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Desorption of Pyrene from Freshly-Amended and Aged Soils and its Relationship to Bioaccumulation in Earthworms

Desorption of Pyrene from Freshly-Amended and Aged Soils and its Relationship to Bioaccumulation... Desorption of pyrene was studied in freshly-amended and 120 d-aged samples of six different soils using a Tenax-assisted method in order to evaluate the influence of soil properties and aging time on desorption. The correlations between desorption percentage (P d ), rapid desorption rate constant (k rap ), and biota to soil accumulation factor (BSAF) were analyzed. Results showed that in soils with a relatively high soil organic matter (SOM) content (> 1% in this study), P d and k rap decreased with the increase of SOM content both in freshly amended and aged soils. This suggests that SOM is the key component for sorption organic pollutants by providing highly active combination sites, where the combined pollutant becomes difficult to desorb. In soils with a relatively low SOM content (< 1%), clay minerals played an important role through offering nanopores to entrap pollutant molecules, making it difficult for these molecules to diffuse out. Aging significantly reduced the rate and extent of pyrene desorption. It is reasonable to deduce that, during aging, some of the pyrene molecules moved from “readily desorbing sites” to “relatively slower desorbing sites,” which led to a reduction of desorption. Ln P d showed a linear relationship with ln BSAF for both freshly-amended and aged soils, and ln k rap only in aged soils. In freshly-amended soils, rapid desorption in some soils is too quick to be the limiting step for bioaccumulation, and, therefore, the elevation BSAF became insignificant when k rap was larger than 3 × 10 − 3 h − 1 . http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Soil and Sediment Contamination Taylor & Francis

Desorption of Pyrene from Freshly-Amended and Aged Soils and its Relationship to Bioaccumulation in Earthworms

Li, Junguo; Sun, Hongwen; Zhang, Yu
Soil and Sediment Contamination , Volume 16 (1): 9 – Jan 1, 2007
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References (22)

Publisher
Taylor & Francis
Copyright
Copyright Taylor & Francis Group, LLC
ISSN
1549-7887
eISSN
1532-0383
DOI
10.1080/15320380601079665
Publisher site
See Article on Publisher Site

Abstract

Desorption of pyrene was studied in freshly-amended and 120 d-aged samples of six different soils using a Tenax-assisted method in order to evaluate the influence of soil properties and aging time on desorption. The correlations between desorption percentage (P d ), rapid desorption rate constant (k rap ), and biota to soil accumulation factor (BSAF) were analyzed. Results showed that in soils with a relatively high soil organic matter (SOM) content (> 1% in this study), P d and k rap decreased with the increase of SOM content both in freshly amended and aged soils. This suggests that SOM is the key component for sorption organic pollutants by providing highly active combination sites, where the combined pollutant becomes difficult to desorb. In soils with a relatively low SOM content (< 1%), clay minerals played an important role through offering nanopores to entrap pollutant molecules, making it difficult for these molecules to diffuse out. Aging significantly reduced the rate and extent of pyrene desorption. It is reasonable to deduce that, during aging, some of the pyrene molecules moved from “readily desorbing sites” to “relatively slower desorbing sites,” which led to a reduction of desorption. Ln P d showed a linear relationship with ln BSAF for both freshly-amended and aged soils, and ln k rap only in aged soils. In freshly-amended soils, rapid desorption in some soils is too quick to be the limiting step for bioaccumulation, and, therefore, the elevation BSAF became insignificant when k rap was larger than 3 × 10 − 3 h − 1 .

Journal

Soil and Sediment Contamination – Taylor & Francis

Published: Jan 1, 2007

Keywords: Desorption; biota to soil accumulation factor; aging; pyrene

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