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C. K. Yap
Department of Biology, Faculty of Science, Universiti Putra Malaysia
Earth & Planetary Sciences Environmental Science Materials Science & Nanotechnology Mathematics Physics

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Elemental Concentrations in the Surface Sediments Collected from the Straits of Malacca: 2004 Sampling Cruise C. K. Yap
International Journal of Advances in Applied Sciences Vol 3, No 2: June 2014
Publisher : Institute of Advanced Engineering and Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (306.163 KB) | DOI: 10.11591/ijaas.v3.i2.pp70-74

Abstract

In this study, surface sediments from four geographical sampling sites in the Straits of Malacca (three near the northern part and one near the central part) were collected between February and March 2004 and they were analyzed for 35 elements by using an Inductively Coupled Plasma Mass Spectrometry (7 elements) and an Instrumental Neutron Activation Analysis (28 elements). It was found that one site at the northern part had highest levels of 23 elements out of 35. This indicated that the sampling site located at the northern part had received anthropogenic inputs due to shipping activities. However, illegal dumpings and other unidentified sources could not be rule out. In general, As, Cd, Cr, Cu, Pb and Zn have low potential to cause adverse effects on biota except for Ni that a biological effect could affect some benthic species occasionally, as compared to the Interim Sediment Quality Values. Therefore, this study provided an evidence that high elemental concentrations is plausibly due to shipping activities since the Straits of Malacca is the busiest shipping lane in this region.
Byssus as a Means of Metal Excretion Route and High Metal Levels in Fecal Materials as Metal Retention: An Experimental Laboratory Study Using Perna viridis C. K. Yap
International Journal of Advances in Applied Sciences Vol 1, No 4: December 2012
Publisher : Institute of Advanced Engineering and Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (98.679 KB) | DOI: 10.11591/ijaas.v1.i4.pp191-196

Abstract

The present study aimed at determining the concentrations of Cd, Pb and Zn in fecal materials, byssus and different soft tissues of Perna viridis under controlled laboratory conditions during accumulation and depuration tests and to discuss the roles played by byssus and fecal materials in the coastal waters. The present findings indicated that the byssus of P. viridis acted as an excretion routes for Cd, Pb and Zn while mussels have a retention mechanism of metals as evidenced in the high metal levels found in the fecal materials during the experimental study. This implied that mussel population played an important role in expediting the metal cycling as well as supposedly nutrient cycling in the coastal ecosystem by rapidly recycling back to the coastal environment in the underlying sediments.
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