is offset by a 5-fold higher concentration
of H+, where binding affinity (log K) is comparable. For
C. demersum, the cell surface binding affinity of U (log K=6.25 at
20 mg CaCO3 L−1 hardness) was ~6-fold lower than that of Cu (log
K=7.0 at 35 mg CaCO3 L−1 hardness;