TITLE:
Physico-Chemical Analysis of Eutrophication’s Parameters in a Coastal River (Côte D’ivoire)
AUTHORS:
Koffi Sébastien Ouffoué, Moreto Salla, Denis Yapo Kicho, Dodiomon Soro, Kouhété Philippe Da, Zanahi Félix Tonzibo
KEYWORDS:
Water Quality, Nutriments, Chlorophyll A, Pollution, Eutrophication, River, Côte d’Ivoire
JOURNAL NAME:
Journal of Environmental Protection,
Vol.5 No.13,
October
23,
2014
ABSTRACT: A study on some physico-chemical and biological variables of water
quality was conducted on a coastal river in Ivory Coast. It’s the first
assessment on water quality state. Those coastal rivers actually play an
important role in the physical, biological and hydrological exchange between
lagoons and the sea. Unfortunately, they are not taken into account by the
national monitoring for water quality (RNO-CI). The samples were collected
along Boubo River body through three stations, in the south of Cote d’Ivoire,
during two years. Results show sharp fluctuations of the concentration N-NO3- nitrate, N-NH4+ ammonium and chlorophyll a with
more than 20% variation. However, small fluctuations were noted for
temperature, pH and conductivity with 4% - 20%. Measures are generally inferior
to the threshold for hazardous water class. But respective average
concentrations of N-NO3-, P-PO43-, COD and BOD5 are above natural water
threshold, representing 67% of the analyzed samples of P-PO43- and 100% of the other. These results show
that the river is not exempt of pollution: 0.2 mg/l of P-PO43- and 0.9 mg/l of N-NO3- are the limits of appropriate siege for the
proliferation of invasive aquatic plants (IAP).