Abstract
The Alibori Basin, with an area of 13,400 km2, is a tributary of the Niger River in Benin. It is a river that passes through the potentially agricultural area of Benin. The waters of the river are useful for wildlife and are used for various purposes (drinking water, laundry, domestic activities). They regularly receive the discharges and drainage of the residues of the chemical fertilizers and pesticides not used by crops during the cultivation of the river and watershed bank. This study aims to assess the impact of the agricultural inputs on the quality of the waters from Alibori river on the basis of its physico-chemical characteristics and concentrations in Trace Metal Elements such as Zn, Pb, Cd and Cu. Seven (7) sites were selected along the river. Concentrations of , , , PO3-4, Cu and Zn were measured using a Spectrophotometer DR 2800 and that of Pb and Cd by Metalyse. The Metal Trace Elements were measured in the Alibori river sediments after being treated and mineralized using aqua regia. The results revealed that Alibori river characteristics varied with seasons and its waters and sediments were polluted by metals, phosphates and nitrites. The pollution of waters of the Alibori River was due to the intensive use of the chemical fertilizers and pesticides for agricultural purposes.
Highlights
Water is the most consumed food; it is a vital element for the human being
The waters of the river are useful for wildlife and are used for various purposes. They regularly receive the discharges and drainage of the residues of the chemical fertilizers and pesticides not used by crops during the cultivation of the river and watershed bank
The results revealed that Alibori river characteristics varied with seasons and its waters and sediments were polluted by metals, phosphates and nitrites
Summary
Water is the most consumed food; it is a vital element for the human being It is necessary for health, agriculture, industry, tourism, leisure and navigation. Having water in both quality and quantity is important to ensure a safe and healthy life in the long term [1]. Around 3 millions of people live directly and indirectly on cotton production in Benin [4]. It contributed to the earnings from official export for about 70% in Benin and to the GDP for about 20% in 2017 in Benin according to European Union Speech of September 2018
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