Assessment of toxic metal contamination with ecological risk of surface water and sediment of Korotoa River in Bangladesh

Ram Proshad, M. Islam, Tapos Kormoker, Md Abdul Kaium Masud, M. Ali
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引用次数: 17

Abstract

Toxic metal contamination is a major problem globally, especially in developing countries. In this study, the levels of toxic metals such as Cr, Ni, Cu, As, Cd and Pb in surface water and sediment of Korotoa River of Bogra City, Bangladesh were investigated. The average concentration of Cr, Ni, Cu, As, Cd and Pb in studied sediment were 1.01, 0.89, 1.98, 6.02, 0.0054 and 0.469 mg/kg, respectively. In the water sample, the mean concentration of Cr, Ni, Cu, As, Cd and Pb were 1.13, 1.33, 3.02, 2.62, 0.75 and 0.81 mg/kg, respectively. A huge amount of municipal wastes, industrial effluents and agricultural runoff from the periphery of Bogra City notably are dumped to this river. Most of the effluents channeled into these rivers are not treated. Considering the sampling sites, the decreasing order of total metal concentration in water samples were Cu > As > Ni > Cr > Pb > Cd and in sediment were As > Cu > Cr> Ni > Pb > Cd. Total average concentrations of Cr, Ni, Cu, As, Cd and Pb in the water samples were higher than WHO guidelines for drinking water quality. This contamination level implied that the condition is much frightening and probably severely affecting the aquatic ecology of the river.  
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孟加拉国科罗托阿河地表水和沉积物中有毒金属污染的生态风险评价
有毒金属污染是一个全球性的主要问题,特别是在发展中国家。本研究调查了孟加拉国Bogra市Korotoa河地表水和沉积物中Cr、Ni、Cu、as、Cd和Pb等有毒金属的含量。研究沉积物中Cr、Ni、Cu、As、Cd和Pb的平均浓度分别为1.01、0.89、1.98、6.02、0.0054和0.469 mg/kg。水样中Cr、Ni、Cu、As、Cd和Pb的平均浓度分别为1.13、1.33、3.02、2.62、0.75和0.81 mg/kg。博格拉市周边的大量城市垃圾、工业废水和农业径流被倾倒到这条河中。流入这些河流的大部分污水都没有经过处理。从采样地点来看,水样中总金属浓度的降序为Cu > As > Ni > Cr> Pb > Cd,沉积物中总金属浓度的降序为As > Cu > Cr> Ni > Pb > Cd。水样中Cr、Ni、Cu、As、Cd和Pb的总平均浓度均高于WHO饮用水水质标准。这种污染程度表明情况非常可怕,可能会严重影响河流的水生生态。
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