Relationships between PAHs and PCBs, and quantitative source apportionment of PAHs toxicity in sediments from Fenhe reservoir and watershed

► PAHs and PCBs in 28 sediment samples were measured. ► TEQ and SQG-Q were used to assess toxicity of C-PAHs and DL-PCBs. ► Relationships among ∑PAHs, ∑PCBs, C-PAHs, DL-PCBs and industrial sources of PAHs were analyzed. ► Sources of PAHs concentrations and TEQ were apportioned quantitatively.