Polychlorinated biphenyls (PCBs) in intertidal sediment and water from Lagos lagoon: Baseline report on occurrence, distribution and ecotoxicological risk assessment

•Distribution, sources and ecological risk assessment of PCBs are reported.•Low chlorinated PCBs dominated sediment homologue distributions.•Highly-chlorinated PCBs were dominant homologues in water.•Hexa-PCBs (PCB-138 and PCB-153) were the dominant congeners in most water samples.•Low total toxicity equivalent concentrations of dioxin-like sediment-associated PCBs are reported.