Monitoring of organic micropollutants in Ghana by combination of pellet watch with sediment analysis: E-waste as a source of PCBs |
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| Institution: | 1. Institute of Nutrition and Food Safety, Guangdong Provincial Center for Disease Control and Prevention, Guangzhou 511430, PR China;2. School of Public Health, Southern Medical University, Guangzhou 510515, PR China;3. Guangzhou Punuo Environmental Testing and Technology Service Co. Ltd., Guangzhou 510530, PR China;4. National Testing Center for Food Quality Supervision (Guangdong), Guangdong Testing Institute of Product Quality Supervision, Foshan 528300, PR China |
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| Abstract: | Plastic resin pellets collected at 11 beaches covering the whole Ghanaian coastline were analyzed for polychlorinated biphenyls (PCBs). PCB concentrations (∑13 congeners) were higher in Accra, capital city, and Tema (39–69 ng/g-pellets) than those in rural coastal towns (1–15 ng/g-pellets) which are close to global background, indicating local inputs of PCBs. River sediments were also analyzed for PCBs together with molecular markers. Sedimentary PCBs concentrations were highest at a site (AR02) downstream of an electronic waste (e-waste) scrapyard. At the site (AR02), concentration of linear alkylbenzenes (LABs), a marker of municipal wastewater, was lower than another site (AR03) which is located at the downstream of downtown Accra. This result suggests that PCBs are introduced more to the river from the e-waste site than from activities in downtown Accra. PAHs concentrations were relatively higher in urban areas with strong petrogenic signature. Abundance of triphenylbenzenes suggested plastic combustion near e-waste scrapyard. |
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| Keywords: | PCBs Pellet watch Electronic waste Molecular markers Triphenylbenzene Linear alkylbenzenes |
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