Department of Plant and Environmental Biology, University of Ghana, P.O. Box LG 55. Legon, Accra, Ghana.
Department of Animal Biology and Conservation Science, University of Ghana, P.O. Box LG 67. Legon, Accra, Ghana.
Environ Monit Assess. 2023 Sep 4;195(10):1140. doi: 10.1007/s10661-023-11684-x.
This study compared Lead (Pb), Chromium (Cr), Copper (Cu), Zinc (Zn), Mercury (Hg), Arsenic (As) and Cadmium (Cd) concentrations in sediment, water, and biota at Vaughan Dam which receives limited sewage effluent discharge from residential areas, and Korle Lagoon which receives industrial effluents, electronic waste, garages-spill oil and a host of others in addition to residential sewage effluent discharge. Samples were analyzed with Atomic Absorption Spectrometer. The results showed that concentrations of trace metals were generally higher in the sediment, water, and plants from the Korle Lagoon but only Cu in the sediment of Korle Lagoon showed a significantly high concentration. The similarities in the rank orders of the metal concentrations together with the dominance of Zn and Pb in most compartments of the wetlands indicated major differences did not exist in the contaminant input to the two wetlands except electronic waste recycling and disposal that resulted in significantly high copper concentrations in the sediment of Korle Lagoon. No evidence of biomagnification was determined along the food chains of the Vaughan Dam and the Korle Lagoon for all the metals studied.The Tilapia zilli from Vaughan Dam, the only biota that is regularly consumed from the wetlands, had Cr, Cu, Pb, Cd, Hg, and As concentrations above FAO/WHO permissible limits and therefore pose a health risk to consumers.
本研究比较了 Vaughan 大坝沉积物、水和生物体内的铅 (Pb)、铬 (Cr)、铜 (Cu)、锌 (Zn)、汞 (Hg)、砷 (As) 和镉 (Cd) 浓度，Vaughan 大坝仅接收来自居民区的有限污水排放，而科勒泻湖则接收工业废水、电子废物、车库溢油以及除居民区污水排放外的其他大量污水。样品用原子吸收光谱仪进行分析。结果表明，Korle 泻湖的沉积物、水和植物中的痕量金属浓度通常较高，但只有 Korle 泻湖的沉积物中的 Cu 显示出明显的高浓度。金属浓度的等级顺序相似，以及 Zn 和 Pb 在湿地大多数隔室中的主导地位表明，除电子废物回收和处置导致 Korle 泻湖沉积物中 Cu 浓度显著升高外，两个湿地的污染物输入没有明显差异。在 Vaughan 大坝和科勒泻湖的食物链中，没有发现所有研究金属的生物放大迹象。从湿地定期食用的唯一一种生物——Tilapia zilli，其 Cr、Cu、Pb、Cd、Hg 和 As 浓度均超过 FAO/WHO 允许限量，因此对消费者构成健康风险。
