Effectiveness and Toxicity of Chemical Dispersant in Oil Spill Aquatic Environment
Pollution of the marine ecosystem by crude oil spill endangers marine species. The use of chemical dispersants in removing spilled oil from the marine environment by forming oil-in-water emulsions proves to be relatively effective, but the effectiveness is influenced by a number of factors. However, the successful use of these dispersants depends, to a great extent, on the toxicity of the oil-dispersant mixture that forms when dispersants are applied to combat oil spills. In this review, the type and quantity of dispersant used were reported to influence the toxicity of the oil-dispersant mixture on aquatic organisms relative to both the crude oil and the dispersant. The viscosity of oil, the salinity of water and the quantity of dispersants used were discussed as major factors influencing the effectiveness of dispersants. With contrasting results in assessing the overall toxicity of oil-dispersant mixtures on marine life, recommendations were suggested at the end of this review.
Aghalino, S.D. (2009). Corporate response to environmental deterioration in the oil-bearing area of Niger Delta, Nigeria, 1984-2002. Journal of Sustainable Development in Africa, 11(2): 281-295.
Alade, A. and G.E. Anyachukwu (1990). Toxicity of Nigerian crude oil and chemical dispersants to Barbus Sp. and Clarias Sp. Bulletin of Environmental Contamination and Toxicology, 45: 729-733.
Almeda, R., Hyatt, C. and E.J. Buskey (2014). Toxicity of dispersant Corexit 9500A and crude oil to marine microzooplankton. Ecotoxicology and Environmental Safety, 106: 76-85.
Anson, J.G. and G. Mackinnon (1984). Novel pseudomonas plasmid involved in aniline degradation. Applied and Environmental Microbiology, 48(4): 868-869.
Azadeh, Z., Mozhgan, E., Parinaz, P., Sedigheh, M., Samira, B., Daryoush, F. and M. Parisa (2012). Effects of three types of oil dispersants on biodegradation of dispersed crude oil in water surrounding two Persian Gulf Provinces. Journal of Environmental and Public Health, 2012: 981365. doi:10.1155/2012/981365.
Blondina, G.J., Sowby, M.L., Quano, M.T., Singer, M.M. and R.S. Tjeerdema (1997). A modified swirling flask efficacy test for oil spill dispersants. Spill Science and Technology Bulletin, 4: 177-185.
Celestine, A. (2003). Hydrocarbon exploitation, environmental degradation and poverty: The Niger Delta experience. Diffuse Pollution Conference, Dublin. Retrieved from www.ucd.ie/dipcon/docs/theme02/theme02_07.pdf
Chapman, H., Purnell, K., Law, R.J. and M.F. Kirby (2007). The use of chemical dispersants to combat oil spills at sea: A review of practice and research needs in Europe. Retrieved from https://www.itopf.org/fileadmin/data/ Documents/Papers/dispersants_MPB.pdf
Environmental Guidelines and Standards for the Petroleum Industry in Nigeria (EGASPIN) (2018). Department of Petroleum Resources (DPR), Nigeria.
Egberongbe, F.A.O., Nwilo, P.C. and O.T. Badejo (2006). Oil spill disaster along Nigerian coastlines. 5th FIG Regional Conference on Promoting land administration and good governance, Accra, Ghana.
Fingas, M. (2014). A review of literature related to oil spill dispersants 2011-2014. For Prince William Sound Regional Citizens’ Advisory Council (PWSRCAC), Anchorage, Alaska.
Fingas, M. and J. Banta (2019). Review of literature related to oil spill dispersants. Proceedings of the 32nd AMOP Technical Seminar on Environmental Contamination and Response Volume: 2.
Fuller, C., Bonner, J., Page, C., Ernest, A. and T. McDonald (2004). Comparative toxicity of oil, dispersant, and oil plus dispersant to several marine species. Environmental Toxicology and Chemistry, 23: 2941-2949.
George-Ares, A., Lessard, R.R., Becker, K.W., Canevari, G.P. and R.J. Fiocco (2001). Modification of the dispersant Corexit 9500 for use in freshwater. Proceedings: International Oil Spill Conference, Tampa, Florida, March 26-29, 2001, pp. 1209-1211.
Joint Group of Experts on the Scientific Aspects of Marine Pollution (GESAMP, 1991). Reducing environmental impacts of coastal aquaculture. Food and Agriculture Organization of the United Nations, retrieved from http:// www.fao.org/3/u3100e/U3100e00.htm
Haapkylal, J., Ramade, F. and B. Salvat (2007). Oil pollution on coral reefs: A review of the state of knowledge and management needs. Life and Environment, 57(1-2): 91- 107.
Iniaghe, P.O., Tesi, G.O. and O.P. Iniaghe (2013). Environmental degradation and sustainable development in Nigeria’s Niger Delta. Journal of Sustainable Development in Africa, 15(3): 61-78.