Characterization and acid–base properties of fulvic and humic acids isolated from two horizons of an ombrotrophic peat bog
Peat humic and fulvic acids were isolated from a surface horizon (0–60 cm) and deeper horizon (>60 cm) of an ombrotrophic peat bog located in Galicia (NW Spain) and which constitutes a record of paleoenvironmental contamination. The humic and fulvic acids were characterized and compared using che...
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| Veröffentlicht in: | Geoderma 2005-06, Vol.126 (3), p.367-374 |
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| creator | Gondar, D. Lopez, R. Fiol, S. Antelo, J.M. Arce, F. |
| description | Peat humic and fulvic acids were isolated from a surface horizon (0–60 cm) and deeper horizon (>60 cm) of an ombrotrophic peat bog located in Galicia (NW Spain) and which constitutes a record of paleoenvironmental contamination. The humic and fulvic acids were characterized and compared using chemical methods and spectroscopic techniques, including ultraviolet visible (UV-vis), Fourier transform infrared (FTIR) and
13C nuclear magnetic resonance (
13C NMR). Comparison of the
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4/
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6 ratios showed that in the deeper horizon the peat humic substances have a greater degree of aromatic condensation than in the surface horizon. The alkyl C content of the humic substances remained practically unchanged, whereas the O–alkyl–C content of humic acids decreased with depth. No variation with depth in the ionization constants of the carboxylic groups or of the phenolic groups was observed. The values of the ratios of the carboxylic/phenolic contents were similar to those reported in the available literature, with a higher content of acid groups in the humic substances isolated from the lower horizon mainly attributable to the carboxylic groups. |
| doi_str_mv | 10.1016/j.geoderma.2004.10.006 |
| format | Article |
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13C nuclear magnetic resonance (
13C NMR). Comparison of the
E
4/
E
6 ratios showed that in the deeper horizon the peat humic substances have a greater degree of aromatic condensation than in the surface horizon. The alkyl C content of the humic substances remained practically unchanged, whereas the O–alkyl–C content of humic acids decreased with depth. No variation with depth in the ionization constants of the carboxylic groups or of the phenolic groups was observed. The values of the ratios of the carboxylic/phenolic contents were similar to those reported in the available literature, with a higher content of acid groups in the humic substances isolated from the lower horizon mainly attributable to the carboxylic groups.</description><identifier>ISSN: 0016-7061</identifier><identifier>EISSN: 1872-6259</identifier><identifier>DOI: 10.1016/j.geoderma.2004.10.006</identifier><identifier>CODEN: GEDMAB</identifier><language>eng</language><publisher>Amsterdam: Elsevier B.V</publisher><subject>Acid properties ; Agronomy. Soil science and plant productions ; Biological and medical sciences ; Earth sciences ; Earth, ocean, space ; Elemental and functional composition ; Exact sciences and technology ; FTIR spectroscopy ; Fundamental and applied biological sciences. Psychology ; NMR spectroscopy ; Peat fulvic acid ; Peat humic acid ; Soil depth effect ; Soils ; Surficial geology</subject><ispartof>Geoderma, 2005-06, Vol.126 (3), p.367-374</ispartof><rights>2004 Elsevier B.V.</rights><rights>2005 INIST-CNRS</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-a462t-ae2fe1e5d9f52183d7dbbcc4dccf3bf168455e880332490e2cc3ec2097b5710f3</citedby><cites>FETCH-LOGICAL-a462t-ae2fe1e5d9f52183d7dbbcc4dccf3bf168455e880332490e2cc3ec2097b5710f3</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktohtml>$$Uhttps://dx.doi.org/10.1016/j.geoderma.2004.10.006$$EHTML$$P50$$Gelsevier$$H</linktohtml><link.rule.ids>314,780,784,3550,27924,27925,45995</link.rule.ids><backlink>$$Uhttp://pascal-francis.inist.fr/vibad/index.php?action=getRecordDetail&idt=16750281$$DView record in Pascal Francis$$Hfree_for_read</backlink></links><search><creatorcontrib>Gondar, D.</creatorcontrib><creatorcontrib>Lopez, R.</creatorcontrib><creatorcontrib>Fiol, S.</creatorcontrib><creatorcontrib>Antelo, J.M.</creatorcontrib><creatorcontrib>Arce, F.</creatorcontrib><title>Characterization and acid–base properties of fulvic and humic acids isolated from two horizons of an ombrotrophic peat bog</title><title>Geoderma</title><description>Peat humic and fulvic acids were isolated from a surface horizon (0–60 cm) and deeper horizon (>60 cm) of an ombrotrophic peat bog located in Galicia (NW Spain) and which constitutes a record of paleoenvironmental contamination. The humic and fulvic acids were characterized and compared using chemical methods and spectroscopic techniques, including ultraviolet visible (UV-vis), Fourier transform infrared (FTIR) and
13C nuclear magnetic resonance (
13C NMR). Comparison of the
E
4/
E
6 ratios showed that in the deeper horizon the peat humic substances have a greater degree of aromatic condensation than in the surface horizon. The alkyl C content of the humic substances remained practically unchanged, whereas the O–alkyl–C content of humic acids decreased with depth. No variation with depth in the ionization constants of the carboxylic groups or of the phenolic groups was observed. The values of the ratios of the carboxylic/phenolic contents were similar to those reported in the available literature, with a higher content of acid groups in the humic substances isolated from the lower horizon mainly attributable to the carboxylic groups.</description><subject>Acid properties</subject><subject>Agronomy. Soil science and plant productions</subject><subject>Biological and medical sciences</subject><subject>Earth sciences</subject><subject>Earth, ocean, space</subject><subject>Elemental and functional composition</subject><subject>Exact sciences and technology</subject><subject>FTIR spectroscopy</subject><subject>Fundamental and applied biological sciences. Psychology</subject><subject>NMR spectroscopy</subject><subject>Peat fulvic acid</subject><subject>Peat humic acid</subject><subject>Soil depth effect</subject><subject>Soils</subject><subject>Surficial geology</subject><issn>0016-7061</issn><issn>1872-6259</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2005</creationdate><recordtype>article</recordtype><recordid>eNqFkE2OEzEQhS0EEmHgCsgb2HXGdnfbnR0oYgBpJDawtqrL5Ymj7nawnUGMWHAHbshJcCaDWLKqH33vleox9lKKtRRSX-7XNxQdpRnWSoiuLtdC6EdsJQejGq36zWO2EpVsjNDyKXuW876ORiixYj-2O0iAhVK4gxLiwmFxHDC43z9_jZCJH1I8UCqBMo-e--N0G_Ae2h3nU1fRzEOOExRy3Kc48_It8l2sjnG5F8HC4zymWKrVrmoOBIWP8eY5e-JhyvTioV6wL1fvPm8_NNef3n_cvr1uoNOqNEDKk6TebXyv5NA648YRsXOIvh291EPX9zQMom1VtxGkEFtCJTZm7I0Uvr1gr8--9ZevR8rFziEjTRMsFI_ZStPqXnamgvoMYoo5J_L2kMIM6buVwp7Ctnv7N2x7Cvu0r2FX4auHC5ARJp9gwZD_qbXphRpk5d6cOarv3gZKNmOgBcmFRFisi-F_p_4ADh2cXw</recordid><startdate>20050601</startdate><enddate>20050601</enddate><creator>Gondar, D.</creator><creator>Lopez, R.</creator><creator>Fiol, S.</creator><creator>Antelo, J.M.</creator><creator>Arce, F.</creator><general>Elsevier B.V</general><general>Elsevier</general><scope>IQODW</scope><scope>AAYXX</scope><scope>CITATION</scope><scope>F1W</scope><scope>H96</scope><scope>L.G</scope></search><sort><creationdate>20050601</creationdate><title>Characterization and acid–base properties of fulvic and humic acids isolated from two horizons of an ombrotrophic peat bog</title><author>Gondar, D. ; Lopez, R. ; Fiol, S. ; Antelo, J.M. ; Arce, F.</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-a462t-ae2fe1e5d9f52183d7dbbcc4dccf3bf168455e880332490e2cc3ec2097b5710f3</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2005</creationdate><topic>Acid properties</topic><topic>Agronomy. Soil science and plant productions</topic><topic>Biological and medical sciences</topic><topic>Earth sciences</topic><topic>Earth, ocean, space</topic><topic>Elemental and functional composition</topic><topic>Exact sciences and technology</topic><topic>FTIR spectroscopy</topic><topic>Fundamental and applied biological sciences. Psychology</topic><topic>NMR spectroscopy</topic><topic>Peat fulvic acid</topic><topic>Peat humic acid</topic><topic>Soil depth effect</topic><topic>Soils</topic><topic>Surficial geology</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Gondar, D.</creatorcontrib><creatorcontrib>Lopez, R.</creatorcontrib><creatorcontrib>Fiol, S.</creatorcontrib><creatorcontrib>Antelo, J.M.</creatorcontrib><creatorcontrib>Arce, F.</creatorcontrib><collection>Pascal-Francis</collection><collection>CrossRef</collection><collection>ASFA: Aquatic Sciences and Fisheries Abstracts</collection><collection>Aquatic Science & Fisheries Abstracts (ASFA) 2: Ocean Technology, Policy & Non-Living Resources</collection><collection>Aquatic Science & Fisheries Abstracts (ASFA) Professional</collection><jtitle>Geoderma</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Gondar, D.</au><au>Lopez, R.</au><au>Fiol, S.</au><au>Antelo, J.M.</au><au>Arce, F.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Characterization and acid–base properties of fulvic and humic acids isolated from two horizons of an ombrotrophic peat bog</atitle><jtitle>Geoderma</jtitle><date>2005-06-01</date><risdate>2005</risdate><volume>126</volume><issue>3</issue><spage>367</spage><epage>374</epage><pages>367-374</pages><issn>0016-7061</issn><eissn>1872-6259</eissn><coden>GEDMAB</coden><abstract>Peat humic and fulvic acids were isolated from a surface horizon (0–60 cm) and deeper horizon (>60 cm) of an ombrotrophic peat bog located in Galicia (NW Spain) and which constitutes a record of paleoenvironmental contamination. The humic and fulvic acids were characterized and compared using chemical methods and spectroscopic techniques, including ultraviolet visible (UV-vis), Fourier transform infrared (FTIR) and
13C nuclear magnetic resonance (
13C NMR). Comparison of the
E
4/
E
6 ratios showed that in the deeper horizon the peat humic substances have a greater degree of aromatic condensation than in the surface horizon. The alkyl C content of the humic substances remained practically unchanged, whereas the O–alkyl–C content of humic acids decreased with depth. No variation with depth in the ionization constants of the carboxylic groups or of the phenolic groups was observed. The values of the ratios of the carboxylic/phenolic contents were similar to those reported in the available literature, with a higher content of acid groups in the humic substances isolated from the lower horizon mainly attributable to the carboxylic groups.</abstract><cop>Amsterdam</cop><pub>Elsevier B.V</pub><doi>10.1016/j.geoderma.2004.10.006</doi><tpages>8</tpages></addata></record> |
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| ispartof | Geoderma, 2005-06, Vol.126 (3), p.367-374 |
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| source | Access via ScienceDirect (Elsevier) |
| subjects | Acid properties Agronomy. Soil science and plant productions Biological and medical sciences Earth sciences Earth, ocean, space Elemental and functional composition Exact sciences and technology FTIR spectroscopy Fundamental and applied biological sciences. Psychology NMR spectroscopy Peat fulvic acid Peat humic acid Soil depth effect Soils Surficial geology |
| title | Characterization and acid–base properties of fulvic and humic acids isolated from two horizons of an ombrotrophic peat bog |
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