Effect of organic amendments on herbicide sorption as related to the nature of the dissolved organic matter
It has been assessed the influence of four organic amendments (OA) consisting of two commercial humic amendments (liquid LF and solid SF) from olive-mill wastes, a solid urban waste (SUW), and a sewage sludge (SS) on the sorption properties and leaching potential of simazine and 2,4-D. A sandy soil (TR) and a sandy-clay soil with a relatively high montmorillonite content (A) were treated with the diverse OA. Dissolved organic matter (DOM) was extracted from the amendments, the soils, and the amended soils and studied by fluorescence spectroscopy. A humification index (HIX) was calculated from the fluorescence data. Sorption was determined with the batch technique. Spectroscopical studies revealed that the DOM of the LF differs from the other OA by having a very low ability to absorb and to fluoresce and by its very low HIX values, which indicates that the LF contains large amounts of nonhumified material and consists of small molecules. On the other hand, the SF amendment contains the highest amounts of highly humified material and a large number of carboxylic groups. Amended soils sorbed simazine and 2,4-D to a greater extent than the untreated soils, except in the case of simazine sorption in the LF amended soil A, which had a lower simazine sorption than the original soil. The small molecules of DOM in the LF compete with simazine for montmorillonite sorption sites in soil A. This is not the case for 2,4-D, since this herbicide does not sorb on montmorillonite. In the case of the soil TR, with a lower montmorillonite content, there is no competition between simazine and the LF molecules for sorption sites. Soils amended with the highly humified SF were the best sorbents for simazine but not for 2,4-D, which can be attributed to repulsion between negatively charged 2,4-D molecules and COOgroups, which are more abundant in SF.
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American Chemical Society
2000
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dig-irnas-es-10261-610012018-09-10T11:22:45Z Effect of organic amendments on herbicide sorption as related to the nature of the dissolved organic matter Cox, L. Celis, R. Hermosín, M.C. Cornejo, J. Zsolnay, A. Zeller, K. Junta de Andalucía Comisión Interministerial de Ciencia y Tecnología, CICYT (España) Ministerio de Educación y Cultura (España) German Academic Exchange Service European Science Foundation It has been assessed the influence of four organic amendments (OA) consisting of two commercial humic amendments (liquid LF and solid SF) from olive-mill wastes, a solid urban waste (SUW), and a sewage sludge (SS) on the sorption properties and leaching potential of simazine and 2,4-D. A sandy soil (TR) and a sandy-clay soil with a relatively high montmorillonite content (A) were treated with the diverse OA. Dissolved organic matter (DOM) was extracted from the amendments, the soils, and the amended soils and studied by fluorescence spectroscopy. A humification index (HIX) was calculated from the fluorescence data. Sorption was determined with the batch technique. Spectroscopical studies revealed that the DOM of the LF differs from the other OA by having a very low ability to absorb and to fluoresce and by its very low HIX values, which indicates that the LF contains large amounts of nonhumified material and consists of small molecules. On the other hand, the SF amendment contains the highest amounts of highly humified material and a large number of carboxylic groups. Amended soils sorbed simazine and 2,4-D to a greater extent than the untreated soils, except in the case of simazine sorption in the LF amended soil A, which had a lower simazine sorption than the original soil. The small molecules of DOM in the LF compete with simazine for montmorillonite sorption sites in soil A. This is not the case for 2,4-D, since this herbicide does not sorb on montmorillonite. In the case of the soil TR, with a lower montmorillonite content, there is no competition between simazine and the LF molecules for sorption sites. Soils amended with the highly humified SF were the best sorbents for simazine but not for 2,4-D, which can be attributed to repulsion between negatively charged 2,4-D molecules and COOgroups, which are more abundant in SF. This project has been supported by Junta de Andalucía through Research group 4092, CICYT through AMB96-0445- CO2-O2, the Deutsher Akademischer Austauschdienst and Ministerio de Educación y Cultura through Acciones Integradas HA98-0072, and by the European Science Foundation within its Groundwater Pollution Program (G-Poll). Municipal treatment plant EMASESA is also acknowledged for providing the sewage sludge. Peer Reviewed 2012-11-23T12:16:21Z 2012-11-23T12:16:21Z 2000 2012-11-23T12:16:21Z artículo http://purl.org/coar/resource_type/c_6501 doi: 10.1021/es0000293 issn: 0013-936X e-issn: 1520-5851 Environmental Science and Technology 34(21): 4600- 4605 (2000) http://hdl.handle.net/10261/61001 10.1021/es0000293 http://dx.doi.org/10.13039/501100007273 http://dx.doi.org/10.13039/501100001655 http://dx.doi.org/10.13039/501100000782 http://dx.doi.org/10.13039/501100011011 en open American Chemical Society |
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It has been assessed the influence of four organic amendments (OA) consisting of two commercial humic amendments (liquid LF and solid SF) from olive-mill wastes, a solid urban waste (SUW), and a sewage sludge (SS) on the sorption properties and leaching potential of simazine and 2,4-D. A sandy soil (TR) and a sandy-clay soil with a relatively high montmorillonite content (A) were treated with the diverse OA. Dissolved organic matter (DOM) was extracted from the amendments, the soils, and the amended soils and studied by fluorescence spectroscopy. A humification index (HIX) was calculated from the fluorescence data. Sorption was determined with the batch technique. Spectroscopical studies revealed that the DOM of the LF differs from the other OA by having a very low ability to absorb and to fluoresce and by its very low HIX values, which indicates that the LF contains large amounts of nonhumified material and consists of small molecules. On the other hand, the SF amendment contains the highest amounts of highly humified material and a large number of carboxylic groups. Amended soils sorbed simazine and 2,4-D to a greater extent than the untreated soils, except in the case of simazine sorption in the LF amended soil A, which had a lower simazine sorption than the original soil. The small molecules of DOM in the LF compete with simazine for montmorillonite sorption sites in soil A. This is not the case for 2,4-D, since this herbicide does not sorb on montmorillonite. In the case of the soil TR, with a lower montmorillonite content, there is no competition between simazine and the LF molecules for sorption sites. Soils amended with the highly humified SF were the best sorbents for simazine but not for 2,4-D, which can be attributed to repulsion between negatively charged 2,4-D molecules and COOgroups, which are more abundant in SF. |
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Junta de Andalucía |
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Junta de Andalucía Cox, L. Celis, R. Hermosín, M.C. Cornejo, J. Zsolnay, A. Zeller, K. |
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Cox, L. Celis, R. Hermosín, M.C. Cornejo, J. Zsolnay, A. Zeller, K. |
spellingShingle |
Cox, L. Celis, R. Hermosín, M.C. Cornejo, J. Zsolnay, A. Zeller, K. Effect of organic amendments on herbicide sorption as related to the nature of the dissolved organic matter |
author_sort |
Cox, L. |
title |
Effect of organic amendments on herbicide sorption as related to the nature of the dissolved organic matter |
title_short |
Effect of organic amendments on herbicide sorption as related to the nature of the dissolved organic matter |
title_full |
Effect of organic amendments on herbicide sorption as related to the nature of the dissolved organic matter |
title_fullStr |
Effect of organic amendments on herbicide sorption as related to the nature of the dissolved organic matter |
title_full_unstemmed |
Effect of organic amendments on herbicide sorption as related to the nature of the dissolved organic matter |
title_sort |
effect of organic amendments on herbicide sorption as related to the nature of the dissolved organic matter |
publisher |
American Chemical Society |
publishDate |
2000 |
url |
http://hdl.handle.net/10261/61001 http://dx.doi.org/10.13039/501100007273 http://dx.doi.org/10.13039/501100001655 http://dx.doi.org/10.13039/501100000782 http://dx.doi.org/10.13039/501100011011 |
work_keys_str_mv |
AT coxl effectoforganicamendmentsonherbicidesorptionasrelatedtothenatureofthedissolvedorganicmatter AT celisr effectoforganicamendmentsonherbicidesorptionasrelatedtothenatureofthedissolvedorganicmatter AT hermosinmc effectoforganicamendmentsonherbicidesorptionasrelatedtothenatureofthedissolvedorganicmatter AT cornejoj effectoforganicamendmentsonherbicidesorptionasrelatedtothenatureofthedissolvedorganicmatter AT zsolnaya effectoforganicamendmentsonherbicidesorptionasrelatedtothenatureofthedissolvedorganicmatter AT zellerk effectoforganicamendmentsonherbicidesorptionasrelatedtothenatureofthedissolvedorganicmatter |
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