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Sorption of PAHs by Soil Humins and Effect of Soil Inorganic Matrixs  

Lim, Dong-Min (Department of Environmental Engineering, Seoul National University of Technology)
Lee, Seung-Sik (Department of Environmental Engineering, Seoul National University of Technology)
Shin, Hyun-Sang (Department of Environmental Engineering, Seoul National University of Technology)
Publication Information
Journal of Korean Society of Environmental Engineers / v.28, no.12, 2006 , pp. 1337-1346 More about this Journal
Abstract
Soil humin is the insoluble fraction of humic materials and play an important roles in the irreversible sorption of hydrophobic organic contaminants onto soil particles. However, there have been limited knowledge about the sorption and chemical properties of humin due to the difficulties in its separation from the inorganic matrix(mainly clays and oxides). In this study, de-ashed soil humins($Hu_1-Hu_6$) were isolated from a soil residues(Crude Hu) after removing alkali-soluble organic fractions followed by consecutive dissolution of the mineral matrix with 2%-HF for 2 hr. The humin samples were characterized by elemental analysis and $^{13}C$ NMR spectroscopic method and their sorption-desorption behavior for 1-naphthol were investigated from aqueous solution. The results were compared one another and that with peat humin. $^{13}C$ NMR spectra features indicate that the soil humin molecules are mainly made up of aliphatic carbons(>80% in total carbon) including carbohydrate, methylene chain. Freundlich sorption parameter, n was increased from 0.538 to 0.697 and organic carbon-normalized sorption coefficient(log $K_{OC}$) values also increased from 2.43 to 2.74 as inorganic matrix of the soil humin removed by HF de-ashing. The results suggest that inorganic phase in humin plays an important, indirect role in 1-naphthol sorption and the effects on the sorption non-linearity and intensity are analyzed by comparison between the results of soil humin and peat humin. Sorption-desorption hysteresis were also observed in all the humin samples and hysteresis index(HI) at low solute concentration($C_e$=0.1 mg/L) are in order of Peat humin(2.67)>De-ashed humin(0.74)>Crude Hu(0.59).
Keywords
Sorption-Desorption; Soil Humin; 1-Naphthol; Hysteresis; $^{13}C$ NMR; $K_{OC}$;
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Times Cited By KSCI : 1  (Citation Analysis)
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