Sorption of acidic organic solute onto kaolinitic soils from methanol-water mixtures
- Authors
- Kim, Juhee; Kim, Minhee; Hyun, Seunghun; Kim, Jeong-Gyu; Ok, Yong Sik
- Issue Date
- 2012
- Publisher
- TAYLOR & FRANCIS INC
- Keywords
- 1-Napthoic acid; cosolvency; sorption; kaolinitic soil
- Citation
- JOURNAL OF ENVIRONMENTAL SCIENCE AND HEALTH PART B-PESTICIDES FOOD CONTAMINANTS AND AGRICULTURAL WASTES, v.47, no.1, pp.22 - 29
- Indexed
- SCIE
SCOPUS
- Journal Title
- JOURNAL OF ENVIRONMENTAL SCIENCE AND HEALTH PART B-PESTICIDES FOOD CONTAMINANTS AND AGRICULTURAL WASTES
- Volume
- 47
- Number
- 1
- Start Page
- 22
- End Page
- 29
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/109434
- DOI
- 10.1080/03601234.2012.601949
- ISSN
- 0360-1234
- Abstract
- The fate of the acidic organic solute from the soil-water-solvent system is not well-understood. In this study, the effect of the acidic functional group of organic solute in the sorption from cosolvent system was evaluated. The sorption of naphthalene (NAP) and 1-naphthoic acid (1-NAPA) by three kaolinitic soils and two model sorbents (kaolinite and humic acid) were measured as functions of the methanol volume fractions (f(c) <= 0.4) and ionic compositions (CaCl2 and KCl). The solubility of 1-NAPA was also measured in various ionic compositions. The sorption data were interpreted using the cosolvency-induced sorption model. The K-m values (= the linear sorption coefficient) of NAP with kaolinitic soil for both ionic compositions was log linearly decreased with f(c). However, the Km values of 1-NAPA with both ionic compositions remained relatively constant over the f(c) range. For the model sorbent, the Km values of 1-NAPA with kaolinite for the KCl system and with humic acid for both ionic compositions decreased with f(c), while the sorption of 1-NAPA with kaolinite for the CaCl2 system was increased with f(c). From the solubility data of 1-NAPA with f(c), no significant difference was observed with the different ionic compositions, indicating an insignificant change in the aqueous activity of the liquid phase. In conclusion, the enhanced 1-NAPA sorption, greater than that predicted from the cosolvency-induced model, was due to an untraceable interaction between the carboxylate and hydrophilic soil domain in the methanol-water system. Therefore, in order to accurately predict the environmental fate of acidic pesticides and organic solutes, an effort to quantitatively incorporate the enhanced hydrophilic sorption into the current cosolvency-induced sorption model is required.
- Files in This Item
- There are no files associated with this item.
- Appears in
Collections - College of Life Sciences and Biotechnology > Division of Environmental Science and Ecological Engineering > 1. Journal Articles
Items in ScholarWorks are protected by copyright, with all rights reserved, unless otherwise indicated.