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Articles by N. A. M. Shazili
Total Records ( 2 ) for N. A. M. Shazili
  M. M. Fuad , N. A. M. Shazili and M. Faridah
  Trace metals and rare earth elements (REEs) in the soft tissue of rocky shore Rock Oyster, Saccostrea cucullata, along the east coast of Peninsular Malaysia were determined. Significant inter-spatial variations ( p < 0.05) in trace metals and REEs were recorded. Significant positive correlations ( p < 0.01) were found among REEs concentrations. A few significant correlations were found for trace metals and REEs. Average distribution of metals indicated that Johor State had the highest concentrations compared with Pahang and Terengganu for all metals, except for Pb and Cu. This could most likely be attributed to the highly urbanized and industrialized activities such as sewage discharge.

The metal accumulation patterns in the oyster indicated enrichment of essential metals. Sites with relatively high concentrations of the contaminant metals Hg, Cu, Pb and Zn were related to their close proximity to industrial and urban sites or to boating and aquaculture activities. Relative enrichment of Cu, Pb and Zn in oysters in the whole study even from relatively pristine areas is thought to be derived from natural sources as these metals are significantly correlated to REEs distribution. The distribution of REEs show close similarity between all sampling sites, suggesting that they are of similar origins. In all sites, typical saw-tooth chondrite-normalized patterns were observed, which strongly suggested the REEs bioaccumulated in oyster tissues is derived from geogenic sources. Typical deviations from this pattern were found for Ce and Eu and could be explained by their redox chemistry. Results of light to heavy REEs (LREE/HREE) ratios suggested REEs fractionation in coastline marine environment produced more light REEs and less heavy REEs absorbed in the soft tissue of S. cucullata. The ratio of La/Yb in the oyster of 27.3 was remarkably similar to Terengganu River basin soil of 33.0 and to Terengganu River sediment of 27.6. Comparison of metal concentration with maximum permissible limits of toxic metals in food established in different countries, as well as Malaysian Food Act 1983 and Food Regulations 1985 Fourteen Schedule, indicated values were well within safety levels, except for Cu and Zn. Along with its wide distribution on rocky shore areas along the east coast, the present results of trace metals and REEs recorded in soft tissue of S. cucullata collected from 14 sites along the east coast of Peninsular Malaysia served as baseline data for future reference.

  S. M. Mashitah , N. A. M. Shazili and M. K. A. Rashid
  A study to illustrate the distribution of trace metals and rare earth elements (REEs) in Padina sp. as a bioindicator was done at 11 stations along the east coast of Peninsular Malaysia facing the South China Sea. The objectives of the study were to obtain baseline data for elemental concentrations (11 trace metals and 14 REEs), to evaluate the spatial variation and inter-elemental relationships, and to define the REEs pattern in seaweed. REEs were measured, as their known close relationship to the heavy metals may assist in the interpretation of metal sources and in determining whether or not there exists anthropogenic accumulation of the metals. Samples were ground to a fine powder, homogenised and quantified by inductively coupled plasma mass spectrometry (ICP-MS). Hg was detected by MA-2 Mercury Analyzer. Metals concentration showed significant variations in their distribution (p < 0.05) and most elements were in their same range of concentrations with the exception of Hg, Cd, Pb and Zn. The presented rank with high concentration of essential elements for metabolism, the partial exclusion of non-essential elements, and the enrichment of LREE over HREE is comparable to other literature. Mean level for metals and REEs were in low concentrations when compared to the literature. With regard to food safety, the concentrations of Hg, Cd, Pb and Zn on a wet weight basis were well within permissible limits set by the Malaysian Food Act. Chondrite and NASC-normalized REEs patterns of each station were generally similar to one another which suggested that they were of similar origin. The REE patterns in Padina sp. were indicative of their provenance from granite rocks, which is dominant in the Malay Peninsula, and volcanic rocks to a lesser extent. This study demonstrated that because of the close relationship of Fe and the contaminant metal Pb with the REEs, the relatively high concentrations of these metals point to their source being the granitic rocks.
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