The factors controlling the partitioning of polybrominated diphenyl ethers and polychlorinated biphenyls in the water-column of the Pearl River Estuary in South China

► Seasonal dependence for PBDEs and PCBs in the water of PRE was observed. ► POC plays an important role in determining the partition of both PBDEs and PCBs. ► Observed log KOC were lower for PBDEs but higher for PCB than predicted log KOC. ► A combination of sorption to colloids and adsorption to BC influences the partition.