eng Science and Education Publishing American Journal of Water Resources 2333-4819 2022-08-14 10 2 68 71 10.12691/ajwr-10-2-5 AJWR20221025 article CHODATON ZINSOU Marthe Dominique marthezinsou@hotmail.fr 1 ADJE Ad¨¦kounl¨¦ Hospice Christian 1 DEGBE Cossi Georges Epiphane 1 DOGBEDA Mawulolo Yao Azumah 2 SOHOU Zacharie 2 3 Institut de Recherche Halieutique et Oc¨¦anologique du B¨¦nin, Centre B¨¦ninois de la Recherche Scientifique et de l¡¯Innovation, Cotonou, R¨¦publique du B¨¦nin Regional Marine Centre, University of Ghana, Legon, Republic of Ghana Donaten¡¯s Ecological and Biological Important Area is subject to anthropogenic pressure; resulting in its pollution. This study has enabled the assessment of pollution of its maritime part with a view to its preservation. Thus, physico-chemical parameters such as color, temperature, pH, dissolved oxygen, oxygen saturation, salinity, TDS were recorded in situ in three different points on the coast, two of which showed evidence potential pollution. Water samples were taken in these points for determination of BOD5 and COD, concentration of suspended solids, ammoniacal nitrogen, total nitrogen, nitrates, orthophosphate, total phosphorus, copper, zinc, lead and cadmium using standard methods. The results of physico-chemical characteristics recorded, namely temperature (29.8°C to 30.1°C), suspended solids (1.41 to 42.3 mg/L), pH (6.4 to 6.9), dissolved oxygen concentration (5.4 mg/L to 6.2 mg/L), oxygen saturation (80 to 94), salinity (29.8 to 32.1 g/L), TDS (29513 to 31533 mg/L), COD (<5 to 26 mg/L), BOD (< 1 to 18 mg/L), ammoniacal nitrogen (<0.05 to 2.89 mg/L), nitrates (0.27 to 0.32 mg/L), total kjedahl nitrogen (3.8 and 7.1 mg/L), ortho phosphate (0.002 to 0.47 mg/L), total phosphorus (0.73 to 2.2 mg/L), copper (0.01 to 1.13 mg/L), zinc (1.53 to 2.41 mg/L), lead (<0.001 at 0.022 mg/L) and cadmium (0.008 to 0.012 mg/L) revealed that Donaten¡¯s Ecological and Biological Important Area was not polluted with organic and metallic trace elements pollutants. This study could form a basis for further scientific studies. http://pubs.sciepub.com/ajwr/10/2/5/ajwr-10-2-5.pdf ecological and biological importance area organic pollution trace metal pollution