A synopsis of experimental data concerning the complexation of radionuclides with humic substance from various laboratories using different experimental methods reveals a consistent pattern of the metal concentration effect: With decreasing radionuclide concentration (and all other parameters held constant) an increase in the complexation of the radionuclide with humic substance is observed. The implications of this effect for model calibration and practical applications are discussed.
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Hummel et al. (1999) studied this question.