Figure 3

Root concentration factor (RCF) of phenanthrene and pyrene for ryegrass uptake from aqueous solution. Root concentration factor (RCF) describes the capability of roots to accumulate contaminants from the direct contact with the aqueous environment, which is here defined as the ratio of PAH concentration in root (C_root) to that in culture medium (C_solution), i.e., RCF = C_root/C_solution.