Moon, JW Goltz, MN Ahn, KH Park, JW 2024-01-21T09:32:44Z 2024-01-21T09:32:44Z 2021-09-01 2003-02 0169-7722 https://pubs.kist.re.kr/handle/201004/138893 In order to contain the movement of organic contaminants in groundwater, a subsurface sorption barrier consisting of sand or clay minerals coated with a cationic surfactant has been proposed. The effectiveness of such a sorption barrier might be affected by the presence of dissolved organic matter (DOM) in the groundwater. To study the impact of DOM on barrier performance, a series of batch experiments were,performed by measuring naphthalene and phenanthrene sorption onto sand coated with cetylpyridinium. chloride (CPC) and bentonite coated with hexadecyltrimethylammonium bromide (HDTMA) in the presence of various concentrations of DOM. The overall soilwater distribution coefficient (K*) of naphthalene and phenanthrene onto CPC-coated sand decreased with increasing DOM concentration, whereas the K* of the compounds onto HDTMA-coated bentonite slightly increased with increasing DOM concentration. To describe the overall distribution of polycyclic aromatic hydrocarbons (PAHs) in the systems, a competitive multiphase sorption (CMS) model was developed and compared with an overall mechanistic sorption (OMS) model. The modeling studies showed that while the OMS model did not explain the CPC-coated sand experimental results, a model that included competitive sorption between DOM and PAH did. The experimental results and the modeling study indicated that there was no apparent competition between DOM and PAH in the HDTMA-coated bentonite system, and indicated that in groundwater systems with high DOM, a barrier using HDTMA-coated bentonite might be more effective. (C) 2002 Elsevier Science B.V. All rights reserved. English ELSEVIER SCIENCE BV WATER SOLUBILITY ENHANCEMENTS HUMIC SUBSTANCES COMPETITIVE SORPTION NONIONIC SURFACTANT POROUS-MEDIA BINDING CONTAMINANTS PHENANTHRENE CLAYS MODEL Dissolved organic matter effects on the performance of a barrier to polycyclic aromatic hydrocarbon transport by groundwater Article 10.1016/S0169-7722(02)00084-0 1 JOURNAL OF CONTAMINANT HYDROLOGY, v.60, no.3-4, pp.307 - 326 JOURNAL OF CONTAMINANT HYDROLOGY 60 3-4 307 326 scie scopus 000180412200008 2-s2.0-0037292332 Environmental Sciences Geosciences, Multidisciplinary Water Resources Environmental Sciences & Ecology Geology Water Resources Article WATER SOLUBILITY ENHANCEMENTS HUMIC SUBSTANCES COMPETITIVE SORPTION NONIONIC SURFACTANT POROUS-MEDIA BINDING CONTAMINANTS PHENANTHRENE CLAYS MODEL surfactant immobilization dissolved organic matter polycyclic aromatic hydrocarbons distribution coefficient