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

ABSTRAK

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.

ABSTRACT

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.  

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