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Atmospheric monitoring of organochlorine pesticides across some West African countries

  • 13th IHPA Forum and selected studies on POPs
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Abstract

Most African countries have ratified the Stockholm Convention on persistent organic pollutants (POPs) and are expected to reduce emissions of POPs such as organochlorine pesticides (OCPs) to the atmosphere. Emerging evidence, however, suggests that there are contemporary sources of OCPs in African countries despite the global ban on these products. This study investigated the atmospheric contamination from OCPs in four West African countries—Togo, Benin, Nigeria, and Cameroon—to ascertain the emission levels of OCPs and the characteristic signatures of contamination. Polyurethane foam (PUF) disk passive air samplers (PAS) were deployed in each country for ca. 55 days in 2012 and analyzed for 25 OCPs. Hexachlorocyclohexanes (HCHs) and DDTs constituted the highest burden of atmospheric OCPs in the target countries, at average concentrations of 441 pg m−3 (range 23–2718) and 403 pg m−3 (range 91–1880), respectively. Mirex had the lowest concentration, ranged between 0.1 and 3.3 pg m−3. The concentration of OCPs in rainy season was higher than in dry season in Cameroon, and presupposed inputs from agriculture during the rainy season. The concentrations of ∑25 OCPs in each country were in the following order: Cameroon > Nigeria > Benin > Togo. There was significant evidence, based on chemical signatures of the contamination that DDT, aldrin, chlordane, and endosulfan were recently applied at certain sites in the respective countries.

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Acknowledgments

We are very much grateful to all the people that helped us with air sampling in Togo, Benin, Nigeria, and Cameroon. This study was partly supported by the “Leadership Program in Sustainable Living with Environmental Risk” with the aid of the Strategic Funds for the Promotion of Science and Technology from the Ministry of Education, Culture, Sports, Science and Technology, Japan, and by internal research funds of Yokohama National University and the National Institute for Agro-Environmental Sciences.

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Correspondence to Jonathan N. Hogarh.

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Editorial Responsible: Constantini Samara

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Isogai, N., Hogarh, J.N., Seike, N. et al. Atmospheric monitoring of organochlorine pesticides across some West African countries. Environ Sci Pollut Res 25, 31828–31835 (2018). https://doi.org/10.1007/s11356-016-7284-y

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  • DOI: https://doi.org/10.1007/s11356-016-7284-y

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