13C NMR spectroscopy as a tool for the characterization of anthropogenic soils and of their impact on sorption of organic pollutants
Meeting celebrado del 6-11 de abril, de 2003, en Niza, Francia.
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2003-04
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dig-irnas-es-10261-833082018-09-12T11:46:52Z 13C NMR spectroscopy as a tool for the characterization of anthropogenic soils and of their impact on sorption of organic pollutants Abelmann, Kerstin Kleineidam, Sybille Knicker, Heike Grathwohl, P. Kögel-Knabner, I. Meeting celebrado del 6-11 de abril, de 2003, en Niza, Francia. Detailed information about structure, composition and sorption parameters of organic sorbents is required to understand the sorption behavior of hydrophobic organic compounds (HOC). The molecular structure and composition of the organic material (OM) from different types of geosorbents was characterized by solid-state 13C NMR spectroscopy and related to Freundlich sorption isotherms. The geosorbents included natural and combusted coals, peat and various mineral soils. Anthropogenic soils, containing carbonaceous OM, were of special interest. Equilibrium sorption isotherms were measured for five hydrophobic organic compounds (benzene, tetrachloroethylene, 1,2-dichlorobenzene, 1,4-dichlorobenzene and phenanthrene) and analyzed with the solubility normalized Freundlich sorption isotherm. The Freundlich sorption coefficients were normalized to the organic carbon content (KOC°-values). Structural parameters of the OM, i.e. aromaticity, fraction of alkyl carbon, and polarity, were determined by the VACP/MAS 13C NMR technique. The aromaticity increased with a decreasing proportion of polar compounds. In particular some anthropogenic soils exhibited a low polarity but a high aromaticity. Within the coals and the anthropogenic soils increasing aromatic carbon was accompanied by decreasing alkyl carbon. The structural parameters allowed to differentiate between natural mineral and anthropogenic soils and to verify the presence of carbonaceous material in the anthropogenic soils. A distinct positive correlation between KOC°-values and aromaticity was found. The highest sorption capacities were observed for samples with a high proportion of carbonaceous material as detected by the VACP/MAS technique. A negative correlation between Freundlich exponent (1/n) and aromaticity was obtained. This showed that with increasing proportion of aromatic carbon adsorption processes become more pronounced, whereas the contribution of partitioning decreases. Large amounts of carbonaceous OM as included in some anthropogenic soils, caused dominating adsorption, whereas partitioning determines the HOC sorption of OM containing a high proportion of polar compounds. Peer reviewed 2013-10-04T10:29:57Z 2013-10-04T10:29:57Z 2003-04 comunicación de congreso http://purl.org/coar/resource_type/c_5794 Abstracts Meeting. EGS - AGU - EGU Joint Assembly: (2003) http://hdl.handle.net/10261/83308 en none European Geosciences Union |
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English |
| description |
Meeting celebrado del 6-11 de abril, de 2003, en Niza, Francia. |
| format |
comunicación de congreso |
| author |
Abelmann, Kerstin Kleineidam, Sybille Knicker, Heike Grathwohl, P. Kögel-Knabner, I. |
| spellingShingle |
Abelmann, Kerstin Kleineidam, Sybille Knicker, Heike Grathwohl, P. Kögel-Knabner, I. 13C NMR spectroscopy as a tool for the characterization of anthropogenic soils and of their impact on sorption of organic pollutants |
| author_facet |
Abelmann, Kerstin Kleineidam, Sybille Knicker, Heike Grathwohl, P. Kögel-Knabner, I. |
| author_sort |
Abelmann, Kerstin |
| title |
13C NMR spectroscopy as a tool for the characterization of anthropogenic soils and of their impact on sorption of organic pollutants |
| title_short |
13C NMR spectroscopy as a tool for the characterization of anthropogenic soils and of their impact on sorption of organic pollutants |
| title_full |
13C NMR spectroscopy as a tool for the characterization of anthropogenic soils and of their impact on sorption of organic pollutants |
| title_fullStr |
13C NMR spectroscopy as a tool for the characterization of anthropogenic soils and of their impact on sorption of organic pollutants |
| title_full_unstemmed |
13C NMR spectroscopy as a tool for the characterization of anthropogenic soils and of their impact on sorption of organic pollutants |
| title_sort |
13c nmr spectroscopy as a tool for the characterization of anthropogenic soils and of their impact on sorption of organic pollutants |
| publisher |
European Geosciences Union |
| publishDate |
2003-04 |
| url |
http://hdl.handle.net/10261/83308 |
| work_keys_str_mv |
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