Fig. 4. Cadmium concentrations (mg kg^-1 dry wt.) in the new leaves, old leaves, and roots of lettuce exposed to a range of free Cd concentrations in the flow-through hydroponic (FTH) system. Error bars represent the standard error of the mean and are shown only when the sample size is 3 (number of replicates x = 3, except x = 2 for control and pCd = 9.6 roots and x = 1 for pCd = 9.6 new leaves and old leaves). Average values (mg kg^-1 dry wt.) for control and pCd = 9.6 roots, new leaves, and old leaves, respectively, are 4.9, 7.1, and 0.9 (control) and 0.8, 4.4, and 3.1 (pCd = 9.6).

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