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Title (Primary) Sorption of chlorimuron-ethyl on montmorillonite clays: effects of exchangeable cations, pH, and ionic strength
Author Ren, W.; Teng, Y.; Zhou, Q.; Paschke, A.; Schüürmann, G.;
Journal Environmental Science and Pollution Research
Year 2014
Department OEC;
Volume 21
Issue 19
Language englisch;
POF III (all) T41; T42;
UFZ wide themes RU3;
Abstract Sorption interaction of chlorimuron-ethyl with montmorillonite clays was investigated under varied types of exchangeable cation, pH, and ionic strength conditions. Chlorimuron-ethyl sorption on bentonites exhibited pronounced cation dependency, and the sorption ability increased as the sequence Ca2+- < Na+- < Al3+- < Fe3+-bentonite, due to different sorption mechanisms, whereas the cation dependency was influenced by the clay type and much weaker for montmorillonites. The decrease of pH at the range of 4.0–6.0 prominently increased sorption of chlorimuron-ethyl on all cation-exchanged montmorillonite clays, and nearly a neglected sorption (about 2 %) can be observed at pH over 7.0. In the presence of CaCl2, sorption of chlorimuron-ethyl on Fe3+-bentonite was promoted because of complexion of Ca2+ and the surface of Fe3+-bentonite. However, as the concentration of CaCl2 increased, chlorimuron-ethyl sorption on Ca2+- and Fe3+-exchanged bentonite decreased, suggesting that Ca bridging was not the prevailing mechanism for sorption of chlorimuron-ethyl on these clays. Furthermore, chlorimuron-ethyl sorption was relatively sensitive to pH, and the change of pH may obscure effect of other factors on the sorption, so it was quite necessary to control pH at a constant value when the effect of other factor was being studied.
ID 15435
Persistent UFZ Identifier https://www.ufz.de/index.php?en=20939&ufzPublicationIdentifier=15435
Ren, W., Teng, Y., Zhou, Q., Paschke, A., Schüürmann, G. (2014):
Sorption of chlorimuron-ethyl on montmorillonite clays: effects of exchangeable cations, pH, and ionic strength
Environ. Sci. Pollut. Res. 21 (19), 11587 - 11597