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Articles by N.A.M. Shazili
Total Records ( 3 ) for N.A.M. Shazili
  M.C. Ong , D. Menier , N.A.M. Shazili and V. Dupont
  Concentration of selected Metallic Trace Elements (MTEs), chromium, manganese, iron, cobalt, copper, zinc, lead and cadmium in surficial sediments from gulf of Morbihan were studied in order to understand the current MTEs contamination due to urbanization and mariculture economic development surrounding the gulf region. Therefore, the distribution, enrichment and accumulation of MTEs in 101 surficial sediments collected by Orange Peel grab were characterized for MTEs content using ICP-MS after mixed acid digestion. The average concentrations of selected MTEs were 36.2±23.9 μg g-1 dry weight (Cr), 278±140 μg g-1 dry weight (Mn), 2.40±1.29% (Fe), 14.4±5.31 μg g-1 dry weight (Co), 16.4±10.3 μg g-1 dry weight (Cu), 38.1±19.1 μg g-1 dry weight (Zn), 34.6±13.9 μg g-1 dry weight (Pb) and 0.11±0.06 μg g-1 dry weight (Cd), respectively. Results from the analysis showed that MTEs studied have relatively low index of geo-accumulation and enrichment factors values and were in value to conclude practically uncontaminated within the gulf. Overall, the geochemistry of the sediment of gulf of Morbihan was influenced by both natural and anthropogenic inputs to the catchment. However, direct comparison with upper continental crust indicated that natural processes were more dominant than anthropogenic input in concentrating metals.
  G. Adiana , B. Joseph , N.A.M. Shazili , M. Mohamad and H. Juahir
  A research expedition was carried out off the Borneo Island coastal in order to define the current level and behavior of metals in the water column of Sulu and Celebes Seas. Water samples were collected at 37 stations off Sabah and Sarawak coasts. Samples were then pre-concentrated using Chelex-100 resin, preserved on-board ship prior transportation to the laboratory and finally, analyzed using Inductively Coupled Plasma Mass Spectrometry (ICP-MS). Overall, the vertical profiling of metals showed no distinctive patterns. In the meantime, the Principal Component Analysis (PCA) showed a group of bioactive metals and abundance metals in the upper continental crust. Additionally, PCA showed the decrease in of temperature and salinity led to increase of Dissolved Oxygen (DO) in depth. Besides that, the elements partitioning exhibits that Chromium (Cr), Nickel (Ni), iron (Fe) and lead (Pb) has the strongest adsorption onto Suspended Particulate Matter (SPM) whereas Cadmium (Cd), Zinc (Zn) and Aluminium (Al) showed the weakest bond with SPM. In brief, data collected throughout the present research has evidence the influenced of land-based contaminants into the water column as well as the physico-chemical characteristics of Sulu and Celebes Seas off Malaysian waters.
  M.C. Ong , N.A.M. Shazili , D. Menier and A.W.M. Effendy
  The concentration of trace elements, copper, zinc, cadmium and lead in the two oyster species (Ostrea edulis) and (Crassostrea gigas) collected from mariculture sites in the Quiberon bay were studied to investigate metal contamination in the surrounding area and its significant risk assessment to human who consumed the both species. Cu, Zn, Cd and Pb were analyzed by using inductively coupled plasma-mass spectrometry after acid digestion process. Certified reference materials, Oyster tissue, SRM1556a was used to validate the methods and the results shown a good agreement with the certified values. The levels of Cu, Zn, Cd and Pb in oyster flesh were 0.26-14.5, 4.61-83.9, 0.01-0.11 and 0.02-0.41 mg kg-1 wet weight. Element levels in C. gigas were generally higher than O. edulis. Element concentrations in the flesh were assessed for human consumption according to Provisional Tolerable Weekly Intake (PTWI) and Provisional Tolerable Daily Intake (PTDI). Due to their bioaccumulation capacity of trace elements, both oysters’ species had the potential of being used as biomonitors to control the aquatic contaminations by trace elements.
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