Thermogravimetric properties of aquatic humic substances
Humic substances from open ocean, coastal, estuarine and fluvial environments were characterized and compared on the basis of their thermogravimetric properties. Thermogravimetric analysis revealed between two and four degradation rate peaks that were used to quantify the different thermal behavior...
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Online Access: | http://hdl.handle.net/10773/5498 https://doi.org/10.1016/S0304-4203(98)00064-4 |
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ftria:oai:ria.ua.pt:10773/5498 2023-05-15T17:33:33+02:00 Thermogravimetric properties of aquatic humic substances Esteves, V. I. Duarte, A. C. 1999 http://hdl.handle.net/10773/5498 https://doi.org/10.1016/S0304-4203(98)00064-4 eng eng 0304-4203 http://hdl.handle.net/10773/5498 doi:10.1016/S0304-4203(98)00064-4 restrictedAccess thermogravimetry fulvic acids humic acids XAD4 fraction organic matter article 1999 ftria https://doi.org/10.1016/S0304-4203(98)00064-4 2022-05-25T18:31:59Z Humic substances from open ocean, coastal, estuarine and fluvial environments were characterized and compared on the basis of their thermogravimetric properties. Thermogravimetric analysis revealed between two and four degradation rate peaks that were used to quantify the different thermal behavior of three fractions of humic substances (humic acids, fulvic acids and XAD4 fractions). Humic acids are the most thermo-resistant (degradation temperature>300°C) while fulvic acids and the XAD4 fraction have some components that decompose at lower temperatures, and the XAD4 fraction has a high percentage of components that degrade at temperatures below 350°C. Thermogravimetric properties of humic substances appear to be related to their structural characteristics. In addition, the differences in shape of the thermogravimetric curves and their derivatives can give important clues about the origin of aquatic humic substances, which can be seen in marine fulvic acids that show a characteristic degradation rate peak at 150–170°C and in estuarine humic acids that show only two degradation peaks. CEE No. MAST-0019-C: Biogeochemical Carbon Cycling in Coastal Zones CEE MAS2-CT93-0065: Multidisciplinary Oceanographic Research in the Eastern Boundary of the North Atlantic MORENA Article in Journal/Newspaper North Atlantic Repositório Institucional da Universidade de Aveiro (RIA) Morena ENVELOPE(-67.121,-67.121,-68.580,-68.580) Marine Chemistry 63 3-4 225 233 |
institution |
Open Polar |
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Repositório Institucional da Universidade de Aveiro (RIA) |
op_collection_id |
ftria |
language |
English |
topic |
thermogravimetry fulvic acids humic acids XAD4 fraction organic matter |
spellingShingle |
thermogravimetry fulvic acids humic acids XAD4 fraction organic matter Esteves, V. I. Duarte, A. C. Thermogravimetric properties of aquatic humic substances |
topic_facet |
thermogravimetry fulvic acids humic acids XAD4 fraction organic matter |
description |
Humic substances from open ocean, coastal, estuarine and fluvial environments were characterized and compared on the basis of their thermogravimetric properties. Thermogravimetric analysis revealed between two and four degradation rate peaks that were used to quantify the different thermal behavior of three fractions of humic substances (humic acids, fulvic acids and XAD4 fractions). Humic acids are the most thermo-resistant (degradation temperature>300°C) while fulvic acids and the XAD4 fraction have some components that decompose at lower temperatures, and the XAD4 fraction has a high percentage of components that degrade at temperatures below 350°C. Thermogravimetric properties of humic substances appear to be related to their structural characteristics. In addition, the differences in shape of the thermogravimetric curves and their derivatives can give important clues about the origin of aquatic humic substances, which can be seen in marine fulvic acids that show a characteristic degradation rate peak at 150–170°C and in estuarine humic acids that show only two degradation peaks. CEE No. MAST-0019-C: Biogeochemical Carbon Cycling in Coastal Zones CEE MAS2-CT93-0065: Multidisciplinary Oceanographic Research in the Eastern Boundary of the North Atlantic MORENA |
format |
Article in Journal/Newspaper |
author |
Esteves, V. I. Duarte, A. C. |
author_facet |
Esteves, V. I. Duarte, A. C. |
author_sort |
Esteves, V. I. |
title |
Thermogravimetric properties of aquatic humic substances |
title_short |
Thermogravimetric properties of aquatic humic substances |
title_full |
Thermogravimetric properties of aquatic humic substances |
title_fullStr |
Thermogravimetric properties of aquatic humic substances |
title_full_unstemmed |
Thermogravimetric properties of aquatic humic substances |
title_sort |
thermogravimetric properties of aquatic humic substances |
publishDate |
1999 |
url |
http://hdl.handle.net/10773/5498 https://doi.org/10.1016/S0304-4203(98)00064-4 |
long_lat |
ENVELOPE(-67.121,-67.121,-68.580,-68.580) |
geographic |
Morena |
geographic_facet |
Morena |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_relation |
0304-4203 http://hdl.handle.net/10773/5498 doi:10.1016/S0304-4203(98)00064-4 |
op_rights |
restrictedAccess |
op_doi |
https://doi.org/10.1016/S0304-4203(98)00064-4 |
container_title |
Marine Chemistry |
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63 |
container_issue |
3-4 |
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225 |
op_container_end_page |
233 |
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1766132097643184128 |