Chemical characterization of humic substances occurring in the peats of Sarawak, Malaysia

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

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Abstract

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.

Item Type: Article
Uncontrolled Keywords: humic substances, chemical characteristics, research, Universiti Malaysia Sarawak, unimas, university, universiti, Borneo, Malaysia, Sarawak, Kuching, Samarahan, ipta, education
Subjects: G Geography. Anthropology. Recreation > GE Environmental Sciences
Divisions: Academic Faculties, Institutes and Centres > Faculty of Resource Science and Technology
Depositing User: Karen Kornalius
Date Deposited: 31 Jul 2015 02:33
Last Modified: 31 Jul 2015 02:33
URI: http://ir.unimas.my/id/eprint/8440

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