Contamination by heavy metals is a serious threat to aquatic systems due to their level of toxicity at elevated levels. The pollution of urban watersheds is of particular concern because of its potential impact on the watershed ecosystem and the receiving larger water bodies. This study assessed the occurrence and distribution of cadmium, copper, nickel, lead and zinc in water and sediment samples collected from three urban watersheds in Lagos, Nigeria. The concentrations of metals were determined using atomic absorption spectrometry. The health risk index (HRI) of water usage was evaluated for both adults and children. HRI for cadmium and lead in some of the watersheds recorded HRI > 1 values, a cause for health concern. The pH of water ranged from 6.48 ± 0.28 - 6.54 ± 0.47 (2016) and 6.18 ± 0.56 - 6.53 ± 0.17 (2018) respectively while, for sediments, the pH values ranged from 6.14 ± 0.48 - 6.9 ± 0.15 and 5.38 ± 0.22 - 6.4 ± 0.38 for 2016 and 2018 respectively. The levels of metals in the water samples during the 2016 sampling cycle were found to be within the World Health Organization (WHO) guideline limits for drinking water. However, the 2018 cadmium, lead and zinc concentrations for Ira-Ipaye and Akesan watersheds exceed the WHO guideline limits. Cadmium was not detected in Ira-Ipaye and Akesan 2016 sediment samples. Statistical t-test and analysis of variance (ANOVA) were used to ascertain significant differences of metals concentration in the three watersheds. The pH and metal concentration values obtained for water and sediment for the year 2016 and 2018 were non-significantly different.
KeywordsMetalsCadmiumLeadWatershedsHealth Risk
Hipp, J.A., Ogunseitan, O., Lejano, R. and Smith, C.S. (2006) Optimization of Stormwater Filtration at the Urban/Watershed Interface. Environmental Science & Technology, 40, 4794-4801. https://doi.org/10.1021/es060520f
United States Environmental Protection Agency USEPA (2008) Application of Watershed Ecological Risk Assessment. EPA/600/R-06/037F, Washington DC.
Huang, X., Chen, H., Xia, F., Wang, Z., Mei, K., Shang, X., Liu, Y., Dahlgren, R.A., Minghua, Z. and Huang, H. (2018) Assessment of Long-Term Watershed Management on Reservoir Phosphorus Concentrations and Export Fluxes. International Journal of Environmental Research & Public Health, 15, 2169. https://doi.org/10.3390/ijerph15102169
Mohammadi, M., Darvishaan, A.K. and Bahramifar, N. (2019) Spatial Distribution and Source Identification of Heavy Metals (As, Cr, Cu, and Ni) at Sub-Watershed Scale Using Geographically Weighted Regression. International Journal of Soil and Water Conservation Research, 7, 308-315. https://doi.org/10.1016/j.iswcr.2019.01.005
Karr, J.R. (1991) Biological Integrity: A Long Neglected Aspect of Water Resources Management. Ecological Applications, 1, 66-84. https://doi.org/10.2307/1941848
Wichelns, D. (2017) Volumetric Water Footprints, Applied in a Global Context, Do Not Provide Insight Regarding Water Scarcity or Water Quality Degradation. Ecological Indicators, 74, 420-426. https://doi.org/10.1016/j.ecolind.2016.12.008
Muller, A., Osterlund, H., Marsalek, J. and Viklander, M. (2020) The Pollution Conveyed by Urban Runoff: A Review of Sources. Science of the Total Environment, 709, 136125. https://doi.org/10.1016/j.scitotenv.2019.136125
Xia, F., Zhang, C., Qu, L., Song, Q., Ji, X., Mei, K., Dahlgren, R.A. and Zang, M. (2020) A Comprehensive Analysis and Source Apportionment of Metals in Riverine Sediments of a Rural-Urban Watershed. Journal Hazardous Materials, 381, 121230. https://doi.org/10.1016/j.jhazmat.2019.121230
Thorpe, A. and Harrison, R.M. (2008) Sources and Properties of Non-Exhaust Particulate Matter from Road Traffic: A Review. Science of the Total Environment, 400, 270-282. https://doi.org/10.1016/j.scitotenv.2008.06.007
Mcelmurry, S.P., Long, D.T. and Voice, T.C. (2014) Storm Water Dissolved Organic Matter: Influence of Land Cover and Environmental Factors. Environmental Science & Technology, 48, 45-53. https://doi.org/10.1021/es402664t
Worms, I.A.M., Chmiel, H.E., Traber, J., Tofield-Pasche, N. and Slaveykova, V.I. (2019) Dissolved Organic Matter and Associated Trace Metal Dynamics from River to Lake, under Ice-Covered and Ice-Free Conditions. Environmental Science & Technology, 53, 14134-14143. https://doi.org/10.1021/acs.est.9b02184
Hao, H., Fenggiong, S., Cao, D., Liu, J. and Jiang, G. (2020) Freezing-Induced Bromated Reduction by Dissolved Organic Matter and the Formation of Organobromine Compounds. Environmental Science & Technology, 54, 1668-1676. https://doi.org/10.1021/acs.est.9b07902
Liu, L., Quyang, W., Wang, Y., Tysklind, M., Hao, F., Liu, H., Hao, X., Xu, Y., Lin, C. and Su, L. (2020) Heavy Metal Accumulation, Geochemical Fractions, and Loadings in Two Agricultural Watersheds with Distinct Climate Conditions. Journal Hazardous Materials, 389, 12125. https://doi.org/10.1016/j.jhazmat.2020.122125
Murray, K.S., Rogers, D.T. and Kaufman, M.N. (2004) Heavy Metals in an Urban Watershed in Southeastern Michigan. Journal Environmental Quality, 33, 163-172. https://doi.org/10.2134/jeq2004.1630
Wang, Y., Wen, A., Guo, J., Shi, Z. and Yan, D. (2017) Spatial Distribution, Sources and Ecological Risk Assessment of Heavy Metals in Shenja River Watershed of Three Gorges Reservoir Area. Journal of Mountain Science, 14, 325-335. https://doi.org/10.1007/s11629-016-3838-1
Chen, Y., Huang, H., Ding, Y., Chen, W., Luo, J., Li, H., Wu, J., Chen, W. and Qi, S. (2019) Trace Metals in Aquatic Environments of a Mangrove Ecosystem in Nansha, Guangzhuo, South China: Pollution Status, Sources and Ecological Risk Assessment. Environmental Monitoring & Assessment, 191, Article No. 629. https://doi.org/10.1007/s10661-019-7732-5
Brown, E.R., Hazdra, J.J., Keith, L., Greenspan, I., Kwapinski, J.B.G. and Beamer, P. (1973) Frequency of Fish Tumors Found in a Polluted Watershed as Compared to Non-Polluted Canadian Waters. Cancer Research, 33, 189-198.
Bonansea, M., Ledesma, C. and Rodriguez, M.C. (2016) Assessing the Impact of Land Use and Land Cover on Water Quality in the Watershed of a Reservoir. Applied Ecology & Environmental Resources, 14, 447-450. https://doi.org/10.15666/aeer/1402_447456
Woldeab, B., Ambelu, A., Mereta, S.T. and Beyene, A. (2018) Effect of Watershed Land Use on Tributaries Water Quality in the East African Highland. Environmental Monitoring & Assessment, 191, Article No. 36. https://doi.org/10.1007/s10661-018-7176-3
Mertz, W. (1981) The Essential Trace Elements, Science, 213, 1332-1338. https://doi.org/10.1126/science.7022654
Mertz, W. (1995) Risk Assessment of Essential Trace Metals: New Approaches to Setting Recommended Dietary Allowances and Safety Limits. Nutrition Review, 53, 179-185. https://doi.org/10.1111/j.1753-4887.1995.tb01548.x
Kellar, C.R., Hassell, K.L., Long, S.M., Myers, J.H., Golding, L., Rose, G., Kumar, A., Hoffmann, A.A. and Pettigrove, V. (2014) Ecological Evidence Links Adverse Biological Effects to Pesticide and Metal Contamination in an Urban Australian Watershed. Journal of Applied Ecology, 51, 426-439. https://doi.org/10.1111/1365-2664.12211
Jaishankar, M., Tseten, T., Anbalgan, N., Mathew, B.B. and Beeregowda, K.N. (2014) Toxicity, Mechanism and Health Effects of Some Heavy Metals. Interdisciplinary Toxicology, 7, 60-72. https://doi.org/10.2478/intox-2014-0009
Kim, H.S., Kim, Y.J. and Seo, Y.R. (2015) An Overview of Carcinogenic Heavy Metal: Molecular Toxicity Mechanism and Prevention. Journal Cancer Prevention, 20, 232-240. https://doi.org/10.15430/JCP.2015.20.4.232
Bornman, M.S., Aneck-Hahn, N.H., De jager, C., Wagenaar, G.M., Bouwman, H., Barnhoorn, I.E.J., Patrick, S.M., Vanderberg, L.N., Kortenkamp, A., Blumbberg, B., Kimmins, S., Jegou, B., Auger, J., DiGangi, J. and Heindel, J.J. (2017) Endocrine Disruptors and Health Effects in Africa: A Call for Action. Environmental Health Perspectives, 125, 085005. https://doi.org/10.1289/EHP1774
Mandeng, E.P.B., Bidjeck, L.M., Bassa, A.Z.E., Ntomb, Y.D., Wadjou, J.W., Doumo, E.P.E. and Dieudonne, L.B. (2019) Contamination and Risk Assessment of Heavy Metals and Uranium of Sediments in Two Watersheds in Abiete-Toko Gold District, Southern Cameroon. Heliyon, 5, e02591. https://doi.org/10.1016/j.heliyon.2019.e02591
Awofolu, O.R., Mbolekwa, Z., Mtshemla, V. and Fatoki, O.S. (2005) Levels of Trace Metals in Water and Sediment from Tyume River and Its Effects on Irrigated Farmland. Water South Africa, 31, 87-94. https://doi.org/10.4314/wsa.v31i1.5124
Adeniyi, A.A., Yusuf, K.A. and Okedeyi, O.O. (2008) Assessment of the Exposure of Two Fish Species to Metals Pollution in the Ogun River Catchments, Ketu, Lagos, Nigeria. Environ Monitoring & Assessment, 137, 451-458. https://doi.org/10.1007/s10661-007-9780-5
Rose, S. and Shea, J.A. (2007) Environmental Geochemistry of Trace Metal Pollution in Urban Watersheds. Developments in Environmental Science, 5, 99-131. https://doi.org/10.1016/S1474-8177(07)05006-1
Ullah, K.A., Jiang, J. and Wang, P. (2018) Land Use Impacts on Surface Water Quality by Statistical Approaches. Global Journal of Environmental Science & Management, 4, 231-250.
Pobi, K.K., Satpati, S., Dutta, S., Nayek, S., Saha, S. and Gupta, S. (2019) Sources Evaluation and Ecological Risk Assessment of Heavy Metals Accumulated within Natural Stream of Durgapur Industrial Zone, India, by Using Multivariate Analysis and Pollution Indices. Journal of Applied Water Science, 9, Article No. 58. https://doi.org/10.1007/s13201-019-0946-4
Yusuf, K.A. and Osibanjo, O. (2006) Trace Metals in Water and Sediments from Ologe Lagoon, Southwestern Nigeria. Pakistan Journal of Scientific & Industrial Research, 49, 88-89.
Adeniyi, A., Yusuf, K., Okedeyi, O. and Sowemimo, M. (2016) Classification and Health Risk Assessment for Borehole Water Contaminated by Metals in Selected Households in Southwest Nigeria. Journal Water Resource & Protection, 8, 459-471. https://doi.org/10.4236/jwarp.2016.84039
America Public Health Association (APHA) (1998) Standard Methods for the Examination of Water and Wastewater, APHA, AWWA, and WPCCE. 20th Edition, America Public Health Association, Springfield, New York, Byrd Progress.
Department of Water Affairs and Forestry (DWAF) (1992) Analytical Methods Manual TR 151. Hydrological Research Institute, DWAF, Pretoria.
Petrosyan, V., Pirumyan, G. and Perikhanyan, Y. (2019) Determination of Heavy Metal Background Concentration in Bottom Sediment and Risk Assessment of Sediment and Risk Assessment of Sediment Pollution by Heavy Metals in the Hrazdan River (Armenia). Journal of Applied Water Science, 9, Article No. 102. https://doi.org/10.1007/s13201-019-0996-7
Dukes, A.D., Eklund, R.T., Morgan, Z.D. and Layland, R.C. (2020) Heavy Metal Concentration in the Water and Sediment of Lake Greenwood Watershed. Water, Air, & Soil Pollution, 231, Article No. 11. https://doi.org/10.1007/s11270-019-4364-x
Adeniyi, A., Dayomi, M., Siebe, P. and Okedeyi, O. (2008) An Assessment of the Levels of Phthalate Esters and Metals in the Muledane Open Dump, Thohoyandou, Limpopo Province, South Africa. Chemistry Central Journal, 2, Article No. 9. https://doi.org/10.1186/1752-153X-2-9
Pentecost, A. (1999) Analyzing Environmental Data. Longman, London.
United States Environmental Protection Agency (USEPA) (2011) Exposure Factors Handbook. USEPA, Washington DC.
Khan, K., Lu, Y., Khan, H., Zakir, S., Ihsanullah, I., Khan, S., Khan, A.A., Wei, L. and Wang, T. (2013) Health Risks Associated with Heavy Metals in Drinking Water of Swat, Northern Pakistan. Journal of Environmental Science, 10, 2003-2013. https://doi.org/10.1016/S1001-0742(12)60275-7
WHO (2011) Guidelines for Drinking Water Quality. 4th Edition, World Health Organization, Geneva.
Adeniyi, A., Osifeko, O., Owoade, O., Omotayo, Y., Ajede, E., Ibrahim, A. and Balogun, R. (2014) Metal Burden as Template for Assessing the Quality of Raw Water Sourced from Two Rivers by Lagos State Water Corporation, Nigeria. In: Bhowon, M.G., Jhaumeer-Laulloo, S., Li Kam Wah, H. and Ramasami, P., Eds., Chemistry: The Key to Our Sustainable Future, Springer, Dordrecht, 163-172. https://doi.org/10.1007/978-94-007-7389-9_12
United States Environmental Protection Agency (USEPA) (2017) Framework for Metals Risk Assessment, Risk Assessment Forum. USEPA, Washington DC.
Licata, P., Bella, G.D., Dugo, G. and Naccari, F. (2003) Organochlorine Pesticides, PCBs and Heavy Metals in Tissues of the Mullet Liza aurata in Lake Ganzirri and Straits in Messina (Sicily, Italy). Chemosphere, 52, 231-238. https://doi.org/10.1016/S0045-6535(03)00271-6
Australian Government Initiative (2000) Guidelines for Fresh and Marine Water Quality—Nickel in Freshwater. https://www.waterquality.gov.au
Tiefenthaler, L.L., Stein, E.D. and Schiff, K.C. (2008) Watershed and Land Use-Based Sources of Trace Metals in Urban Storm Water. Environmental Toxicology & Chemistry, 27, 277-287. https://doi.org/10.1897/07-126R.1
Shen, F., Mao, L., Sun, R., Du, J., Tan, Z. and Ding, M. (2019) Contamination Evaluation and Source Identification of Heavy Metals in the Sediments from the Lishui River Watershed, Southern China. International Journal of Environmental Research & Public Health, 16, 336-349. https://doi.org/10.3390/ijerph16030336
Nor, Y.M. (1987) Ecotoxicology of Copper to Aquatic Biota: A Review. Environmental Research, 43, 274-282. https://doi.org/10.1016/S0013-9351(87)80078-6
Fatima, M., Usmani, N. and Hossain, M.M. (2014) Heavy Metal in Aquatic Ecosystem Emphasizing Its Effect on Tissue Bioaccumulation and Histopathology: A Review. Journal of Environmental Science & Toxicology, 7, 1-15. https://doi.org/10.3923/jest.2014.1.15
Adeniyi, A.A., Owoade, O.J., Shotonwa, I.O., Okedeyi, O.O., Ajibade, A.A., Sallu, A.R., Olawore, M.A. and Ope, K.A. (2011) Monitoring Metals Pollution Using Water and Sediments Collected from Ebute Ogbo River Catchments, Ojo, Lagos, Nigeria. African Journal of Pure and Applied Chemistry, 5, 219-223.
Chanpiwat, P., Lee, B.-T., Kim, K.-W. and Sthiannopkao, S. (2014) Human Health Risk Assessment for Ingestion Exposure to Groundwater Contaminated by Naturally Occurring Mixtures of Toxic Heavy Metals in Lao PDR. Environmental Monitoring & Assessment, 186, 4905-4923. https://doi.org/10.1007/s10661-014-3747-0
Farokhneshat, F., Mahvi, A.H. and Jamali, Y. (2016) Carcinogenic and Non-Carcinogenic Risk Assessment of Chromium in Drinking Water Sources in Birjand, Iran. Research Journal of Environmental Toxicology, 10, 166-171. https://doi.org/10.3923/rjet.2016.166.171