人为活动对开普海岸中部Fosu泻湖的影响:重金属污染的综合评估

George Adjei, C. K. Adokoh, J. K. Bentum, G. Hadzi, E. Ameho
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引用次数: 3

摘要

人类和工业排放到环境中的污水对人类健康和水生生物构成严重威胁。鉴于此,使用原子吸收分光光度计(AAS) - (Varian Short Research Article - AA240 FS)测定了从加纳中部地区污染最严重的水体之一(Fosu泻湖)收集的沉积物样品中某些重金属Zn、Pb、Cu、Ti、V和Mn的含量。不同地点的铅(Pb)、锌(Zn)、锰(Mn)、铜(Cu)、钛(Ti)和钒(V)的平均浓度从138.75 mgkg -1 (Ti)到4.90 mgkg -1 (Zn)不等。沉积物样品中重金属含量最高的是Ti (4600 mgkg -1),其次是Mn (290.00 mgkg -1)和Cu (235.93 mgkg -1)。分布顺序为Ti>Mn→V>→Cu>→Pb→Zn。Mn、Cu、Ti和V的平均浓度超过了USEPA和WHO的标准指导值,Pb和Zn的平均浓度低于标准规定限值。各采样点重金属之间的Pearson相关分析普遍较弱,存在正相关和负相关,表明重金属可能来自不同的人为来源。本研究结果与以往在同一泻湖的研究结果进行了比较,结果表明,湖泊周围的人为活动增加,对泻湖造成了潜在的污染威胁,特别是重金属污染物可能对人类和水生生物有毒。
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The Impact of Anthropogenic Activities on the Fosu Lagoon in the Central District of Cape Coast: Integrated Assessment of Heavy Metal Contamination
Effluents from humans and industrial discharges into the environment pose a serious threat to human health and aquatic life. In view of this, levels of some heavy metals Zn, Pb, Cu, Ti, V and Mn were determined in sediment samples collected from one of the most polluted water bodies (Fosu Lagoon) in the central region of Ghana using Atomic Absorption Spectrophotometer (AAS) - (Varian Short Research Article – AA240 FS). The average concentrations of lead (Pb), zinc (Zn), manganese (Mn), copper (Cu), Titanium (Ti) and Vanadium (V), from the various sites ranged from 138.75 mgkg -1 (Ti) to 4.90 mgkg -1 (Zn). Among the concentrations of heavy metals found in the sediment samples, Ti recorded the highest concentration of 4600 mgkg -1 followed by Mn (290.00 mgkg -1 ) and then Cu (235.93 mgkg -1 ). The sequence of distribution followed Ti>Mn ˃ V>Cu>Pb ˃ Zn. The mean concentration of Mn, Cu, Ti and V exceeded the USEPA and WHO standard guideline whiles Pb and Zn were below the standard regulation limits. The Pearson correlation analysis between the heavy metals at the various sampling points was generally weak, with both positive and inverse correlations demonstrating that heavy metals may be coming from different anthropogenic sources. Comparing results from this study with previous works in the same Lagoon showed increased anthropogenic activities around the lake which pose potential pollution threats to the lagoon especially, the heavy metal pollutants which may be toxic to humans and aquatic life.
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