Distribution of 26 Metals in the Waters of the Aquatic Ecosystems of the Cotonou Channel and Lake Nokoué, Benin

Metallic elements have various origins: natural and anthropogenic sources as geochemical, marine atmospheric resulting from the fallout of pollutants emitted or dust raised which are transported by water air currents. Thus marine, brackish fresh continental waters may high metal concentrations. In addition, some essential metals can become toxic above certain concentration values in aquatic environments. The ecosystems Cotonou channel lake Nokoué receive charges town cities Cotonou, Abomey-Calavi hall So Ava. aim this study is to analyze Eighteen (18) stations identified two (nine ecosystem). concentrations magnesium (Mg), calcium (Ca), vanadium (V), chromium (Cr), manganese (Mn), iron (Fe), cobalt (Co), nickel (Ni), copper (Cu), zinc (Zn), arsenic (As), selenium (Se), cadmium (Cd), beryllium (Be), aluminum (Al), strontium (Sr), molybdenum (Mo), silver (Ag), tin (Sn), barium (Ba), platinum (Pt), mercury (Hg), thallium (Tl), lead (Pb), thorium (Th) uranium (U) were measured after acid digestion samples using inductively coupled plasma source mass spectrometer (ICP-MS). results analyses indicate an unequal distribution different ecosystems. However, atypical observed at channel. Magnesium, very Lake respectively Ganvié market station GAN_M (2990 ± 105 mg/L), center, GAN_C (4991 177 mg/L) middle MLak4 (10662 17.03 μg/L). On other hand, iron, Channel Agbato AGB (5236 103 8289 519 μg/L) estuary EST (6118 68 compared wells cborehole sixth neighborhood Cotonou. We used statistical analyzers such MANOVA made it possible classify studied groundwater Well waters. use hierarchical clustering on principal components identify similarities between based with R software packages “FactoMineR” “factoextra”. general, we conclude that most except major (Ca Mg) could provide geochemical sources.