Assessment of Selected Trace Metals, Physicochemical Parameters and Total Organic Carbon in Seawater along Tanjung Datu and Sematan Coastal Area

Farah Akmal, Idrus and Adriana, Christopher Lee and Jannatul Aisyah, Jamalulin (2024) Assessment of Selected Trace Metals, Physicochemical Parameters and Total Organic Carbon in Seawater along Tanjung 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. 37-56. ISBN 978-967-0054-79-7

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Abstract

Tanjung Datu and Sematan coastal area are located at the west of Sarawak and has exposed to PanBorneo highway construction activities and annual haze, which can influence the concentration of trace metals, nutrients and organic carbon in the seawater. This study was specifically focused on trace metals (Al, Fe, Mn, Zn, Ni, Cu, Cr, Cd and Co), physicochemical parameters and total organic carbon (TOC) in seawater along the Tanjung Datu and Sematan coastal area. Trace metals were analysed using the Flame Atomic Absorption Spectroscopy (FAAS) and TOC analysis were using the TOC Analyser. The trends for trace metals concentration were Al (9.12 – 30.24 µM) >Fe (1.31 -8.24 µM) > Ni (0.61 – 1.17 µM) > Zn (0.57 – 0.67 µM) > Co (0.44 – 1.14 µM) > Cr (0.28 – 2.32 µM) > Mn (0.21 – 0.50 µM) > Cd (0.10 – 0.18 µM) > Cu (0.04 -1.01 µM). Physicochemical parameters values were 4.11 – 5.31 mg/L (DO), 30.49 – 31.53 °C (temperature), 0.52 - 13.0 NTU (turbidity), 7.97 – 8.89 (pH), 26.88 – 27.15 ppt (salinity), 46.7 – 47.78 mS/cm (conductivity), 27,365 – 27,628 mg/L (TDS), 0.01 – 0.05 mg/L (TSS), 0.02 – 0.28 µg/L (Chl-a), 3.07 - 3.90 mg/L (BOD5 ), 0.40 – 3.55 mg/L (phosphate), 0.01 – 0.05 mg/L (nitrate), 0.01 – 0.11 mg/L (nitrite) and 0.94 – 4.99 mg/L (ammonia). The range of TOC concentrations were 2.43 – 7.49 mg/L. The results showed that the potential sources of trace metals, nutrients (e.g. phosphate) in this area came from both atmospheric and land.

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