Browsing by Author "Joseph Bidai"

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    The Spatial Distribution Of Al, Fe, Cu, Cd And Pb In The Surface Sediment Of Brunei Bay, Borneo During The Southwest And Northeast Monsoons
    (Journal of Sustainability Science and Management, 2016) Adiana Ghazali; Noor Azhar Mohamed Shazili; Joseph Bidai; Hasrizal Shaari
    A geochemical assessment of Al, Fe, Cu, Cd and Pb was carried out for the surface sediment of Brunei Bay. Samples were collected during July 2013 and January 2014 representing the Southwest and Northeast Monsoon respectively. Fe, Pb, Al and Cu were high in July 2013 samples whereas Cd had a similar range of concentration during both sampling periods. Cd showed no particular spatial distribution pattern whereas Fe and Pb were highly distributed at the transect stations compared to the coastal stations due to the river flushed out. In contrast, Al and Cu were uniformly distributed between all stations. The Al, Fe and Pb in Brunei Bay sediment were dominantly bound to the mineral fraction which is also an indicator of natural sources whereas Cu was more dominant in the ion exchangeable fraction which is the most bioavailable fraction.
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    Vertical Profile of Heavy Metals Concentration in Core Sediments of Sungai Muar, Johor, Malaysia
    (Middle-East Journal of Scientific Research, 2016) Ong Meng Chuan; Wan Mohd Ikhram Wan Jamil; Joseph Bidai
    Two core sediment samples were collected along Sungai Muar, Johor. The down core variation in heavy metals concentrations (As, Cd, Cu, Pb, Zn, Hg) and sediment characteristic were determined by using Inductively Coupled Plasma-Mass Spectrometry (ICP-MS) and Particle Size Analyzer, respectively. The result shows the average concentration (ppm) of selected heavy metals in the S4 core followed the order Zn (54.05) >Pb (16.33) > Cu (9.63) >As (3.43) > Cd (0.054) > Hg (0.031). For S5 core sediment, the average concentration for Zn, Pb, Cu, As, Hg and Cd were 59.75, 23.77, 15.04, 3.57, 0.034 and 0.10, respectively. The EF result shows, all the selected heavy metals from S4 and S5 core sediment were came from natural sources (EF<2). For index of geoaccumulation (Igeo), the S4 and S5 core were unpolluted by Zn, Cu, Pb, Cd and Hg, whereas the Aswas in uncontaminated to moderately contaminated status for both core. The average of pollution load values (PLI) was concluded that S5 core was polluted by selected heavy metals, but not in S4. The result of sediment characteristics shows average of mean size value for S4 core sediment was 7.58Ø and was higher than S5 cores, 6.73Ø.