Re-analysis of experiments to quantify irreversibility of pesticide sorption-desorption in soil

Laura Suddaby; Sabine Beulke; Wendy van Beinum; Rafael Celis; William Koskinen; Colin David Brown

doi:10.1021/jf304422n

Re-analysis of experiments to quantify irreversibility of pesticide sorption-desorption in soil

Laura Suddaby, Sabine Beulke, Wendy van Beinum, Rafael Celis, William Koskinen, Colin David Brown

Environment and Geography

Research output: Contribution to journal › Article › peer-review

Abstract

Previously published research has used an isotope-exchange technique to measure irreversibility of pesticide adsorption-desorption in soil. Results indicated significant irreversibility (6-51%) in sorption in five pesticide-soil systems measured over 72 hours. Here, we propose a three-site model to re-analyse the experimental data. The model adds a slow but reversible binding on non-equilibrium sorption sites in addition to instantaneously reversible sites and irreversible sites. The model was able to match experimental data very closely, but only if irreversible sorption was assumed to be absent. Observed asymmetry in the binding of 12C- and 14C-pesticide was explained on the basis of non-attainment of sorption equilibrium over the study period. Results suggest that irreversible sorption may be less significant than previously considered with important implications for understanding the fate of pesticides in applied to soil.

Original language	English
Pages (from-to)	2033-2038
Number of pages	6
Journal	Journal of Agricultural and Food Chemistry
Volume	61
Issue number	9
DOIs	https://doi.org/10.1021/jf304422n
Publication status	Published - 6 Mar 2013

Access to Document

10.1021/jf304422n

http://pubs.acs.org/doi/abs/10.1021/jf304422n

Cite this

@article{aec3df8821a146f096e72022cef8a536,

title = "Re-analysis of experiments to quantify irreversibility of pesticide sorption-desorption in soil",

abstract = "Previously published research has used an isotope-exchange technique to measure irreversibility of pesticide adsorption-desorption in soil. Results indicated significant irreversibility (6-51%) in sorption in five pesticide-soil systems measured over 72 hours. Here, we propose a three-site model to re-analyse the experimental data. The model adds a slow but reversible binding on non-equilibrium sorption sites in addition to instantaneously reversible sites and irreversible sites. The model was able to match experimental data very closely, but only if irreversible sorption was assumed to be absent. Observed asymmetry in the binding of 12C- and 14C-pesticide was explained on the basis of non-attainment of sorption equilibrium over the study period. Results suggest that irreversible sorption may be less significant than previously considered with important implications for understanding the fate of pesticides in applied to soil.",

author = "Laura Suddaby and Sabine Beulke and {van Beinum}, Wendy and Rafael Celis and William Koskinen and Brown, {Colin David}",

year = "2013",

month = mar,

day = "6",

doi = "10.1021/jf304422n",

language = "English",

volume = "61",

pages = "2033--2038",

journal = "Journal of Agricultural and Food Chemistry",

issn = "1520-5118",

publisher = "American Chemical Society",

number = "9",

}

TY - JOUR

T1 - Re-analysis of experiments to quantify irreversibility of pesticide sorption-desorption in soil

AU - Suddaby, Laura

AU - Beulke, Sabine

AU - van Beinum, Wendy

AU - Celis, Rafael

AU - Koskinen, William

AU - Brown, Colin David

PY - 2013/3/6

Y1 - 2013/3/6

N2 - Previously published research has used an isotope-exchange technique to measure irreversibility of pesticide adsorption-desorption in soil. Results indicated significant irreversibility (6-51%) in sorption in five pesticide-soil systems measured over 72 hours. Here, we propose a three-site model to re-analyse the experimental data. The model adds a slow but reversible binding on non-equilibrium sorption sites in addition to instantaneously reversible sites and irreversible sites. The model was able to match experimental data very closely, but only if irreversible sorption was assumed to be absent. Observed asymmetry in the binding of 12C- and 14C-pesticide was explained on the basis of non-attainment of sorption equilibrium over the study period. Results suggest that irreversible sorption may be less significant than previously considered with important implications for understanding the fate of pesticides in applied to soil.

AB - Previously published research has used an isotope-exchange technique to measure irreversibility of pesticide adsorption-desorption in soil. Results indicated significant irreversibility (6-51%) in sorption in five pesticide-soil systems measured over 72 hours. Here, we propose a three-site model to re-analyse the experimental data. The model adds a slow but reversible binding on non-equilibrium sorption sites in addition to instantaneously reversible sites and irreversible sites. The model was able to match experimental data very closely, but only if irreversible sorption was assumed to be absent. Observed asymmetry in the binding of 12C- and 14C-pesticide was explained on the basis of non-attainment of sorption equilibrium over the study period. Results suggest that irreversible sorption may be less significant than previously considered with important implications for understanding the fate of pesticides in applied to soil.

UR - http://www.scopus.com/inward/record.url?scp=84874874585&partnerID=8YFLogxK

U2 - 10.1021/jf304422n

DO - 10.1021/jf304422n

M3 - Article

SN - 1520-5118

VL - 61

SP - 2033

EP - 2038

JO - Journal of Agricultural and Food Chemistry

JF - Journal of Agricultural and Food Chemistry

IS - 9

ER -

Re-analysis of experiments to quantify irreversibility of pesticide sorption-desorption in soil

Abstract

Access to Document

Other files and links

Cite this