Polycyclic aromatic hydrocarbons (PAHs) are one class of persistent organic pollutants,widely distributed in the environment.PAHs are considered hazardous because of their cytotoxic,mutagenic,and carcinogenic effects.The fates of these compounds in the environment and the remediation of PAH-contaminated sites are,therefore,of high public interest.Mangrove ecosystems,which are important inter-tidal estuarine wetlands along the coastlines of tropical and subtropical regions,are exposed to anthropogenic contamination by PAHs from tidal water,river water and land-based sources.