Abstract
This study aimed at determining the concentrations of trace elements in the groundwater of Abakaliki urban and some abandoned mine sites in the Southern part. Sixteen trace elements were analyzed for each of the twenty water samples collected. Laboratory results showed that the concentration of manganese varied from 4.816 to 11.238 ppm, zinc from 0.126 to 1.403 ppm, copper from 0.198 to 0.967 ppm, lead from 0.005 to 0.010 ppm, arsenic from 0.001 to 0.009 ppm, chromium from 0.009 to 0.025 mg/l, cadmium from 0.003 to 0.011 mg/l, mercury from 0.001 to 0.005 mg/l, nickel from 0.008 to 0.032 mg/l, selenium from 0.001 to 0.011 ppm, iodine from 0.013 to 0.050 ppm, uranium from 0.001 to 0.006 ppm, platinum from 0.009 to 0.032 ppm, tin from 0.014 to 0.015 ppm, lithium from 0.009 to 0.024 mg/l, cobalt from 0.015 to 0.036 mg/l, and iron from 0.010 to 0.980 ppm. These results were analyzed statistically and their distribution modeled using a software package. The results were also compared with world standards for potable water. The comparison showed that water samples are contaminated with trace elements and particularly polluted with, Mn, Hg, and Cd with average concentration values of 8.43, 0.002, and 0.005 mg/l, all above the World Health Organization standard limits of 0.005, 0.001 and 0.003 mg/l, respectively. Concentrations of Fe, Zn, and Ni are above the permissible limits of 0.30, 0.01, and 0.02 mg/l, respectively, in some places. Health hazards like metal poisoning which can result from pollution of this nature cannot be ruled out. Controlling processes such as chemical dissolutions, mechanical weathering and pollution from urban sewage, release the trace elements to the soil system while chemical dilution, otherwise called leaching, streamlines the trace element plumes to the groundwater regime with dispersion processes mixing and spreading the plume. Dispersion trends of the elements show point sources from the southern part, indicating presence of ore deposits, most likely sulfide ores as interpreted from correlation matrix.
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The authors acknowledge with special thanks the contributions of Ifeanyi Oha of the Department of Geology, University of Nigeria Nsukka and Tijani Saliu of the Hydrochemistry laboratory courtesy of UNICEF assisted water and sanitation project office, Federal secretariat, Ibadan Nigeria, in the digital and analytical works, respectively.
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Okogbue, C.O., Ukpai, S.N. Evaluation of trace element contents in groundwater in Abakaliki metropolis and around the abandoned mine sites in the southern part, Southeastern Nigeria. Environ Earth Sci 70, 3351–3362 (2013). https://doi.org/10.1007/s12665-013-2401-4
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DOI: https://doi.org/10.1007/s12665-013-2401-4