The daily variability of the physicochemical quality of M'koa Lake of Jacqueville depends on biotic and abiotic factors of the flowing water that can interact with each other. The objective of the study is to evaluate the influence of these factors on the variability of physicochemical quality by continuous sampling. This variability of M'koa Lake was studied during daily 24-hour cycles on average in june and august 2014. Insitu measurements and chemical analyzes of 24-hours continuous sampling samples of the lake station were conducted. For each of the two study periods, the results varied from 6.07 to 8.08 and 6.47 to 8.17 for the pH, 27.83 to 28.33 °C and 26.75 to 28.60 °C for the temperature, from 59.30 to 113.90% and 55.95 to 87.34% for dissolved oxygen saturation and from 77.97 to 229.27 mgO 2 /L and 23.33 to 176.22 mgO 2 /L for the chemical oxygen demand in june and august, respectively. Daily variability with gap of dissolved oxygen of 54.60% and 31.40% in june and august are noted, respectively. In fact, the magnitude of these differences reflects the H. Y. KPIDI et al. / Int. J. Biol. Chem. Sci. 11(2): 901-910, 2017 902 dependence of the dissolved oxygen contents on the intensity of a possible algal proliferation and biomass mineralization and thus characteristic of the degraded physicochemical quality of Jacqueville M'koa Lake.

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In this study, anionic surfactants concentrations and other physico-chemical parameters of surface water quality were assessed in the water of M'Koa Lake in the city of Jacqueville (Côte d'Ivoire). Three sampling campaigns were conducted at different seasons at six (6) sampling stations, identified in M'koa Lake by taking into account potential sources of pollution. The analyses of physico-chemical parameters were carried out using both the French AFNOR standard and the methods described by Rodier. The anionic surfactants concentrations were performed by using the methylene blue colorimetric method. The average concentrations of anionic surfactants in the water of M'koa Lake ranged from 0.23 ± 0.04 mg•L −1 to 1.43 ± 0.68 mg•L −1. They are high compared to both population density and socioeconomic activities of Jacqueville's town. These values can be explained by the characteristics of the studied Lake that do not allow enough dilution of the discharged effluent. The results indicate that M'koa Lake is subjected to harmful pollution by anionic surfactants. And among the physicochemical parameters studied, only turbidity and transparency values show water quality deterioration, favoured by wastewater discharge and direct human activities around the Lake.

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