Anionic Surfactants Levels in M'Koa Lake Water (Jacqueville, Cote d'Ivoire)

摘要

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 (Cote d'lvoire). 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 colorime-tric 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 socio-economic 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.