A diffusive gradients in thin-films technique for the assessment of bisphenols desorption from soils

Guan, Dong-Xing and Zheng, Jian-Lun and Luo, Jun and Zhang, Hao and Davison, William and Ma, Lena Q. (2017) A diffusive gradients in thin-films technique for the assessment of bisphenols desorption from soils. Journal of Hazardous Materials. ISSN 0304-3894

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Abstract

Abstract Desorption/adsorption of bisphenols (BPs) in soils affects their mobility and availability. However, the kinetics of these processes have not been well studied, due to the lack of appropriate means of measurement. Diffusive gradients in thin-films (DGT) technique can assess kinetic processes in soils and have recently been developed for measuring three BPs (BPA, BPB and BPF). DGT was deployed for 2.5 h to 20 d in five soils with different soil properties. Non-linear increase in mass accumulation by DGT with time indicated poor resupply of BPs from soil solid to solution phase. By fitting the data with DIFS (DGT-induced fluxes in soils) model, values for the labile partition coefficient (Kdl), response time (tc) and rates of exchange (k1 and k-1) of BPs between soil solid and solution phases were obtained. The derived values of Kdl showed that most of the BPs in the soil could participate in labile exchange. Average response times of 1–2 h implied that the supply of BPs to DGT was limited by their desorption rate. Soils with more binding sites (higher DOM, CEC and Fe oxides) could resupply BPs more quickly, highlighting the danger of just considering partition effects.

Item Type:
Journal Article
Journal or Publication Title:
Journal of Hazardous Materials
Additional Information:
This is the author’s version of a work that was accepted for publication in Journal of Hazardous Materials. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Journal of Hazardous Materials, ??, ??, 2017 DOI: 10.1016/j.jhazmat.2017.02.053
Uncontrolled Keywords:
/dk/atira/pure/subjectarea/asjc/2300/2311
Subjects:
ID Code:
84963
Deposited By:
Deposited On:
28 Feb 2017 16:56
Refereed?:
Yes
Published?:
Published
Last Modified:
19 Sep 2020 04:30