Investigation of aliphatic hydrocarbons in core sediments of Brunei Bay, East Malaysia

Pang, Swee Yun; Suratman, Suhaimi; Tay, Joo Hui; Mohd Tahir, Norhayati

Investigation of aliphatic hydrocarbons in core sediments of Brunei Bay, East Malaysia

2021

Pang, Swee Yun | Suratman, Suhaimi | Tay, Joo Hui | Mohd Tahir, Norhayati

The distribution of aliphatic hydrocarbons in three sediment cores from Brunei Bay was investigated in order to understand their sources and the biogeochemical processes of these hydrocarbons. The total concentrations of C₁₅ to C₃₇n-alkanes ranged from 0.70 to 16.5 μg g⁻¹. Traces of hopanes with C₂₉–C₃₁ carbon homologs were detected in the study area. The carbon preference index (CPI₁₅–₃₇) ranged from 1.23 to 3.42 coupled with the natural n-alkane ratio (NAR₁₉–₃₂) ratios (1.52 to 5.34), and the presence of unresolved complex mixtures and hopanes, suggested slight contamination by anthropogenic hydrocarbons, presumably derived from activities along the coasts. The presence of C₂₇ trisnorhopene and diploptene, as well as their association with long-chain and short-chain n-alkanes, revealed a depositional environment of organic matter in the sediment cores.

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