Isolation of Plutonium Physical--Chemical States from Natural Waters.

摘要

The purpose of this research program was to evaluate the feasibility,on a bench scale,of methods for preconcentrating selectively individual plutonium forms from very dilute natural water samples,and to apply these results to use with the Battelle large volume water sampler. From the results of the current investigations,several alternative water sampling strategies have been recommended. The preferred water sampling technique has been field tested at several groundwater wells in the 200East and 200West areas of the U.S. Department of Energy Hanford Reservation. These laboratory investigations,in combination with field testing of the proposed water sampling techniques,have yielded the following conclusions: (1) The use of polypropylene microporous filters (0.04mu pore size) in conjunction with glass fiber filters (3.0mu pore size) enables the characterization of two size fractions of particulate plutonium forms in groundwater samples. Those species which pass the microporous polypropylene filters are considered to be in solution. (2) The sorption and ion exchange media evaluated do not show the selectivity necessary to allow preconcentration of individual plutonium forms from natural water samples by any of these media beds under the conditions evaluated. (3) Al sub 2 O sub 3is the most effective sorption media that was examined for removing any plutonium species from natural water samples at neutral pH values. On the basis of these investigations, a standard field testing methodology has been proposed for sampling ground waters near nuclear waste management areas. Additional laboratory evaluations of plutonium species interactions with sorption and ion exchange media have also been recommended. (ERA citation 04:019880)