Browsing by Author "MASNI MOHD ALI"

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    DISTRIBUTION OF POLYCYCLIC AROMATIC HYDROCARBONS IN SURFACE SEDIMENTS OF THE STRAITS OF MALACCA
    (The International Seminar on the Straits of Malacca and the South China Sea, 2016) EZZATI SULHI ABDUL RAZAK; MD FIROZ KHAN; MASNI MOHD ALI
    The individual compounds and sources of polycyclic aromatic hydrocarbon (PAHs) were studied in the surface sediments at 29 sampling sites in the Straits of Malacca along the areas of Umbai, Bandar Melaka, Tanjung Keling, and Sungai Udang during South West Monsoon on 8th July 2013. A total of 16 PAHs were determined and quantifed by gas chromatography coupled with mass spectrometry (GC-MS). The total PAH concentrations in the surface sediments detected from this study ranged from 8.07 ng/g to 390.03 ng/g with the average of 133.5 ng/g. All sampling stations were dominated by the range of low molecular weight PAHs (3-ring), 44% and 28% from high molecular weight PAHs (4 -ring). The sources of PAHs were analyzed by employing diagnostic ratios (DR) of specifc PAH compounds. The ratios in this study showed mixture of petrogenic and pyrogenic PAHs sources with a dominance of pyrogenic sources.
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    STEROL AS AN ANTHROPOGENIC MARKER IN SURFACE SEDIMENTS OF KAPAS ISLAND, TERENGGANU
    (The International Seminar on the Straits of Malacca and the South China Sea 2016, 2016) NURUL FATHIHAH MT NANYAN; SITI NUR HIDAYAH ISMAIL; MOHAMAD IZNUL MUA’AZIN MOHAMAD ZABIDI; MASNI MOHD ALI
    Kapas Island is a little tropical island in the South China Sea which is well known as one of the main tourist attractions located in Terengganu, Malaysia. This study describes sterol distribution using sewage sterol data collected from surface sediments to indicate the presence of anthropogenic effects on the coastal environment of Kapas Island. Samples from a total of 15 sampling stations were collected, extracted and analysed using Gas Chromatography-Mass Spectrometry (GC-MS). Terrestrial and sewage inputs of 7 sterol compounds were identifid to evaluate the impact of human disturbance in the marine sediment. The results indicate that the concentrations of sterol compounds ranged from 6.19 µg/g (dry weight) to 9.88 µg/g (dry weight) in the surface sediments. Faecal sterol content was used as a tool to identify sources of organic material by using the ratio between faecal sterols and terrestrial input caused by anthropogenic effects as a means to evaluate pollution levels and marine ecosystem stability. The results of the analyses indicated low concentrations and ratios of sewage sterols. Most sediment in the study area contains low levels of sewage contamination, which is probably due to the sand that characterizes the sediment. Sandy sediments are less likely to retain organic material, thus resulting in low concentrations of sterol compounds in the sediments. Nevertheless, the presence of sterol compounds is an indication of the human imprint/presence at Kapas Island.