The bioavailability of PAHs in aged mangrove sediment after phytoremediation was considerably lower than in the NA/NF and flooded sediment. Additionally, flooding decreased the bioavailability of PAHs
(104.18 mg/kg for Nap,48.48 mg/kg for Ant and17.30 mg/kg for B[a]P)
relative to theNA/NF condition.The concentrations of bioavailable
PAHs in the mangrove sediment after phytoremediation were ordered
as follows:NA/NF4 flooded 4 aged.The immobilized,bound fractions
of the PAHs ,which are represented by DCM extractable fractions