Sains Malaysiana 30: 27-38 (2001)                                                                                                     Sains Bumi /

Earth Sciences


Distribution of Trace Metals in Tropical Surface Sediment

during Pre-Monsoon and Post-Monsoon



Che Abd Rahim Mohamed

Program of Marine Science

School of Environmental Science and Natural Resources

Faculty of Science and Technology

Universiti Kebangsaan Malaysia

43600 UKM Bangi, Selangor D.E., Malaysia


Noor Azhar Mohamed Shazili, Mohd Kamil Rashid,

Mohd Lokman Husin & Rosna Yaakob

Department of Marine Science

Faculty of Science and Technology

Universiti Putra Malaysia Terengganu

Mengabang Telipot, 21030 Kuala Terengganu, Malaysia





Pensampelan sedimen permukaan di Te!uk Siam dan Laut China Selatan telah dilakukan pada musim pra-monson dan pasca-monson. Sebanyak lapan puluh satu stesen dilakukan untuk penganalisaan logam berat iaitu plumbum (Pb), besi (Fe), kromium (Cr) dan mangan (Mn). Keputusan semasa pre­monson mendapati  julat kepekatan logam adalah di antara 7.02-27. 8 μgg-l, 0.71-2.82%, 20.5-122 μgg-1 dan 209-720 μgg-1 bagi Pb, Fe, Cr dan Mn, masing-masing. Tetapi semasa pelayaran post-monson, julat kepekatannya di antara 5.24-91 μgg-1, 0.70-2.38 %, 21.1-101 μgg-1 dan 117-797 μgg-1 for Pb, Fe, Cr dan Mn, masing-masing. Pada umumnya, kepekatan Fe, Cr dan Mn adalah tinggi pada musim pra-monson kecuali bagi Pb. 1ni adalah berkaitan dengan pengaruh musim monsoon ke atas sedimen.





Surface sediment samples were collected in the Gulf of Thailand and South China Sea during pre-monsoon and post-monsoon periods. Eighty-one stations were sampled for trace metal analyses i. e., lead (Pb), iron (Fe), chromium (Cr) and manganese (Mn). Results during the pre-monsoon shows that, metals concentration ranges between 7.02-27.8 μgg-l, 0.71-2.82%, 20.5-122 μgg-1 and 209-720 μgg-1 for Pb, Fe, Cr and Mn respectively. During the post-monsoon cruise, however, the metal concentration ranges between 5.24-91 μgg-l, 0.70-2.38 %, 21.1-101 μgg-1 and 117-797 μgg-1 for Pb, Fe, Cr and Mn respectively. In general, the concentrations of Fe, Cr and Mn were higher in the pre-monsoon period except for Pb. This is related to the influence of the monsoon season on sediment.  






Boucher, O. Pham', M. & Sadourny, R. 1997. General circulation model simulations of Indian summer monsoon with increasing levels of sulphate aerosols. Annales Geophysicae (accepted). At http-://

Boyle, E. A., Edmond, J. M. & Sholkovitz, E.R. 1977. The mechanism of iron removal in estuaries. Geochimica et Cosmochimica. Acta 41: 1313-1324.

Calvert, S. E. & Pederson, T. F. 1993. Geochemistry of recent oxic and anoxic marine sediments: Implications for the geological record. Marine Geology 113: 67-88.

Chester, R. 1990. Marine Geochemistry. Unwin Hyman Ltd.

Froelich, P. N., Klinkhammer, G. P., Bender, M. L., Luedtke, N. A., Heath, G. R., Cullen, D., Dauphin, P., Hammond, D., Hartman, B. & Maynard, V. 1979. Early oxidation of organic matter in pelagic sediments of the eastern equatorial Atlantic: suboxic diagenesis. Geochimica et Cosmochimica. Acta 43: 1075-1090.

Hungspreugs, M. & Yuangthong, C. 1983. A history of metal pollution in the upper Gulf of Thailand. Marine Pollution Bulletin 14(12): 465-469.

Katz, S. A. & Jenniss, S. W. 1983. Regulatory compliance monitoring by atomic spectroscopy. Lerlag Chemie International 278 pp.

Mason, B. & Moore, C. B. 1982. Principles of Geochemistry, 4th ed. New York: J. Wiley and Sons.

Schaule, B. K. & Patterson, C. C. 1981. Lead concentrations in the northeast Pacific: evidence for global anthropogenic perturbations. Earth and Planetary Science Letter 54: 97-116.

Shazili. N. A. M.,  Mohamed. C.A.R. & Yaakob, R. 1989. Heavy metals in sediments of the South China Sea. Proc. 12th Annual Seminar of the Malaysian Society of Marine Science, 99-106.

Srisuksawad, K., Porntepkasemsan, B., Nauchpramool, S., Yamkate, P., Carpenter, P., Peterson, M. L. & Hamilton, T. 1997. Radionuclide activities, geochemistry, and accumulation rates of sediments in the Gulf of Thailand. Continental Shelf Research 17: 925-965.

Trefry, J. H., elson. T. A. Trocine, R. P., Metz , S. & Vetter, T. W. 1986. Trace metal fluxes through the Mississippi river delta system. Reun. Cons. Int. Explor. Mer. 186: 277-280.

Tsunogai, S. & Kusakabe, M. 1981. Migration of Manganese in the deep sea sediment. In Fanning & K. A., Manheim, F. T. (eds.) The dynamic environment of the ocean floor. Lexington: D.C. Heath, 257-273.

Turekian, K. K. & Wedepohl, K. H. 1961. Distribution of the elements in some major units of the earth's crust. Geological Society  of America Bulletin 72: 175-192.

Windom, H. L., Silpipat, S., Chanpongsang, A., Smith, R. G. & Hungspreugs, M. 1984. Trace metal composition and accumulation rates of sediments in the upper Gulf of Thailand. Estuarine, CoastaL and Shelf Science 19: 133-142.

Windom, H. L., Smith, R. G. & Maeda, M. 1985. The geochemistry of lead in rivers. estuaries and continental shelf of the southeastern United States. Marine Chemistry 17: 43-56.

Windom, H. L., Smith, R. Jr. & Rawlinson, C. 1988. Trace metal transport in a Tropical estuary. Marine Chemistry 24: 293-305.

Wood, A. K., Ahmad, Z., Shazili,. N. A. M., Yaakob, R. & Carpenter. R. 1997. Geochemistry of sediments in Johor Strait between Malaysia and Singapore. Continental  Shelf Research 17: 1207-1228.

Yeats, P. A. & Bewer, J. M. 1976. Trace metals in the water of Saguenay Fjord.Canada Journal Earth Science 13: 1319-1327.

Zhang, J., Huang, W. W., Liu, S. M., Liu, M. G., Yu, Q. & Wang, J. H. 1992. Transport of particulate heavy metals towards the China Sea: A preliminary study and comparison. Marine Chemistry 40: 161-178.