Aliphatic and polycyclic aromatic hydrocarbons in sediment from Brunei Bay
Sixteen core sediment samples, collected from Brunei Bay were analyzed for aliphatic and polycyclic aromatic hydrocarbons (pAHs). These hydrocarbons were recovered from core sediment by Soxhlet extraction and then analyzed using gas chromatography equipped with flame ionization detector (GCIFID). C...
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| Main Author: | |
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| Format: | Thesis |
| Language: | English |
| Published: |
2005
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| Subjects: | |
| Online Access: | http://ir.unimas.my/id/eprint/28769/2/Mohd%20Khairil.pdf |
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| Summary: | Sixteen core sediment samples, collected from Brunei Bay were analyzed for aliphatic and polycyclic aromatic hydrocarbons (pAHs). These hydrocarbons were
recovered from core sediment by Soxhlet extraction and then analyzed using gas chromatography equipped with flame ionization detector (GCIFID). Concentrations
of heavy metals were measured using atomic adsorption spectrophotometer (AAS) and used as supplementary data. Total concentrations of aliphatic hydrocarbons
and PAHs in core sediment of Brunei Bay ranged from 14.5 - 225.2 ~/g dry weight and 0.11 . 4.75J.l gig dry weight, respectively. Generally, hydrocarbon concentrations
were found to be relatively high at the first two layer compared to the concentrations in the deeper layer of sediment, suggesting increasing hydrocarbons
input in more recent times. Several molecular indices and distribution patterns were used to predict the predominant sources of hydrocarbons. Petrogenic
hydrocarbons were abundant in Labuan Island sediments, where intense petrochemical, harbor shipping and fisheries activities occurred. Petrogenic and
pyrolytic hydrocarbons were dominant at the Open Sea and Lawas core sediment. Pyrolytic and biogenic hydrocarbons were more abundant in sediment from Padas estuary. Chemometric approaches (e.q. simple correlation analysis, principal component analysis (peA) and cluster analysis) were applied to investigate the fate and dispersal pathway of the pollutant in the sediment from Brunei Bay. Result clearly showed that the hydrocarbon often originated from land-based input, particularly from the Labuan Island, Lawas and Padas Rivers, while atmospheric
input is the dominant pathway at the Open Sea sediment. |
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