Extracted Humic Substances - Beyond the Long-Term Enviromental Record of Molecular Data
Comunicación oral presentada en Soil Science Society of America International Soils Meeting 6-9 Jan. (2019) San Diego CA.
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| Format: | comunicación de congreso biblioteca |
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Soil Science Society of America
2019-01-07
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| Online Access: | http://hdl.handle.net/10261/204904 |
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dig-irnas-es-10261-2049042020-03-25T02:09:31Z Extracted Humic Substances - Beyond the Long-Term Enviromental Record of Molecular Data Knicker, Heike Almendros Martín, Gonzalo González-Pérez, José Antonio Rosa Arranz, José M. de la González-Vila, Francisco Javier Comunicación oral presentada en Soil Science Society of America International Soils Meeting 6-9 Jan. (2019) San Diego CA. The insight of extracted humic substances (EHSs) is currently under debate. This is not a new situation; its chemical nature has been under discussion from the origins of the humus chemistry. The novelty consists mainly of applying a more rigorous criterion, denying its real existence in nature. There is no doubt that isolated, purified humic acid preparations have not the same structural arrangement than organic matter in the soil environment. Since they represent only the extractable fractions of the latter, they certainly cannot be used to accurately quantify the C sequestration potential of soils. In addition, their oxygencontaining functional groups, their groups responsible for hydrophobic and charge transfer interactions, and their stable free radicals are not interacting, or attached, as before to the constituents of the soil matrix. In the isolated preparations, they are contributing to a self-assembled structure not necessarily >supramolecular> but consisting of a hierarchy of links completely altered as regards that existing in the natural soil. Although the physical structure of humic acids is modified, their chemical composition may display variations with respect to total soil organic matter, which depend more on selective extraction than on structural alterations. On the other hand, being soluble in aqueous solutions and containing a considerable amount of reactive groups, they are predestinated for studying interaction of soil organic matter with metals, pollutants and even with soil minerals. However, since they are operationally rather than chemically defined, structural differences among the extracts from different sources are expected. Therefore, with the contribution, we like to summarize selected studies on how source defines the structure of EHS (i.e. fossil sediments or burnt soils), suggesting that their typical characteristics are not necessarily due to chemical transformations during extraction. Further, we will discuss which environmental information can be gained from their molecular characterization. 2020-03-24T09:00:56Z 2020-03-24T09:00:56Z 2019-01-07 2020-03-24T09:00:56Z comunicación de congreso http://purl.org/coar/resource_type/c_5794 Extracted Humic Substances - Beyond the Long-Term Enviromental Record of Molecular Data (Comunicación oral) (2019) http://hdl.handle.net/10261/204904 Sí none Soil Science Society of America |
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| description |
Comunicación oral presentada en Soil Science Society of America International Soils Meeting 6-9 Jan. (2019) San Diego CA. |
| format |
comunicación de congreso |
| author |
Knicker, Heike Almendros Martín, Gonzalo González-Pérez, José Antonio Rosa Arranz, José M. de la González-Vila, Francisco Javier |
| spellingShingle |
Knicker, Heike Almendros Martín, Gonzalo González-Pérez, José Antonio Rosa Arranz, José M. de la González-Vila, Francisco Javier Extracted Humic Substances - Beyond the Long-Term Enviromental Record of Molecular Data |
| author_facet |
Knicker, Heike Almendros Martín, Gonzalo González-Pérez, José Antonio Rosa Arranz, José M. de la González-Vila, Francisco Javier |
| author_sort |
Knicker, Heike |
| title |
Extracted Humic Substances - Beyond the Long-Term Enviromental Record of Molecular Data |
| title_short |
Extracted Humic Substances - Beyond the Long-Term Enviromental Record of Molecular Data |
| title_full |
Extracted Humic Substances - Beyond the Long-Term Enviromental Record of Molecular Data |
| title_fullStr |
Extracted Humic Substances - Beyond the Long-Term Enviromental Record of Molecular Data |
| title_full_unstemmed |
Extracted Humic Substances - Beyond the Long-Term Enviromental Record of Molecular Data |
| title_sort |
extracted humic substances - beyond the long-term enviromental record of molecular data |
| publisher |
Soil Science Society of America |
| publishDate |
2019-01-07 |
| url |
http://hdl.handle.net/10261/204904 |
| work_keys_str_mv |
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