The Ouémé River is one of the most important rivers in the Republic of Bénin. River exceeded environmental quality standards and are reason for concern. In some areas, the concentrations of organochlorine pesticides in the sediment of the Ouémé New formulation to protect cotton, was also identified. The organophosphorous pesticide chlorpyrifos, used in a Hexachlorbutadiene, hexachlorobenzene and octachlorostyrene. Organochlorine pesticides identified in sediment samples included pp′-DDE, op′-DDD, pp′- DDD, op′-DDT, pp′-DDT, α-Įndosulfan, β-endosulfan, endosulfan sulphate, α-HCH, β-HCH, lindane, aldrin, dieldrin, endrin, telodrin, isodrin, cis- and transheptachlorepoxide, Except for one location, Tanéka-Koko, all areas were contaminated by more thanĢ0 pesticides. Locations along the Ouémé River from upstream to downstream. In this study, organochlorine and organophosphorous pesticide residues were measured in more than 35 sediment samples collected on nine
It is 510 km long and its catchment drains 75% of the country. Lack of any study on pesticides on sludge is largely because domestic wastewater is often not considered as a source of pesticide pollution, thus, studies focus more on river sediments exposed to agrochemicals. In Africa, 9 studies have reported PPCPs in sludge (Agunbiade and Moodley, 2016 Belhaj et al., 2016 Kimosop et al., 2016 Lehutso et al., 2017 Matongo et al., 2015a Oluwatosin et al., 2016 Schoeman et al., 2017) and river sediments (Agunbiade and Moodley, 2016 Kimosop et al., 2016 Matongo et al., 2015a Rimayi et al., 2018a), whereas there are 18 studies (Barakat et al., 2013 Dabrowski et al., 2002 Ezemonye et al., 2015 Gakuba et al., 2018 Hellar-Kihampa et al., 2011, 2013Ibigbami et al., 2015 Kilunga et al., 2017 Kuranchie-Mensah et al., 2012 Lalah et al., 2003 Muendo et al., 2012 Musa et al., 2011a Mwanamoki et al., 2014 Ntow, 2001 Ogbeide et al., 2015 Okoya et al., 2013 Otieno et al., 2013 Twesigye et al., 2011) dealing with pesticides in sediments.
Adsorbed compounds may persist in the environment and can be detected long after such compounds are out of use.
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