Assessment of Selected Heavy Metals and Total Organic Carbon in Surface Sediments along Tg. Datu and Sematan Coastal Area

Farah Akmal, Idrus and Fatin Qistina Ally, Zulkifli and Adriana, Christopher Lee (2024) Assessment of Selected Heavy Metals and Total Organic Carbon in Surface Sediments along Tg. Datu and Sematan Coastal Area. In: Tanjung Datu National Park to Samunsam. Proceeding of Aquatic Science Colloquium 2019 (AQUAColl 2019) Experience Sharing in Aquatic Science Research V . UNIMAS Publisher, Kota Samarahan, Sarawak, pp. 79-92. ISBN 978-967-0054-79-7

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Abstract

Tanjung Datu and Sematan Coastal areas were exposed to recreational activities and construction of Pan Borneo Highway, Sarawak, which may receive indirect input of heavy metals and other components into the nearby seawater. The objectives of this study were (1) to determine the concentration of selected heavy metals concentration (Al, Cd, Co, Cr, Cu, Fe, Mn, Ni and Zn) and (2) to assess the TOC in surface sediment at stations between Tg. Datu and Sematan Coastal areas. Samples were digested following the acid digestion method before analysing with the Flame Atomic Absorption Spectroscopy (FAAS, iCE 3000 Series AA) and total organic carbon analyser (TOC, Shimadzu). The results of heavy metals concentration were followed the sequences of Al (537.33 - 432.44 mg/kg) >Fe (6.81 – 110.01 mg/kg) > Cu (11.84 – 13.02 mg/kg) > Ni (5.27 – 6.50 mg/kg) > Co (3.48 – 4.35mg/kg) > Cr (0.39 – 9.18 mg/kg) > Mn (2.57 – 5.47 mg/kg) >Zn (0.38 – 3. 66 mg/kg) > Cd (0.94 – 1.09 mg/kg). For TOC, all stations were followed the sequences of Station G (1.44±0.01 %) > Station B (1.31±0.03 %) > Station C (0.51±0.02 %) > Station E (0.46±0.03 %) > Station D (0.43±0.04 %) > Station A (0.13±0.02 %). Overall, concentrations of heavy metals and TOC were considerably low. Atmospheric and land-based inputs were the main sources for heavy metals around the sampling areas.

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