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| Sorption of 2,4-Dinitrotoluene to Black Soil Components |
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| KeyWord:2,4-dinitrotoluene; sorption ; organic matter; clay minerals |
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| Abstract: |
| Selecting 2,4-dinitrotoluene（2,4-DNT） as a toxic nitro-pollutant representative and black soil as a typical soil representative, the sorption of 2,4-DNT in various samples such as original soil, humic and fulvic acids free soil and organic fractions free soil samples were investigated by batch sorption experiments. We further studied sorption of 2,4-DNT in inorganic mineral fractions saturated and exchanged with cesium ion, and the relative contributions of the organic and inorganic components of soil to sorption of 2,4-DNT were investigated. Results showed that, comparing with adsorption of 2,4-DNT to original soil, removing mainly humic and fulvic acids of black soil had little influence on the sorption of 2,4-DNT, however, complete removal of the organic fraction decreased the sorption by nearly an order of magnitude. This indicated that non-NaOH extractable organic fraction（humin/kerogen and black carbon）of black soil was considered to be the dominant factors to the sorption of 2,4-DNT. The sorption mechanisms were quite different for apolar compound 1,3-DCB and polar compound 2,4-DNT. Sorption of 1,3-DCB was dominated by hydrophobic effect, however, non-hydrophobic sorption was driving forces for sorption of 2,4-DNT. Otherwise, inorganic mineral component in black soil was not the predominant component that contribute to the overall sorption of 2,4-DNT. Only when inorganic mineral was saturated with weakly hydrated cesium ion, 2,4-DNT showed strong adsorption affinity to inorganic mineral. |
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