International Journal of Research in Environmental Studies
ISSN: 2059-1977
Vol. 5(5), pp. 56-69, September 2018



Seasonal and spatial variability of physicochemical parameters of a semi enclosed lagoon system: the complex of Lake Zowla-Aného Lagoon

Hodabalo Dheoulaba SOLITOKE1,2*, Kamilou OURO-SAMA1,2, Gnon TANOUAYI1,2, Tchaa Esso-Essinam BADASSAN1,2, Housseni AHOUDI1,2, Akoétê Yaovi NYAMETSO1,2, Akouvi Massan Duanyawo AVUMADI1,2 and Kissao GNANDI1,2

1Université de Lomé, Faculté des Sciences, Laboratoire de Gestion, Traitement et valorisation des déchets, BP. 1515, Lomé -Togo.
2Université de Lomé, Faculté des Sciences, Département de Géoscience et Environnement, BP.1515, Lomé-Togo.

*To whom correspondence should be addressed. E-mail: dominiquesolitoke@yahoo.fr.

Received 28 June, 2018; Received in revised form 30 July, 2018; Accepted 03 August, 2018.

Abstract


Keywords:
Physicochemical parameters, Waters, Lagoon system, Lake Zowla, Togo.


The semi-closed lagoon ecosystems such as the complex of Lake Zowla-Aného Lagoon are ecosystems whose functioning are influenced by the inflow of fresh continental water and marine water. In order to determine the seasonal variations of the physico-chemical parameters of the waters, a study was made during the dry and the rainy seasons of 2017, on 18 samples of water collected from the complex Lake Zowla-Aného Lagoon. For this study, 17 physico-chemical parameters were evaluated using standard methods according to AFNOR. The pH and the temperature gave averages of 7.59 and 31.02°C respectively, in the dry season, as against 7.2 and 27.46°C in the rainy season. The conductivity and salinity, and Ca2+, Na+, and C- values were found to be 37466.66 μS/cm, 21.34 g/L, 246.43 mg/L; 4205.25 mg/L and 11811.95 mg/L respectively, in the dry season; and were higher than the values obtained from samples collected in the rainy season, which were 3640.22 μS/cm, 1.9 g/L, 14.31 mg/L, 31.74 mg/L and 1104.07 mg/L, respectively. These results show the influence of marine and continental waters on the lagoon system. The values of nitrates, phosphates and ammonium obtained from samples collected in the dry season which were 1.42, 0.72 and 0.06 mg/L were lower than the values of the rainy season (2.65, 1.24 and 0.42 mg/L, respectively). These results confirmed their continental origin.

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