merged

Determination of Hydrocarbons in Marine Core Sediments off Tioman
Island
Nur Shahirah Binti Rozmi
Supervisor: Prof Dr. Norhayati Binti Mohd Tahir
Bachelor of Science (Analytical and Environmental Chemistry)
School of Marine and Environmental Sciences
Universiti Malaysia Terengganu
A study was carried out on selected areas off Tioman Island to determine the
distribution and possible sources of hydrocarbons in core sediments. TOC was
determine using Walkey-Black method. N-alkanes and polycyclic aromatic
hydrocarbons (PAH) were extracted using ultrasonic extraction and analyzed using
GC-MS. TOC values ranged between 0.15 - 0.99%. Distribution of n-alkanes (odd to
even; C10-C33; Cmax: C16, C21, C31) suggested input of epicuticular higher plant
waxes with Cmax predominance at C27 to C33 in the area whilst presence of shorter
to mid-range dominance C16 to C21 indicated inputs of marine biogenic sources. The
distribution of PAHs shows influences both pyrolytic and petrogenic contamination.
Perylene found in all samples indicated the presence of diagenetic PAHs. Existence of
UCM together with CPI and Pr/Phy ≤ 1 indicated the presence of petrogenic
contamination in coastal station. Atmospheric deposition is also an important source
of pyrolytic PAHs in the core sediments.
1961 | UMT UNDERGRADUATE RESEARCH DAY 2018