Effects of adsorption on degradation and bioavailability of metolachlor in soil

The ability of soil to adsorb metolachlor strongly influences its environmental fate, but little information is available on the correlation of its soil adsorption with degradation and bioavailability. The present study was conducted to characterize adsorption, degradation and bioavailability of met...

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Autores principales: Wu,X.M, Li,M, Long,Y.H, Liu,R.X, Yu,Y.L, Fang,H, Li,S.N
Lenguaje:English
Publicado: Chilean Society of Soil Science / Sociedad Chilena de la Ciencia del Suelo 2011
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Acceso en línea:http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-95162011000300007
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spelling oai:scielo:S0718-951620110003000072012-05-28Effects of adsorption on degradation and bioavailability of metolachlor in soilWu,X.MLi,MLong,Y.HLiu,R.XYu,Y.LFang,HLi,S.N : Metolachlor soil adsorption degradation bioavailability The ability of soil to adsorb metolachlor strongly influences its environmental fate, but little information is available on the correlation of its soil adsorption with degradation and bioavailability. The present study was conducted to characterize adsorption, degradation and bioavailability of metolachlor in five soils with different properties, and to investigate the effect of soil adsorption on degradation and bioavailability. Metolachlor was weakly adsorbed to the tested soils with adsorption coefficients ranging from 0.36 to1.18 &#956;g1-n mLn g-1, suggesting its potential to move downward with percolating water. Adsorption followed a Freundlich isotherm and was positively correlated with soil organic matter (OM) content (p < 0.01). Degradation of metolachlor in soils obeyed the first-order kinetics, yielding the half-life varying from 37.9 to 49.5 days, which was significantly influenced by soil OM content (p < 0.01). The prolonged half-life by sterilization indicated that biodegradation was the dominant pathway for metolachlor degradation in soils. Uptake and bioaccumulation of metolachlor in soils by Eisenia foetida was also mainly controlled by soil properties, especially OM. Adsorption coefficients were negatively related to half-lives (p < 0.01) and bioaccumulation factors (p < 0.05), indicating that adsorption coefficients might be useful for predicting degradation and bioavailability of metolachlor in soils.info:eu-repo/semantics/openAccessChilean Society of Soil Science / Sociedad Chilena de la Ciencia del SueloJournal of soil science and plant nutrition v.11 n.3 20112011-01-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-95162011000300007en10.4067/S0718-95162011000300007
institution Scielo Chile
collection Scielo Chile
language English
topic : Metolachlor
soil
adsorption
degradation
bioavailability
spellingShingle : Metolachlor
soil
adsorption
degradation
bioavailability
Wu,X.M
Li,M
Long,Y.H
Liu,R.X
Yu,Y.L
Fang,H
Li,S.N
Effects of adsorption on degradation and bioavailability of metolachlor in soil
description The ability of soil to adsorb metolachlor strongly influences its environmental fate, but little information is available on the correlation of its soil adsorption with degradation and bioavailability. The present study was conducted to characterize adsorption, degradation and bioavailability of metolachlor in five soils with different properties, and to investigate the effect of soil adsorption on degradation and bioavailability. Metolachlor was weakly adsorbed to the tested soils with adsorption coefficients ranging from 0.36 to1.18 &#956;g1-n mLn g-1, suggesting its potential to move downward with percolating water. Adsorption followed a Freundlich isotherm and was positively correlated with soil organic matter (OM) content (p < 0.01). Degradation of metolachlor in soils obeyed the first-order kinetics, yielding the half-life varying from 37.9 to 49.5 days, which was significantly influenced by soil OM content (p < 0.01). The prolonged half-life by sterilization indicated that biodegradation was the dominant pathway for metolachlor degradation in soils. Uptake and bioaccumulation of metolachlor in soils by Eisenia foetida was also mainly controlled by soil properties, especially OM. Adsorption coefficients were negatively related to half-lives (p < 0.01) and bioaccumulation factors (p < 0.05), indicating that adsorption coefficients might be useful for predicting degradation and bioavailability of metolachlor in soils.
author Wu,X.M
Li,M
Long,Y.H
Liu,R.X
Yu,Y.L
Fang,H
Li,S.N
author_facet Wu,X.M
Li,M
Long,Y.H
Liu,R.X
Yu,Y.L
Fang,H
Li,S.N
author_sort Wu,X.M
title Effects of adsorption on degradation and bioavailability of metolachlor in soil
title_short Effects of adsorption on degradation and bioavailability of metolachlor in soil
title_full Effects of adsorption on degradation and bioavailability of metolachlor in soil
title_fullStr Effects of adsorption on degradation and bioavailability of metolachlor in soil
title_full_unstemmed Effects of adsorption on degradation and bioavailability of metolachlor in soil
title_sort effects of adsorption on degradation and bioavailability of metolachlor in soil
publisher Chilean Society of Soil Science / Sociedad Chilena de la Ciencia del Suelo
publishDate 2011
url http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-95162011000300007
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