Chemical characterization of humic substances occurring in the peats of Sarawak, Malaysia
The chemical characteristics of humic substances (HS) extracted from several samples of peat soils of Sarawak, Malaysia, were determined by size exclusion chromatography, FTIR, UV–Vis, acid–base titration, and elemental and total hydrolysable carbohydrate analyses. The results showed that the total...
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| Format: | Article |
| Language: | English |
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Elsevier Ltd.
2007
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| Online Access: | http://ir.unimas.my/id/eprint/8440/ http://ir.unimas.my/id/eprint/8440/1/Chemical%20characterization%20of%20humic%20substances%20occurring%20%28abstract%29.pdf |
| _version_ | 1848836378218987520 |
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| author | Sim, Siong Fong Murtedza, Mohamed |
| author_facet | Sim, Siong Fong Murtedza, Mohamed |
| author_sort | Sim, Siong Fong |
| building | UNIMAS Institutional Repository |
| collection | Online Access |
| description | The chemical characteristics of humic substances (HS) extracted from several samples of peat soils of Sarawak, Malaysia,
were determined by size exclusion chromatography, FTIR, UV–Vis, acid–base titration, and elemental and total hydrolysable carbohydrate analyses. The results showed that the total acidity of these HS ranged between 5.8 and 8.3 meq/g, with a clear indication that the fulvic acid component contained more carboxylic groups compared to humic acids. A comparison with the literature data for HS occurring elsewhere showed that the tropical peat of Sarawak has higher carboxylic and phenolic contents, is richer in carbohydrate moiety and also is more oxygenated. The UV–Vis analyses gave a relatively high E4/E6 ratio, implying the prominence of aliphatic components. The relatively lower range of Mw further suggested the dominance of smaller-sized humic molecules. These structural attributes suggest that the local HS may exhibit a strong complexing capability and greater susceptibility to electrophilic cleavage by trihalomethane-forming agents. |
| first_indexed | 2025-11-15T06:22:49Z |
| format | Article |
| id | unimas-8440 |
| institution | Universiti Malaysia Sarawak |
| institution_category | Local University |
| language | English |
| last_indexed | 2025-11-15T06:22:49Z |
| publishDate | 2007 |
| publisher | Elsevier Ltd. |
| recordtype | eprints |
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| spelling | unimas-84402015-07-31T02:33:18Z http://ir.unimas.my/id/eprint/8440/ Chemical characterization of humic substances occurring in the peats of Sarawak, Malaysia Sim, Siong Fong Murtedza, Mohamed GE Environmental Sciences The chemical characteristics of humic substances (HS) extracted from several samples of peat soils of Sarawak, Malaysia, were determined by size exclusion chromatography, FTIR, UV–Vis, acid–base titration, and elemental and total hydrolysable carbohydrate analyses. The results showed that the total acidity of these HS ranged between 5.8 and 8.3 meq/g, with a clear indication that the fulvic acid component contained more carboxylic groups compared to humic acids. A comparison with the literature data for HS occurring elsewhere showed that the tropical peat of Sarawak has higher carboxylic and phenolic contents, is richer in carbohydrate moiety and also is more oxygenated. The UV–Vis analyses gave a relatively high E4/E6 ratio, implying the prominence of aliphatic components. The relatively lower range of Mw further suggested the dominance of smaller-sized humic molecules. These structural attributes suggest that the local HS may exhibit a strong complexing capability and greater susceptibility to electrophilic cleavage by trihalomethane-forming agents. Elsevier Ltd. 2007 Article NonPeerReviewed text en http://ir.unimas.my/id/eprint/8440/1/Chemical%20characterization%20of%20humic%20substances%20occurring%20%28abstract%29.pdf Sim, Siong Fong and Murtedza, Mohamed (2007) Chemical characterization of humic substances occurring in the peats of Sarawak, Malaysia. Organic Geochemistry, 38 (6). pp. 967-976. ISSN 0146-6380 http://www.sciencedirect.com/science/article/pii/S0146638007000034# doi:10.1016/j.orggeochem.2006.12.010 |
| spellingShingle | GE Environmental Sciences Sim, Siong Fong Murtedza, Mohamed Chemical characterization of humic substances occurring in the peats of Sarawak, Malaysia |
| title | Chemical characterization of humic substances occurring
in the peats of Sarawak, Malaysia |
| title_full | Chemical characterization of humic substances occurring
in the peats of Sarawak, Malaysia |
| title_fullStr | Chemical characterization of humic substances occurring
in the peats of Sarawak, Malaysia |
| title_full_unstemmed | Chemical characterization of humic substances occurring
in the peats of Sarawak, Malaysia |
| title_short | Chemical characterization of humic substances occurring
in the peats of Sarawak, Malaysia |
| title_sort | chemical characterization of humic substances occurring
in the peats of sarawak, malaysia |
| topic | GE Environmental Sciences |
| url | http://ir.unimas.my/id/eprint/8440/ http://ir.unimas.my/id/eprint/8440/ http://ir.unimas.my/id/eprint/8440/ http://ir.unimas.my/id/eprint/8440/1/Chemical%20characterization%20of%20humic%20substances%20occurring%20%28abstract%29.pdf |