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Distribution coefficients (K d ) were measured for cadmium (Cd) and nickel (Ni) in laboratory batch experiments for 18 sandy aquifer materials at environmentally relevant solute concentrations (Cd: 0.1-15 μg/l; Ni: 4-200 μg/l). The K d -values ranged three orders of magnitude: Cd: 2-1770 l/kg and Ni: 3-7250 l/kg. Correlating observed K d -values to characteristics of the...