Ranville et al. (2007) examined the association of uranium(VI) with dissolved organic matter from some pore water samples from a glacial till. Using flow field-flow fractionation, ICP-MS, and UV spectroscopy, they showed that only about 2% of the uranyl ions were bound to the dissolved organic matter.
Use Visual MINTEQ to calculate the speciation of uranyl in a solution representing the pore waters examined by Ranville et al. (2007). Use the groundwater chemical analyses for the 2.3 m depth in the oxidized till. Using a dissolved organic carbon concentration of 132 mg L-1 and a uranium concentration of 603 ppb. Assume that all of the uranium is present as U(VI), the uranyl ion (UO22+). The dissolved organic matter will be included in the model as the set of ligands described in Table 3.
Can you match the experimental results of
Ranville et al. (2007) -- that only about 2% of the uranium is bound to the
dissolved organic matter?
Last updated on May 22, 2007 by Joe Ryan