Physicochemical Properties and Levels of Heavy Metals in Selected Rivers within the Kumasi Metropolis of Ghana

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Author(s) Michael Baah Mensah | Nathaniel Owusu Boadi | Frimpomah Baa-Poku | David Dotse Wemegah | Mercy Badu | Selina Ama Saah | Bernard Osei-Dei
Pages 616-623
Volume 5
Issue 12
Date December, 2016
Keywords Heavy Metals, Physicochemical Properties, River, Wiwi, Sisan

The quality of water from the Wiwi River (WR) and Sisan River (SR) in the Kumasi metropolis was investigated. The quality of the water was assessed by determining the physicochemical parameters such as, temperature, total dissolved solids (TDS), conductivity, turbidity, dissolved oxygen (DO), biochemical oxygen demand (BOD) and chemical oxygen demand (COD), and heavy metals (Manganese (Mn), Iron (Fe), Copper (Cu), Zinc (Zn) and Lead (Pb)). The heavy metals concentrations were determined with the Flame Atomic Absorption Spectrometer (AAS). The temperature ranged from 22 – 29 oC and pH from 7.38 – 7.58. The TDS, conductivity and turbidity ranged from 118 – 485 mg/l, 235 – 920 µS/cm and 17.16 – 485 ntu respectively. The DO, BOD and COD concentrations ranged from 1.73 – 7.12 mg/l, 15 – 126 mg/l and 33 – 286 mg/l respectively. The concentrations of Mn, Fe, Cu, Zn and Pb in the rivers ranged from 0.036 – 0.191 mg/l, 0.273 – 0.521 mg/l, 0.274 – 0.51 mg/l, 0.048 – 0.104 mg/l and 0.018 – 0.098 mg/l respectively. Mn, Fe, Cu and Zn concentrations in the rivers were below the World Health Organization (WHO) recommended values. However, the concentrations of Pb in the rivers were above the WHO threshold. The highest Pb concentration was found in the Sisan River whilst the lowest was found in the Wiwi River. The quality of water from the rivers under study was found to be below standard and the high concentrations of lead pose serious health risks to residents who rely on these rivers as their sources of drinking water

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