[1] O. S. Adefemi and E. E. Awokunmi, “The impact of municipal solid waste disposal in Ado Ekiti metropolis, Ekiti State, Nigeria,” African Journal of Environmental Science and Technology, vol. 3(8), pp. 186-191, 2009.
[2] I. A. Ololade, “An assessment of heavy metal contamination in soils within auto-mechanic workshops using enrichment and contamination factors with geoaccumulation indexes,” Journal of Environmental Protection, vol. 5, pp. 970-982, 2014. http://dx.doi.org/10.4236/jep.2014.511098
[3] I. G. J. Zwolsman, W. G. Berger and M. T. G. Vaneck, “Sediment accumulation rates. Historical input, post depositional mobility and retention of major elements and trace metals in salt marsh sediments of the Scheldt Estuary, SW Netherlands,” Marine Chemistry, vol. 44, pp. 73-94, 1993. http://dx.doi.org/10.1016/0304-4203(93)90007-B.
[4] H. D. Loring and, R. Rantala “Manual for geochemical analyses of marine sediments and suspended particulate matter,” Earth-Science Review, vol. 32, pp. 235-283, 1992. http://dx.doi.org/10.1016/0012-8252(92)90001-A
[5] L. F. H. Niencheskil, L. H. Windom and R. Smith, “Distribution of particulate trace metal in Patos Lagoon Estuary (Brazil),” Marine Pollution Bulletin, vol. 28, pp. 96-102, 1994. http://dx.doi.org/10.1016/0025-326X(94)90545-2.
[6] P. Razos and A. Christides, “An investigation on heavy metals in an industrial area in Greece,” International Journal of Environmental Resources, vol. 4, no. 4, pp. 785-794, 2010.
[7] J. R. Okalebo, K. W. Gathua and, P. L. Woomer, “Laboratory methods of soil and plant analysis: A working manual,” 1993.
[8] A. S. Likuku, K. B. Mmolawa, G. K Gaboutloeloe, “Assessment of heavy metal enrichment and degree of contamination around the copper-nickel mine in the Selebi Phikwe Region, Eastern Botswana,” Environment and Ecology Research, vol. 1(2), pp. 32-40, 2013.
[9] L. Håkanson, “Ecological risk index for aquatic pollution control. A sedimentological approach,” Water Research, vol. 14, pp. 975–1001, 1980.
[10] D. L. Tomlinson, J. G. Wilson, C. R. Harris and D. W. Jeffrey, “Problem in the assessment of heavy metals levels in estuaries and the formation of a pollution index,” Helgoländer Meeresuntersuchungen, vol. 33, pp. 566–575, 1980.
[11] U. Usero, A. Garcia and J. Fraidias, “Calidad de lasaguasysedimentos del LitoralAndalaz,” In: Sevilla, Ed. Jun ta de Andalicia, Consejeria del Medio Ambiente, 164, 2000.
[12] F. Cabrera, L. Clemente, E. Diaz Barrientos, R. Lopez and J. M. Murrilo, “Heavy metal pollution of soils affected by the Guadiamar toxic flood,” Science of the Total Environment, vol. 242, pp. 117-129, 1999.
[13] W. H. Liu, J. Z. Zhao, Z. Y. Ouyang, L. Soderlund and G. H. Liu, “Impacts of sewage irrigation on heavy metal distribution and contamination in Beijing, China,” Environmental International, vol. 31, pp. 805-812, 2005.
[14] G. M. S. Abrahim, “Holocene sediments of Tamaki Estuary: Characterization and impact of recent human activity on an urban estuary in Auckland, New Zealand,” PhD Thesis, University of Auckland, Auckland (New Zealand), 2005, p. 361.
[15] P. Adamo, M. Arienzo, M. Imperato, D. Naimo, G. Nardi and D. Stanzione, “Distribution and partition of heavy metals in surface and subsurface sediments of Naples City Port,” Chemosphere, vol. 61, pp. 800-809, 2005.
[16] J. Valdes, G. Vargas, A. Sifeddine, L. Ortlieb and M. Guinez, “Distribution and enrichment of heavy metals in Mejillones bay (23 S), Northern Chile: Geochemical and statistical approach,” Marine Pollution Bulletin, vol. 50, pp. 1558-1568, 2005.
[17] G. A. Birth, “A scheme for assessing human impacts on coastal aquatic environments using sediments,” C. D. Woodcoffe and R. A., Furness, Eds., Coastal GIS 2003, Wollongong University Papers in Centre for Maritime Policy, 14, 2003, Wollongong.
[18] R. A. Sutherland, C. A. Tolosa, F. M. G. Tack and M. G. Verloo, “Characterization of selected element concentration and enrichment ratios in background and anthropogenically impacted roadside areas,” Archives of Environmental Contamination and Toxicology, 38: 428–438, 2000.
[19] P. Buat-Menard and R. Chesselet, “Variable influence of atmospheric flux on the trace metal chemistry of oceanic suspended matter,” Earth and Planetary Science Letters, No.42, pp. 398–411, 1979.
[20] K. Loska, D. Wiechula, B. Barska, E. Cebula and A. Chojnecka, “Assessment of arsenic enrichment of cultivated soils in Southern Poland,” Polish Journal of Environmental Studies, vol. 12, pp. 187-192, 2003.
[21] M. Kargar, N. A. Khorasani, M. Karami, G. H. Rafiee and R. Naseh, “An investigation on As, Cd, Mo and Cu contents of soils surrounding the Meyduk tailing dam,” International Journal of Environmental Research, vol. 6, no. 1, pp. 173-184, 2012.
[22] G. Muller “Index of geoaccumulation in the sediments of the Rhine River,” Geojournal, vol. 2, pp. 108-118, 1969.
[23] K. Loska, J. Cebula, J. Pelezar, D. Wiechula and J. Kwapulinski, “Use of enrichment and contamination factors together with geoaccumulation indexes to evaluate the content of Cd, Cu, and Ni in the Rybnik Water Reservoir in Poland,” Water, Air and Soil Pollution, vol. 93, pp. 347-365, 1997.
[24] G. Muller, “Die Schwermetallbelstung der sediment des Neckars und seiner Nebenflusse: EineBestandsaufnahme,” ChemikerZeitung, vol. 105, pp. 156-164.
[25] Department of Petroleum Resources, “Environmental guidelines and standards for the petroleum industry in Nigeria (revised edition),” Department of Petroleum Resources, Ministry of Petroleum and National Resources, Abuja, Nigeria, 2002.
[26] E. U. Etim and G. U. Adie, “Assessment of toxic heavy metal loading in topsoil samples within the vicinity of a limestone quarry in South Western Nigeria,” African Journal of Environmental Science and Technology, vol. 6, no. 8, pp. 322-330, 2012.
[27] R. Charlatchka and P. Cambier, “Influence of reducing conditions on solubility of trace metals in contaminated soil,” Journal of Water, Air and Soil Pollution, vol. 118, pp. 43-168, 2002.
[28] E. O. Adaikpoh, “Distribution and enrichment of heavy metals in soils from waste dump sites within Imoru and environs, Southwest, Nigeria,” Journal of Environment and Earth Science, vol. 3, pp. 45-54, 2013.
[29] S. Yufang, C. Ying, P. Wu and Y. Yibin, “Health risk assessment of heavy metals in vegetables grown around battery production area,” Scientia Agricola, vol. 71, no. 2, pp. 126-132, 2014.