The rapid urbanization processes in island coastal areas has led to serious pollution in the marine environment. Less is known about the trace metal speciation and ecological risk (ER) in the coastal sediments of island areas under various human activities pressures, which is essential to address the connection between metal pollution and anthropogenic impacts. We report here the trace metals concentration and its ecological risk on the coast of South Andaman Island (SAI). A total of 23 study locations were selected (March 2013) and the surface sediments were studied for trace metal concentrations such as Iron (Fe), Manganese (Mn), Chromium (Cr), Cobalt (Co), Copper (Cu), Nickel (Ni), Arsenic (As), Zinc (Zn), and Lead (Pb). Moreover, the marine pollution indices such as Enrichment Factors (EFs), Geo-accumulation Index (${\mathit{I}}_{\mathrm{geo}}$), Contamination Factor (CF), Pollution Load Index (PLI), and Sediment Pollution Index (SPI) were also studied to consider the spatial distribution of trace metals. The concentration values of trace elements are found in the order of Fe > Mn > Cr > Ni > Zn > Cu > Co > Pb > As. The CF analysis suggested that the South Andaman coastal sediments are a relatively significant level of elements contamination. Besides the EF and ${\mathit{I}}_{\mathrm{geo}}$ values also showed significant enrichment in the nearby settlement area and indicated that the study locations are coming under unpolluted and moderately polluted categories. The PLI and SPI analyses showed that the inner Bay region (stations 1, 2, 3, and 20) of Port Blair Bay is a highly polluted area and its ER values suggest that the sediments fall under the moderate risk (69.56%) and considerable risk (30.43%) categories. The statistical analysis clearly indicated that the accumulations of trace elements in the study locations are due to anthropogenic inputs from the adjacent land-based sources. Spatial data on the heavy metal concentration of the studied site would help the policymaker/environmental managers to identify the vulnerability site and take appropriate remedial effort to protect the pristine island coastal ecosystem.

岛屿沿海地区的快速城市化进程导致海洋环境受到严重污染。在各种人类活动压力下，岛屿地区沿海沉积物中的痕量金属形态和生态风险（ER）鲜为人知，这对于解决金属污染与人为影响之间的联系至关重要。我们在这里报告南安达曼岛（SAI）海岸上的痕量金属浓度及其生态风险。总共选择了23个研究地点（2013年3月），并对表面沉积物的痕量金属浓度进行了研究，例如铁（Fe），锰（Mn），铬（Cr），钴（Co），铜（Cu），镍（Ni），砷（As），锌（Zn）和铅（Pb）。此外，海洋污染指数，例如富集因子（EFs），地质累积指数（${\mathit{一世}}_{\mathrm{地缘}}$），还研究了污染因子（CF），污染负荷指数（PLI）和沉积物污染指数（SPI）以考虑痕量金属的空间分布。以Fe> Mn> Cr> Ni> Zn> Cu> Co> Pb> As的顺序找到痕量元素的浓度值。CF分析表明，安达曼南部沿海沉积物是元素污染的相对较高水平。除了EF和${\mathit{一世}}_{\mathrm{地缘}}$值还显示附近聚居区显着富集，表明研究地点属于未污染和中度污染类别。PLI和SPI分析表明，布莱尔港湾的内湾区（1、2、3和20号站）是一个高度污染的地区，其ER值表明沉积物处于中等风险（69.56％）且相当可观。风险（30.43％）类别。统计分析清楚地表明，研究地点中痕量元素的积累归因于来自相邻陆地来源的人为投入。有关所研究地点的重金属浓度的空间数据将有助于政策制定者/环境经理识别脆弱性地点并采取适当的补救措施来保护原始岛屿沿海生态系统。