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Chemical characterization of metallic trace elements in aquatic plants: A case study of some plants in Porto Novo lagoon, South Benin

Author Affiliations

  • 1Laboratory of Inorganic Chemistry and Environment (LACIE), Faculty of Science and Technology (FAST), University of Abomey-Calavi, BP: 4521 Cotonou Benin
  • 2Laboratory of Applied Hydrology (LHA), National Institute of Water (INE), University of Abomey-Calavi, 01 BP: 526 Cotonou Benin
  • 3Laboratory of Applied Hydrology (LHA), National Institute of Water (INE), University of Abomey-Calavi, 01 BP: 526 Cotonou Benin
  • 4Laboratory of Applied Hydrology (LHA), National Institute of Water (INE), University of Abomey-Calavi, 01 BP: 526 Cotonou Benin

Int. Res. J. Environment Sci., Volume 9, Issue (4), Pages 66-73, October,22 (2020)

Abstract

The lagoon of Porto-Novo is located in southern part of the republic of Benin. It covers average 30 km2 in dry season and 50 km2in wet season and represents the outlet which through the waters of the Ouémé River flows into the Atlantic Ocean by the Lagos Channel. The main objective of this study is to describe spatial distribution of copper and zinc in sediments but especially in aquatic plants in order to evaluate bioconcentration and to provide further information on heavy pollution by copper and zinc in the lagoon. Sediments, water and six aquatic plants (Typha domingensis, Eichhornia crassipes, Ipomea aquatica, Ludwigia abyssinica, Nymphaea lotus and Cyperus papyrus) samples were collectedat seven sites in the lagoon. The chemical analysis of the two heavy metals (Cu and Zn) was done using standardized spectrophotometer methods. The results were compared to standards and show that the concentrations in the lagoon exceed the recommended values. The pollution should have anthropogenic sources and need to be monitored to avoid damage to ecosystem of this important surface water of Benin.

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