms. Varying combinations accounting for different possibilities are used to investigate effects of different isotherms on contaminant transport. Twodimensional numerical simulations in homogenous media show that the effect of colloids on nonlinearly sorbing contaminant is altered from facilitation to retardation depending on the Freundlich exponent and concentration value. One finding from the study indicates that incorporating the colloid effect on contaminant transport does not necessarily represent a conservative assumption. The study shows that ignoring the fact that colloids have limited sites and describing contaminant attachment to colloids by linear isotherms may lead to inaccurate results. In addition, it is found that assuming colloids are linearly deposited on the solid matrix is a conservative assumption in the applications that focus on peak concentration arrival. However, when small contaminant concentrations are of concern (i.e., early arrival is the quantity of interest), assuming nonlinear colloidal deposition becomes the critical scenario.

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Section: Model Descriptionmentioning

confidence: 99%

Subsurface contaminant transport in the presence of colloids: Effect of nonlinear and nonequilibrium interactions

Bekhit

Hassan

2007

Water Resources Research

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“…Evidence for and discussion of these concepts have been presented by a variety of researchers (Davidson & C hang 1972;D avidson & M cD ougal 1973;Leistra & Deckkers 1977;M cCall & Agin 1985;R ao el al. 1974;V an G enuchten & W ierenga 1976;W u & Geschwend 1986).…”

Section: The Futurementioning

confidence: 99%

Probability modelling

Laskowski¹,

Tillotson²,

Fontaine³

et al. 1990

Phil. Trans. R. Soc. Lond. B

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This paper traces the development of modelling to assess the environmental fate of agricultural chemicals within DowElanco's Environmental Fate Group. Field monitoring of late was the initial tool for assessment, but inefficiency of the process and poor data interpretability turned the group's attention to benchmarking. This, too, proved to be an inadequate and frustrating process as it evaluated fate only relative to other chemicals and did not allow in an absolute sense the assessment of risk of contamination away from treated locations. It also did not allow the evaluation of management programmes for minimization of environmental impact. Currently, probability modelling is being evaluated to assess the environmental fate of chemicals and the likelihood of attaining a given concentration at a specified site. It allows the handling of variability and provides estimates of likelihood for environmental events to take place in designated areas of the United States. Through the use of Fourier Amplitude Sensitivity Test and Monte Carlo sampling techniques, ranges of inputs are used to drive environmental models to provide frequency distribution data for output. The process appears useful for assessing environmental impact of chemicals because it allows whole range evaluation with data that are readily available, and provides information appropriate for best management practices.

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“…The influence of the silt/water ratio on K p in 24 h sorption experiments at a fixed c a , according to Eq (15). …”

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confidence: 99%

Sorption‐desorption kinetics of some organochlorine insecticides in silt‐water suspensions

Noegrohati

Hammers

1992

Toxicological & Environmental Chemistry

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Kinetic (batch) sorption and desorption experiments for some organochlorine insecticides in silt-water suspensions are described. The effect of possible experimental artifacts on the results is examined. The influence of the silt/water ratio on the linear sorption coefficient and on the "nonextractable" solute fraction is determined. The sorption process is described in terms of some kinetic models.

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Some models for the adsorption kinetics of pesticides in soil

Cited by 10 publications

References 8 publications

Subsurface contaminant transport in the presence of colloids: Effect of nonlinear and nonequilibrium interactions

Subsurface contaminant transport in the presence of colloids: Effect of nonlinear and nonequilibrium interactions

Probability modelling

Sorption‐desorption kinetics of some organochlorine insecticides in silt‐water suspensions

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