Influence of watershed on the accumulation of heavy metals in sediments of urban rivers under tropical conditions: Case of N’djili and Lukaya rivers in Kinshasa Democratic Republic of the Congo

Joseph B. Tshibanda , Augustin M. Malumba , Pius T. Mpiana , Crispin K. Mulaji , Jean-Paul Otamonga , John W. Poté
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引用次数: 2

Abstract

The contamination of freshwater resource by heavy metals is still a major environmental and human health concern globally. The release of these contaminants into the aquatic environment can lead to the pollution of water resources and generate risks for aquatic living organisms and human health. The sediments can act as reservoir for heavy metals, thereby they are used to assess the pollution status of the rivers. In the present investigation, surface sediments collected from two urban rivers named, N’djili and Lukaya draining through the city of Kinshasa, Democratic Republic of the Congo were characterized for grain size, organic matter (OM) and heavy metals. Additionally, Sediment Quality Guidelines for the protection of aquatic life (SQGs), enrichment factor (EF) and geoaccumulation index (Igeo) were performed to determine the river pollution status. The results highlight high concentrations of heavy metals in sediment samples mainly from N’djili River, reaching the values (mg kg−1) of 180.3 (Cu), 451.5 (Zn), 185.8 (Pb) and 4.1 (Hg). These values exceed the SQGs. Based on EF and Igeo values, the sediments from the two rivers have severe enrichment and polluted with Cu, Zn and Pb, and moderate enrichment of Cr and As. In general, the positive correlation was observed between some heavy metals and OM suggesting that these contaminants could have originated from common sources with a similar transport pathway. Based on the SQGs, EF and Igeo, N’djili River is considered as highly polluted with heavy metals indicating environmental and human health potential risks. The results of this study clearly indicate that the pollution of urban rivers in developing countries can be explained by several anthropogenic activities such as urban runoff, uncontrolled landfills in riverbanks, untreated wastewater from densely populated areas, anarchic commercial and industrial settlements, and heavy road traffic. The approaches used in this study represent a useful tool to assess the river sediment quality of urban river which can be applied to similar environment.

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热带条件下流域对城市河流沉积物中重金属积累的影响:以刚果民主共和国金沙萨的恩吉利河和卢卡亚河为例
淡水资源受到重金属污染仍然是全球一个主要的环境和人类健康问题。这些污染物排放到水生环境中可能导致水资源污染,并对水生生物和人类健康产生风险。沉积物可以作为重金属的储存库,因此它们被用来评估河流的污染状况。在本次调查中,从刚果民主共和国金沙萨市的两条城市河流(恩吉利河和卢卡亚河)中收集的地表沉积物进行了粒度、有机质和重金属的表征。此外,采用沉积物质量指南(SQGs)、富集因子(EF)和地质积累指数(Igeo)来确定河流污染状况。结果表明,主要来自恩吉力河的沉积物样品中重金属浓度较高,分别为180.3 (Cu)、451.5 (Zn)、185.8 (Pb)和4.1 (Hg)。这些值超过sqg。EF和Igeo值表明,两河沉积物中Cu、Zn、Pb富集程度较重,Cr、As富集程度较轻。总体而言,观察到某些重金属与有机质之间存在正相关关系,这表明这些污染物可能来自具有相似运输途径的共同来源。根据sqg、EF和Igeo,恩吉利河被认为是重金属污染严重的河流,表明环境和人类健康存在潜在风险。这项研究的结果清楚地表明,发展中国家城市河流的污染可以用几种人为活动来解释,如城市径流、河岸不受控制的垃圾填埋场、人口稠密地区未经处理的废水、无政府状态的商业和工业住区以及繁重的道路交通。本文所采用的方法为评价城市河流底泥质量提供了一种有效的工具,可应用于类似环境。
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