Abstract
Environmental black carbon (BC) in soils and sediments has received increasing attention due to the sorption for organic chemicals and the potentials for carbon sequestration. In this work, pyrene sorption to humic acid and BC fractions in sediment was investigated by using extracted humic acid and preheated sediment, respectively. Thermally labile organic matter was removed during preheating and the remaining fraction of organic carbon (OC) is recognized as BC. The comparison results highlighted the important role of BC in pyrene sorption, especially at low concentrations. In addition, the micro-porosity of pristine and preheated sediments was analyzed by CO2 sorption. The blocking effect of associated humic substances on the micro-pores of BC for CO2 sorption was not observed. On the contrary, the probed micro-pore volume was higher in the case of pristine sediment, which implies the sorption of CO2 molecules by humic substances.
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