Other
Scientific paper
Jul 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993gecoa..57.3367h&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 57, Issue 14, pp.3367-3381
Other
Scientific paper
The particle-solution ( K d ) relationships of Pu(III,IV) in the Esk Estuary are investigated, using new experimental data together with a synthesis of our earlier work. Adsorption of 236 Pu(IV) by a suspension of intertidal mud (40 mg L -1 ) from the Esk Estuary was determined after 1 h, as a function of salinity and pH, in a series of controlled laboratory experiments. Desorption of 239, 240 Pu(III,IV) from this environmentally contaminated sediment was determined concurrently. The short term (i.e., within a tidal cycle) non-conservative behaviour of Pu(III,IV) in both the laboratory experiments and the estuary appears to be dominated by a rapid, reversible surface complexation reaction, although only a small fraction (<5%) of the 239,240 Pu(III,IV) activity of the environmentally contaminated sediment is able to participate in the reaction. The existence of this exchangeable or labile fraction can explain the apparent dependence of Pu(III,IV) K d on sediment concentration. Thus, a single K d value is able to describe both the observed adsorption and desorption behaviour and the effect of sediment concentration, when desorption is expressed with respect to the labile 239,240 Pu(III,IV) fraction. For example, in R. Esk water, the adsorption of 236 Pu(III,IV) and the desorption of 236,240 Pu(III,IV), over a two order of magnitude concentration range of unwashed Esk Estuary sediment, can be accounted for by a single K d of ~3 × 10 3 L kg -1 . The K d for the labile Pu(III,IV) fraction varies mainly as a function of salinity. pH is not an important factor over the pH range 4-9, although H + ion exchange does occur, probably through a similar surface complexation reaction. The kinetic and equilibrium characteristics of the Pu (III,IV) sorption behaviour conform to the pattern observed by et al. (1988) and other workers for a range of trace elements.
Hamilton-Taylor John
Kelly Mike
Titley John G.
Turner David R.
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