Runoff was collected from three different roofing materials that are commonly used for roofing in Ile-Ife, Nigeria, between the months of June to August, 2004. The samples were collected in four geographical locations in the town. The run offs were analysed for pH, Temp, TDS, CI- , S042-, PO43-, N032-, EC and some heavy metals both as regards total, dissolved and particulate fractions. Analysis of the heavy metals was done using flame Atomic Absorption Spectrophotometer. The quantity of these parameters varies with the different roofing materials. In terms of dissolved metals, Fe is the most predominant metal with mean values 0.59 ï¿½ 0.29, 0.82 ï¿½ 0.14, and 1.04 ï¿½ 0.27 mg/L for asbestos, ceramic tiles and metal sheets respectively. The tendency of the roofing materials to release dissolved metals is arranged as follows: Zn, Cr and Fe (metal sheet > Ceramic > asbestos); Cd and Pb (asbestos > ceramic > metal sheet). In terms of particulate metals, the concentration of Cd and Pb are higher in the asbestos than other roofing stuffs. The sequence of their predominance in asbestos is as follows: Pb (0.83?0.55 mg/L) > Cd (0.29 ? 0.07 mg/L). In all the roofs, both particulate and dissolved metals except Zn exceeded WHO permissible limits for drinking water. The high levels of the metals obtained in this study may likely result in consumer complaints since some of the metals are not only carcinogenic but are also liable of impacting bad taste in water.
Alloway, B. J. and Ayres, D. C., (1997). Chemical principles of environmental pollution. 2nd. Ed., Blackie Academic and Professional, 196
Astruc, A., Astruc, M., Belgium, S. and Mericam, P., (1979). Qualite chimique des aux de ruisselement dâ€™une vile moyenne. T.S.M. Lâ€™EAU., 74 (2), 79-85 (7 Pages)
Bannerman, R. (1994). Sources of urban storm water pollutants
defined in Wisconsin. Techniq Tech. Note 15. Water Protect., 1 (1), 30-31 (2 Pages)
Bannerman, R., (1991). Pollutants in Wisconsin storm water. unpublished report by the Wisconsin Department of Natural Resources, Madison, W.
Campbell, D., (1993). Asbestos roofing and safety. Raindrop., , 7-12 (6 Pages)
Chang, M. and Crawley, C. M., (1993). Preliminary observations on water quality of storm runoff from four selected residential roofs. Wat. Res. Bull., 29 (5), 777-783 (7 Pages), DOI: 10.1111/j.1752-1688.1993.tb03237.x. Abstract | Full Text (112 K)
Dannecker, W., Au, M. and Stechmann, H., (1990). Substance load in rainwater runoff from different streets in Harmburg. Sci. Tot. Envron., 93, 385-392 (8 Pages)Abstract
EPA., (1990). National water quality inventory. 1988 Report to Congress. U.S. EPA(Environmental Protection Agency, ), EPA 440-4-90-003, Office of Water, Washington, D.C.
Foster, J. (1996). Patterns of roof runoff contamination and their potential implications in practice and regulation of treatment and local infiltration. Wat. Sci. Tech., 33 (6), 39-48 (10 Pages), DOI: 10.1016/0273-1223(96)00329-0. Abstract
Gadd, J. and Kennedy, P. (2001). House runoff: is it as clean as we think?. Second South Pacific Stormwater Conference.
Good, J. C., (1993). Roof runoff as a diffuse source of metals and aquatic toxicity in storm water. Wat. Sci. Tech., 28 (3-5), 317-322 (6 Pages)
Gromaire-Mertz, M. C. Garnaud, S. Gonzalex and A. Chebbo,G., (1999). Characterization of urban run off pollution in Paris. Wat. Sci. Tech., 39 (2), 1-8 (8 Pages)
Hart, B. T. and Davies, S. H. R, (1981). Trace metal speciation in three Victorian lakes.. Aust. J. Marine Freshwater Res., 32, 175-189 (15 Pages), DOI: 10.1071/MF9810175. Abstract
Marsalek, J., (1986). Toxic contaminants in urban runoff. Urban runoff pollution. Torno, H., Marsalek, J., and Desbordes, M., Eds., Springer Verlag, Berlin., , 39-57 (19 Pages)
Milner, B. and Peterside J. W., (1984). Introduction to atomic absorption spectrometry scientific and equipment. annonymous 13
Pitt, R. and Barron, P., (1989). Assessment of urban and industrial storm water runoff toxicity and the evaluation/ development of treatment for runoff toxicity abasement. Phase 1. A report for the U.S. Environmental Protection Agency, Storm and Combined Sewer Pollution Program,Edison, NJ.
Saget, A. (1994). Base de donnees sur la qualite des rejects urbans de temps de pluie; distribution de la pollution rejetee,dimension des outrages dâ€™interception. Ph.D. Thesis, Ecole Nationale des ponts et Chaussees, Paris, France, 333.
Sartor, J. P. and Boyd, G. B., (1972). Water pollution aspects of streets surface contaminants. EPA- R2 â€“ 72- 081, U.S Environmental Protection Agency. Abstract | Full Text
Thomas, P. R. and Greene, G. R., (1993). Rain water quality from different roof catchments. Water science and technology. 28 (3-5), 291-297 (7 Pages)
WHO, (1996). Guidelines for drinking water quality. 2nd. Ed.,World Health Organization, Geneva, 2. Full Text
Xanthopolous, C. and Halin, H. H., (1993). Anthropogenic wash off from street surfaces. 5th. International Conference on Urban Storm Drainage, Niagora Falls, Ontario, Canada. Marsalek, J. and Torno, H. C. Eds.Seapoint Publishing British Columbia. , 417-422 (6 Pages)