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@article{1805179,
author = {Rizzuto, Simone and Jones, Kevin C. and Zhang, Hao and Baho, Didier L. and Leu, Eva and Nizzetto, Luca},
article_location = {OXFORD},
article_number = {December 2021},
doi = {http://dx.doi.org/10.1016/j.chemosphere.2021.131524},
keywords = {Natural dissolved organic matter; Isoproturon; Equilibrium-based method; DOM-contaminants binding},
language = {eng},
issn = {0045-6535},
journal = {Chemosphere},
title = {Critical assessment of an equilibrium-based method to study the binding of waterborne organic contaminants to natural dissolved organic matter (DOM)},
url = {https://www.sciencedirect.com/science/article/pii/S0045653521019962?via%3Dihub},
volume = {285},
year = {2021}
}
TY - JOUR
ID - 1805179
AU - Rizzuto, Simone - Jones, Kevin C. - Zhang, Hao - Baho, Didier L. - Leu, Eva - Nizzetto, Luca
PY - 2021
TI - Critical assessment of an equilibrium-based method to study the binding of waterborne organic contaminants to natural dissolved organic matter (DOM)
JF - Chemosphere
VL - 285
IS - December 2021
SP - 1-12
EP - 1-12
PB - PERGAMON-ELSEVIER SCIENCE LTD
SN - 00456535
KW - Natural dissolved organic matter
KW - Isoproturon
KW - Equilibrium-based method
KW - DOM-contaminants binding
UR - https://www.sciencedirect.com/science/article/pii/S0045653521019962?via%3Dihub
N2 - Dissolved organic matter (DOM) can play a major role in determining availability of pollutants to aquatic biota. Equilibrium dialysis is the most commonly used method to assess the interaction between DOM and organic contaminants. However, results obtained through this method can be affected by confounding factors linked to the diffusion of DOM through the membrane or the interaction of DOM and/or the compounds with the membrane itself. In this study, we propose an improved experimental approach, where highly hydrophilic celluloseester membranes with small molecular cut-off (100-500 Da) were used to overcome some of these hindrances. The performance of the method to determine the binding of a commonly used moderately hydrophobic herbicide (Isoproturon - ISU) with natural DOM was critically evaluated through a set of quality assurance criteria, across a range of DOM concentrations and pH conditions. DOM trans-membrane diffusion was prevented by the smaller pore size of the dialysis membrane. Good measurement reproducibility, mass balance closure, and successful trans-membrane equilibrium of ISU were obtained. ISU showed relatively low affinity with DOM (log KDOC 1-2 L g-1), which was significantly influenced by varying pH and DOM concentration. An alternative membrane may be needed for higher pH conditions as the greater adsorption effect blurred the observation of trans-membrane equilibrium and confounding mass balance closure. The paper makes recommendations on how to avoid measurement artefacts, while considering criteria for the expected mass distribution of compounds at equilibrium and for sorption onto the membrane and surfaces of the experimental units.
ER -
RIZZUTO, Simone, Kevin C. JONES, Hao ZHANG, Didier L. BAHO, Eva LEU a Luca NIZZETTO. Critical assessment of an equilibrium-based method to study the binding of waterborne organic contaminants to natural dissolved organic matter (DOM). \textit{Chemosphere}. OXFORD: PERGAMON-ELSEVIER SCIENCE LTD, 2021, roč.~285, December 2021, s.~1-12. ISSN~0045-6535. Dostupné z: https://dx.doi.org/10.1016/j.chemosphere.2021.131524.
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