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High levels of toxic compounds found on coasts of West Africa
Date:4/6/2011

"We were not expecting to find such high levels of PCBs, highly toxic compounds that are considered as priority compounds by European legislation, in a region such as the western coast of Africa", Ailette Prieto, a researcher at the University of the Basque Country (UPV/EHU-Spain) and co-author of a study published in the journal Environmental Science & Technology, tells SINC.

PCBs, which some studies have shown to be carcinogenic compounds, were used years ago as dielectric fluids in transformers, condensers and coolants for various devices. However, their production was banned in the United States in 1979 due to their toxicity and persistence in the environment, and they were banned from 2001 onwards in countries such as Spain that signed up to the Stockholm Convention on Persistent Organic Compounds.

Now, the team led by researcher Rosalinda Gioia at Lancaster University (United Kingdom), has shown that high concentrations of PCBs (between 10 and 360 picograms/m3) are found in some countries in West Africa, such as the Gambia and Ivory Coast, and all along this coast.

For this study, the scientists have carried out several years of research campaigns throughout the region over recent years, taking air samples from the German ship RV Polastern. They also gathered samples from land-based stations (Gambia, Sierra Leone, Ivory Coast and Ghana), and used particle dispersion models to seek the possible sources of the contamination.

Illegal dumping and ship graveyards

Gioia explains that the high levels of PCBs could come from more than one potential source "the illegal dumping of waste containing these compounds they can be released through volatilisation and uncontrolled burning as well as the storage and scrapping of old ships". The study points particularly to the large ships' graveyard in the bay of Nuadib (Mauritania), which is one of the largest in the world.

"Another possible source cou
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Contact: SINC
info@plataformasinc.es
34-914-251-820
FECYT - Spanish Foundation for Science and Technology
Source:Eurekalert  

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