Department of Chemical Oceanography, School of Marine Sciences, Cochin University of Science and Technology, Kochi 682016, India.
Department of Chemical Oceanography, School of Marine Sciences, Cochin University of Science and Technology, Kochi 682016, India.
Mar Pollut Bull. 2022 Feb;175:113163. doi: 10.1016/j.marpolbul.2021.113163. Epub 2021 Nov 24.
Distribution and ecological risk assessment of trace metals were carried out in the core sediments of a highly urbanized tropical mangrove ecosystem along the Southwest coast of India. The metal distribution pattern was as follows: Co, Cu, Ni and Pb adsorbed onto Fe oxyhydroxides and fine grained sediments; Cd and Zn preferential adsorption by organic matter and Cr scavenging by Mn oxyhydroxides. Cd, Pb and Zn were significantly enriched in upper sediments, while Cd, Ni and Zn were present in metal exchangeable fractions. Geoaccumulation index (I) suggested that the study area showed moderate to strong pollution of Cd and Zn, whereas unpolluted to moderately polluted with respect to Co, Cr, Cu, Mn, Ni and Pb. Cd enrichment caused high ecological risk, primarily attributed to anthropogenic activities. Mangrove ecosystems are efficient sequester of trace metals but anthropogenic addition can cause significant fraction of exchangeable metals and pose high ecological risk.
在印度西南海岸高度城市化的热带红树林生态系统的核心沉积物中进行了痕量金属的分布和生态风险评估。金属分布模式如下：Co、Cu、Ni 和 Pb 被吸附到铁氢氧化物和细颗粒沉积物上；Cd 和 Zn 优先被有机质吸附，Cr 被 Mn 氢氧化物捕获。Cd、Pb 和 Zn 在表层沉积物中显著富集，而 Cd、Ni 和 Zn 则存在于金属可交换相中。地质累积指数（I）表明，研究区域的 Cd 和 Zn 污染程度从中等到强，而 Co、Cr、Cu、Mn、Ni 和 Pb 的污染程度为无污染到中度污染。Cd 富集导致高生态风险，主要归因于人为活动。红树林生态系统是痕量金属的有效固定器，但人为添加会导致大量可交换金属，并构成高生态风险。
