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Chemical and Spectroscopic Characterization of Soil Humic and Fulvic Acids and Sorption Coefficient of Phenanthrene: A Correlation Study  

Lee, Doo-Hee (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.30, no.11, 2008 , pp. 1067-1074 More about this Journal
Abstract
In this study, the organic carbon normalized-sorption coefficients (Koc) for the binding affinity of phenanthrene (PHE) to 16 different soil humic and fulvic acids of various origins were determined by fluorescence quenching. The humic and fulvic acids used in this study were isolated from 6 different domestic soils including Mt. Hanla soil, IHSS standard soil and peat as well as Aldrich humic acid and characterized by elemental composition, ultraviolet absorption at 254 nm, composition of main structural fragments determined by CPMAS $^{13}$C NMR. The Koc values($\times$10$^4$, L/kg C) for each of HA and FA samples were in the range of 1.48$\sim$8.65 and higher in HA compared to that of FA(3.13$\sim$8.65 vs 1.48$\sim$2.48) in the experimental condition([PHE]/[HS] = 0.02$\sim$0.2(mg/L)/(mg-OC/L), pH 6). The correlation study between the structural descriptors of humic and fulvic acids and log Koc values of phenanthrene, show that the magnitude of Koc values positively correlated with the UV$_{254}$ absorptivity([ABS]$_{254}$) and two $^{13}$C NMR descriptors (C$_{Ar-H,C}$, $\sum$C$_{Ar}$/$\sum$C$_{Alk}$), while negatively correlated with the independent descriptors of the(N+O)/C atomic ratios and $^{13}$C NMR descriptors (I$_{C-O}$/I$_{C-H,C}$). These results confirmed that the binding affinity for the hydrophobic organic compound, phenanthrene are significantly influenced by the polarity and aromaticity of soil humc and fulvic acids.
Keywords
Humic and Fulvic Acid; Polarity; UV Absorptivity; $^{13}$C NMR; Koc; Correlation Coefficient;
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