Abstract
The dissolution behavior of three simulated fission-produced noble metal alloy powders, i.e. Mo 0.40Ru 0.40Rh 0.10Pd 0.10 alloy with two particle sizes of 1.8 and 7.1 μm and Mo 0.20Ru 0.60Rh 0.10Pd 0.10 alloy with 3.8 μm particle size, was investigated from the time-dependence of the dissolution fraction of each component of the alloy in 3M boiling nitric acid solution. The dissolution of each component of the alloy obeyed a linear law. Although both the dissolution fraction and the dissolution rate of each component in the three alloys were different from each other, the dissolution rate constants of Ru, Rh and Pd except Mo in each alloy calculated using Jander's spherical sample model for the surface dissolution reaction were nearly the same. By comparing the present result with those reported previously, it is concluded that nearly equal dissolution rate constants were obtained for the alloys with the same (or similar) composition but the different particle size, showing the validity of the dissolution model. The total dissolution rate constants of the three MoRuRhPd alloy powders in 3M nitric acid solution determined in this study were about two orders of magnitude lower than those of MoRuRhPd alloy blocks in 7M nitric acid solution reported previously.
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