Polychlorinated biphenyls (PCBs) are one class of persistent organic pollutants defined in the Stockholm Convention.PCBs can cause harmful biological effects,such as toxicity, mutagenicity, carcinogenicity, and endocrine disrupter activity.PCBs can bio-accumulate in fatty tissues through food chains, so even small exposures eventually reach dangerous levels.Therefore, urgent actions have been called to dispose PCBs globally.