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首页> 外文期刊>Environmental Monitoring and Assessment >Assessment of heavy metals in soils and groundwater in an urban watershed of Yaounde (Cameroon-West Africa)
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Assessment of heavy metals in soils and groundwater in an urban watershed of Yaounde (Cameroon-West Africa)

机译：对雅温得（喀麦隆-西非）城市集水区土壤和地下水中的重金属进行评估

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摘要

The aim of this study was to investigate the heavy metals concentrations in soils and groundwater within the Ntem watershed in Yaounde, to prevent the risk on the public health. Soils investigated were sampled in five (05) representative profiles at the surface and the bottom of the unsaturated zone of each profile. Soil samples were air-dried and ground to pass through a 2-mm sieve, and different soil extracts were prepared for chemical analysis (organic matter, cation exchange capacity and pH). By soil digestion method with diacid, total Pb, Cd, Cr and Ni were extracted and determined by atomic absorption spectrophotometry (AAS). Representative groundwater samples were also collected directly from some soil profiles and analysed using AAS instrument after filtration. Average metals concentrations in groundwater were higher than those of the World Health Organisation (WHO) norms. Besides, the geo-accumulation indices (Igeo) were ranged between zero and one (01), except Cd (PI<1). The integrated pollution index (IPI) values were ranged in descending order for soil pollution level as follows: Mollic Gleysols (3.47-4.94)>Plenthic Gleysol (1.89)>Xanthic Ferralsol (1.79)>Rhodic Ferralsol (1.69). The soils and groundwater pollution observed may be a severe threat for the public health in this watershed.
机译：这项研究的目的是调查雅温得Ntem流域内土壤和地下水中的重金属含量，以防止危害公共健康。在每个剖面的不饱和区域的表面和底部，以五（05）个代表性剖面对被调查的土壤进行采样。将土壤样品风干并磨碎，使其通过2毫米的筛子，并准备了不同的土壤提取物用于化学分析（有机物，阳离子交换容量和pH）。通过二酸土壤消解法，提取总铅，镉，铬和镍，并通过原子吸收分光光度法（AAS）测定。代表性的地下水样品也直接从一些土壤剖面中收集，并在过滤后使用AAS仪器进行分析。地下水中的平均金属浓度高于世界卫生组织（WHO）的标准。此外，土壤铅（0.13-0.19），铬（0.13-0.16）和镍（0.09-0.11）的土壤累积指数（Igeo）介于零和一之间（0 1），而镉（PI <1）除外。综合污染指数（IPI）值按土壤污染水平从高到低的顺序排列如下：软体二甲酚（3.47-4.94）>千足二甲酚（1.89）>黄嘌呤草酸酯（1.79）> ho草草酸酯（1.69）。在该流域，观察到的土壤和地下水污染可能对公众健康构成严重威胁。

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