Sains Malaysiana 29: 225-232 (2000)                                                                           Sains Bumi I

Earth Science

Sedimentation Rate of Trace Elements in the Surface Sediment

of the South China Sea

Che Abd Rahim Mohamed

Department of Marine Science

Universiti Kebangsaan Malaysia

43600 UKM Bangi, Selangor D.E. Malaysia

Noor Azhar Mohamed Shzili

Department of Marine Science

Faculty of Science and Technology

Universiti Putra Malaysia, Mengabang Telipot

21030 Kuala Terengganu, Malaysia

ABSTRACT

Trace elements contents in the surface sediments (about 5 cm depth) of the South China Sea were obtained during the Ekspedisi Matahari cruises. Their concentrations are slightly different from cruise to cruise and may be related to the content of water column and input from the land through river or wind. The range of accumulation rates of the heavy metals are also wide; 3.80 ­23.7 mg.cm2/kyr,8.89 - 24.7 mg.cm2/kyr, 3.78 - 14.4 mg.cm2/kyr and 20.1 ­30 mg.cm2/kyr for Cu, Ni, Pb and Zn, respectively. The metal/Fe ratios are slightly same with the preindustrial period and probably controlled by natural inputs from water column.

ABSTRAK

Kandungan logam berat di permukaan sedimen (kedalaman sekitar 5 cm) Laut China Selatan diperolehi semasa pelayaran Ekpedisi Matahari. Kandungannya adalah berbeza daripada satu pelayaran ke satu pelayaran. 1ni berkemungkinan bergantung pada kandungannya di dalam air dan input dari daratan melalui sungai ataupun angin. Julat kadar pemendapan logam berat juga adalah Lebar iaitu 3.80 - 23.7 mg.cm2/kth, 8.89 - 24.7 mg.cm2/kth, 3.78 - 14.4 mg.cm2/kth dan 20.1 - 30 mg.cm2/kth bagi Cu, Ni, Pb dan Zn, masing-masing. Nisbah kepekatan logam Fe yang diperolehi pada masa kini adalah agak sama dengan masa praperusahaan dan berkemungkinan dipengaruhi oleh input semulajadi dari turus air.

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