Heavy metals distribution in the surface sediments from central west coast of Cebu, Philippines
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概要
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This study aims to quantify the level of heavy metals in the sediments from the central west coast of Cebu, Philippines where previous Cu mining activity downloaded waste through the Sapangdaku River and the tailings outfall located at Ibo town. The surface sediments collected from the study area were analyzed for grain size fraction, total organic carbon (TOC), CaCO3 and total heavy metals (Cu, Zn, Pb, Co, Ni and Fe).Our results showed that the majority of the surface sediments were dominated by coarse fraction (>80% sand, <20% silt and clay). The range of TOC content in the surface sediments was found to be 0.08-2.71%. The variability of TOC can be attributed to variable sources of organic matter along the coast, and to the silt and clay fraction in the sediments. The CaCO3 content in the surface sediments from the northernmost and southernmost parts of the study area was high (>10-60%) due to the abundance of calcite. The heavy metal content in the surface sediments from the tailings outfall in Ibo were higher compared to the other samples (Cu=>700ppm, Zn=>100ppm, Pb=>10ppm, Co=>30ppm, Ni=>20ppm and Fe=>5%). The concentration of heavy metals decreased towards the northern and southern parts of the area. The calculated Enrichment Factor (EF) showed that the heavy metals were highly enriched in the surface sediments from the tailings outfall in Ibo and near the mouth of the Sapangdaku River.The enrichment of metals in the sediments from Ibo indicates an anthropogenic impact. In contrast, enrichment of metals from the mouth of the Sapangdaku River is believed to be dominantly natural; the mixing of fresh water and seawater might have accounted for the deposition and accumulation of these metals. The correlation of silt and clay fraction and heavy metals suggest that grain size fraction and Fe scavenging play major roles in the abundance and distribution of metals in surface sediments in the study area.
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