PMID: 15382870Sep 24, 2004Paper

Intercorrelations among degree of geochemical alterations, physicochemical properties, and organic sorption equilibria of kerogen

Environmental Science & Technology
Chen YangGuoying Sheng


Recent studies reported that kerogen is an important natural organic material dominating sorption of relatively hydrophobic organic contaminants (HOCs) by topsoils and river sediments collected from industrialized regions. Due to its chemical and structural heterogeneity, kerogen is expected to exhibit a spectrum of sorptive phenomena for HOCs. The goal of this study is to establish correlations between heterogeneous physicochemical properties of kerogen and its sorptive characteristics for HOCs. In this study, we simulated diagenetic alterations under laboratory conditions by thermally treating a low-grade lignite at 200, 250, 300, 350, 400, 450, and 500 degrees C, yielding a series of type III kerogen samples having the same parental material but different maturations and physicochemical properties. The treated samples and the original lignite were systematically characterized using different methods and were used as the sorbents for sorption equilibrium study. The results of characterization revealed that black carbon or charwas formed at 450 degrees C or above and that, as the treatment temperature (T) increases, both O/C and H/C atomic ratios decrease whereas aromaticity and reflectance index increase. The sorption and des...Continue Reading


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