Etude dynamique des apports en éléments majeurs et nutritifs des eaux de la lagune de Porto-Novo (Sud Bénin)

Mama, Daouda; Chouti, Waris Kéwouyèmi; Alassane, A; Changotade, O; Alapini, F; Boukari, M.

doi:10.4314/ijbcs.v5i3.72279

Cited by 10 publications

(10 citation statements)

References 6 publications

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“…Maximum sulphates and magnesium levels in waters are recorded during long rainy season and short rainy season, respectively. This is not the case of Coatzacoalcas estuary in Mexico, lagoon of Porto-Novo and hydrosystem Lake Togo -Lagoon of Aného in Benin where Hoz et al (2003), Mama et al (2011) andOuro-Sama et al (2018), respectively, have reported high sulphates and magnesium levels in dry season or in période of oceanic influence. These high sulphates and magnesium levels during rainy seasons are due to anthropogenic factors (Assemian-Niango et al, 2014).…”

Section: Discussionmentioning

confidence: 95%

Seasonal variation of some major ions in a tropical lagoon waters, Aby lagoon (Côte d’Ivoire): Relationship with temperature, salinity and pH

Assemian-Niango¹,

Kpan²,

Aka³

2021

Int. J. Bio. Chem. Sci

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In response to continental inputs, the aim of this study was to know some major ions contents in Aby lagoon waters, according to seasons and in relation to temperature, salinity and pH. To do this, concentrations of major ions such as (sodium (Na +), potassium (K +), calcium (Ca2+), magnesium (Mg2+) and sulphates (SO42-) of Aby lagoon waters are determined, according to seasons and in relation to temperature, salinity and pH. From September 2007 to July 2009, during monthly sampling campaigns, temperature, salinity and pH of lagoon’s waters were measured, in situ, at twenty (20) stations distributed along lagoon. Water samples were taken at these stations, at the depth of 0.2 m below the surface, to determine in laboratory, concentrations of major ions using standard methods (Atomic Absorption Spectrometry methods for sodium, potassium, calcium and magnesium and Nephelometric method for sulphates). Seasonal variations of sodium, potassium and calcium concentrations are proportional to temperature, salinity and pH. These ions are under influence of oceanic waters inputs. In contrast, magnesium and sulphates are under anthropogenic influence, these concentrations are not proportional to temperature, salinity and pH. There are significant seasonal differences between major ions concentrations of waters from one season to another. Aby lagoon is under strong anthropogenic influence.

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Section: Discussionmentioning

confidence: 95%

Seasonal variation of some major ions in a tropical lagoon waters, Aby lagoon (Côte d’Ivoire): Relationship with temperature, salinity and pH

Assemian-Niango¹,

Kpan²,

Aka³

2021

Int. J. Bio. Chem. Sci

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“…INTRODUCTION L'étude de la qualité physicochimique et l'évaluation du niveau trophique des cours d'eau permet de caractériser ces éléments minéraux qui dégradent la qualité des cours d'eau et menacent la vie aquatique (Mama et al, 2011a). L'eutrophisation est un phénomène caractérisé par un déséquilibre écologique avec, au départ, une fertilisation excessive en éléments minéraux et organiques d'origine anthropique.…”

Section: Resumeunclassified

Évaluation de la qualité physico-chimique et du risque d’eutrophisation de la retenue d’eau de Kogbétohouè (Sud-Bénin)

Noumon¹,

Mama²,

Dedjiho³

et al. 2015

J. App. Bioscience.

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RESUMEObjectifs : Faire une caractérisation physico-chimique et une évaluation du risque d'eutrophisation suivant les variations du niveau des eaux de la retenue de Kogbétohouè Méthodologie et résultats : Les mesures directes de la qualité physique : le pH, la température et l'oxygène dissous ont été faits avec le multi paramètre PC HORIBA WATER QUALITY CHECKER U-10 ; la conductivité et les solides totaux dissous par le conductimètre WTW 340 i. Les eaux prélevées ont permis d'analyser la turbidité et les Matières en Suspension au colorimètre HACH/890 par la méthode 8025 ; les paramètres chimiques (NTK, NO -2, NO -3, NH4 + , PO4 3-ortho , PO4 3-total) par la méthode chromatographique ICS 1000 et de doser de la chlorophylle a avec le spectrophotomètre DR 5000 par la Norme AFNOR T90-117. Le risque d'eutrophisation est évalué par la grille de diagnostic d 'Ifremer (2000). Les paramètres indicateurs de la qualité physique de l'eau n'ont pas montré pas de grandes variations en périodes de hautes et basses eaux à l'exception de l'oxygène dissous où les valeurs sont très faibles en période de hautes eaux où le développement des plantes aquatiques est important. Les paramètres chimiques sont plus élevés en période de hautes eaux correspondante à une utilisation des engrais sur le bassin versant de la retenue. Les eaux sont dans un état eutrophe (basses eaux) et hypereutrophe (hautes eaux) traduisant une eutrophisation de la retenue. conductivity and total dissolved solids with conductivity meter WTW 340i. Water collected was analyzed for turbidity and MES by colorimeter HACH/890 with 8025 method; chemical parameters (NTK, NO -2, NO -3, NH4 + , PO4 3-ortho ,PO4 3-total) with chromatographic ICS 1000 method and chlorophyll a is measured out with spectrophotometer DR 5000 by AFNOR T90-117 Norm. Eutrophication risk of the dam is assessed with diagnostic gird of Ifremer (2000). The indicators of physical quality haven't shown a large variation in high or low water periods except dissolved oxygen which has lower values in high water period related to an important development of aquatic plants. Chemical parameters are more important in high water period when fertilizers are used to produce crops. Water analyses revealed that the eutrophication of the dam is great in high water period. Conclusion and applications of results: The eutrophication of the dam with a permanent risk of anoxia needs actions to reduce inputs of nitrogen and phosphorus in the dam. These results can help to settle integrated management plan of the dam and its basin.

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“…In addition to anthropogenic sources of nitrogen, the use of phosphorus in detergents and other chemicals increases the phosphate load in raw water. The metallurgical industry and the erosion of rocks can justify the presence of metals in these waters (Mama et al, 2011).…”

Section: Introductionmentioning

confidence: 99%

Comparative study of physicochemical parameters of wastewater discharged at the beaches of the Dakar Coast

Cisse¹,

Ndiaye²,

Ndiaye³

et al. 2020

Afr. J. Environ. Sci. Technol.

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The region of Dakar is characterized by a high population density often leading to a problem of development of the sewage network not equipped with a treatment station. The ejection of these raw untreated waters on the Dakar coast continually causes pollution of bays, seawater and threatens life in the aquatic environment and human health. The objective of this study is to assess the physicochemical quality of the wastewater discharged at the beaches of Hann, Mbao and Soumbédioune by the UV-visible spectrophotometry method. The physicochemical parameters show that the temperature varies between 21.7 and 34.8°C and the pH ranged from 6.73 to 7.93. Results are European standards for the water quality. However, the conductivity ranged from 1569 to 86500 (μS/cm) and exceeds the European standard. In addition, water results obtained show that the wastewater derived from the Dakar coast is rich in nitrites (2.3 mg/L) and phosphates (65 mg/L) which clearly exceed the standards established by the legislation, WHO (2017) reference guideline. Thus, it becomes important to establish sewage treatment plants in the study areas to improve the state of the coastal environment of the Dakar coast.

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Etude dynamique des apports en éléments majeurs et nutritifs des eaux de la lagune de Porto-Novo (Sud Bénin)

Cited by 10 publications

References 6 publications

Seasonal variation of some major ions in a tropical lagoon waters, Aby lagoon (Côte d’Ivoire): Relationship with temperature, salinity and pH

Seasonal variation of some major ions in a tropical lagoon waters, Aby lagoon (Côte d’Ivoire): Relationship with temperature, salinity and pH

Évaluation de la qualité physico-chimique et du risque d’eutrophisation de la retenue d’eau de Kogbétohouè (Sud-Bénin)

Comparative study of physicochemical parameters of wastewater discharged at the beaches of the Dakar Coast

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