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A screening for microcontaminants performed by gas chromatography detected several microcontaminants in 12 sediment samples from the eutrophic estuary Guanabara Bay (GB) in southeastern Brazil. Bisphenol A (BPA) ranged from 1.4 to 20.3 ng g−1, 4-octylphenol, from <limit of detection (LD) to 0.9 ng g−1, 4-nonylphenol, from <LD to 3 ng g−1, gemfibrozil, from <LD to 1.4 ng g−1, naproxen, from <LD to 15.5 ng g−1m Ibuprofen, from <LD ng g−1 and diclofenac, from <LD to 0.9 ng g−1. Among estrogens, estrone, estradiol, ethinylestradiol and estriol were detected, ranging, respectively from <LD to 5.7 ng g−1, <LD to 18.1 ng g−1, <LD to 22.9 ng g−1 and <LD to 0.5 ng g−1. A strong and positive correlation between 4-nonylphenol and estrone and a moderate and positive correlation between bisphenol A and estradiol were noted. These findings demonstrating high levels of the detected microcontaminants in all analyzed samples, indicating chronic GB pollution.
•Estrogenic compound concentrations and distributions were assessed in Guanabara Bay.•Pharmaceutical correlations are associated with toxicological and environmental risks.•Beach shores contained higher micropollutant concentrations mainly hormones.