Kinetics and equilibria of the interactions between diethylhexyl phthalate and sediment particles in simulated estuarine systems

Zhou, JL; Liu, YP

Kinetics and equilibria of the interactions between diethylhexyl phthalate and sediment particles in simulated estuarine systems

Zhou, JL

Liu, YP

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Publication Type:: Journal Article
Citation:: Marine Chemistry, 2000, 71 (1-2), pp. 165 - 176
Issue Date:: 2000-07-01

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Field	Value	Language
dc.contributor.author	Zhou, JL https://orcid.org/0000-0003-1393-1608	en_US
dc.contributor.author	Liu, YP	en_US
dc.date.issued	2000-07-01	en_US
dc.identifier.citation	Marine Chemistry, 2000, 71 (1-2), pp. 165 - 176	en_US
dc.identifier.issn	0304-4203	en_US
dc.identifier.uri	http://hdl.handle.net/10453/33823
dc.description.abstract	The sorption of diethylhexyl phthalate (DEHP) by sediment particles has been studied under simulated estuarine conditions, using freshwater and seawater samples collected from the Conwy Estuary, North Wales. The sorption process was rapid, reaching a sorption equilibrium within 6 h at a sediment concentration (SC) of 2.16 g l-1. With an increase in SC, it took longer for the sorption equilibrium to be reached. The sorption equilibrium can be adequately described by the linear partition model at low equilibrium aqueous concentrations. The sorption of DEHP was enhanced in the presence of salts, due to the salting out effect, and a salting constant of 1.156 l mol-1 was obtained. The sorption coefficient of DEHP decreased with increasing SC, from 1.28 x 104 ml g-1 at 0.1 g l-1 SC to 6.75 x 103 ml g-1 at 14.66 g l-1 SC, due to the presence of colloidal particles in suspension which were able to bind DEHP. This third phase was quantified by measuring its dry weight, which was found to increase with increasing SC. The effect of colloids on DEHP sorption was studied by correcting the observed partition coefficients based on the concentration of colloid particles, and the true partition coefficients obtained (1.61 x 104 ± 1.29 x 103 ml g-1) were found to show much smaller variations than apparent partition coefficient (9.37 X 103 ± 2.12 x 103 ml g-1) at different SCs. Furthermore, the true organic carbon-normalised partition coefficients for the two sediments with different organic carbon content became similar and relatively independent of SCs. (C) 2000 Published by Elsevier Science B.V.	en_US
dc.relation.ispartof	Marine Chemistry	en_US
dc.relation.isbasedon	10.1016/S0304-4203(00)00047-5	en_US
dc.subject.classification	Oceanography	en_US
dc.title	Kinetics and equilibria of the interactions between diethylhexyl phthalate and sediment particles in simulated estuarine systems	en_US
dc.type	Journal Article
utslib.citation.volume	1-2	en_US
utslib.citation.volume	71	en_US
utslib.for	0399 Other Chemical Sciences	en_US
utslib.for	0402 Geochemistry	en_US
utslib.for	0405 Oceanography	en_US
pubs.embargo.period	Not known	en_US
pubs.organisational-group	/University of Technology Sydney
pubs.organisational-group	/University of Technology Sydney/Faculty of Engineering and Information Technology
pubs.organisational-group	/University of Technology Sydney/Faculty of Engineering and Information Technology/School of Civil and Environmental Engineering
pubs.organisational-group	/University of Technology Sydney/Strength - CTWW - Centre for Technology in Water and Wastewater Treatment
utslib.copyright.status	closed_access
pubs.issue	1-2	en_US
pubs.publication-status	Published	en_US
pubs.volume	71	en_US

Abstract:

The sorption of diethylhexyl phthalate (DEHP) by sediment particles has been studied under simulated estuarine conditions, using freshwater and seawater samples collected from the Conwy Estuary, North Wales. The sorption process was rapid, reaching a sorption equilibrium within 6 h at a sediment concentration (SC) of 2.16 g l-1. With an increase in SC, it took longer for the sorption equilibrium to be reached. The sorption equilibrium can be adequately described by the linear partition model at low equilibrium aqueous concentrations. The sorption of DEHP was enhanced in the presence of salts, due to the salting out effect, and a salting constant of 1.156 l mol-1 was obtained. The sorption coefficient of DEHP decreased with increasing SC, from 1.28 x 104 ml g-1 at 0.1 g l-1 SC to 6.75 x 103 ml g-1 at 14.66 g l-1 SC, due to the presence of colloidal particles in suspension which were able to bind DEHP. This third phase was quantified by measuring its dry weight, which was found to increase with increasing SC. The effect of colloids on DEHP sorption was studied by correcting the observed partition coefficients based on the concentration of colloid particles, and the true partition coefficients obtained (1.61 x 104 ± 1.29 x 103 ml g-1) were found to show much smaller variations than apparent partition coefficient (9.37 X 103 ± 2.12 x 103 ml g-1) at different SCs. Furthermore, the true organic carbon-normalised partition coefficients for the two sediments with different organic carbon content became similar and relatively independent of SCs. (C) 2000 Published by Elsevier Science B.V.

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http://hdl.handle.net/10453/33823