Abstract
SummaryColumn experiments were performed to study effects of humic acid on the mobility of63Ni(II) through crushed granite media. The63Ni concentration passing the column increased with increasing the concentration of humic acid. The migration behavior of63Ni, either retarded or non-retarded, could not be simulated by the widely-accepted, instantaneous equilibrium sorption model. The rate limited transformation model, taking into account non-equilibrium complexation of63Ni with humic acid facilitates the description of the observed migration behavior of63Ni.
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