The root concentration factor (RCF) describes the capability of roots to accumulate contaminants from mangrove sediments and should be calculated using concentrations of the PAHs entering
root tissues (RCF was defined as the ratio of the PAHs concentrations insediments (Csediment) to thosein roots(Croot):
RCF¼ C sediment/C root). Higher values of RCF in dicated easier uptake
of accumulated contaminants by plant roots