Dispersion of plutonium from contaminated pond sediments

Rees, Terry F.; Cleveland, J.M.; Gottschall, W. Carl

doi:10.1021/es60145a004

Cited by 5 publications

(3 citation statements)

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“…The rocks were then used in desorption Kd experiments with synthetic groundwater (pH 8.2). The results (Table 5) indicated that 1) the Kd values are about the same as previously reported Kd values (Rees, Cleveland, Gottschall 1978;Wilhite 1978), and 2) the Kd values are similar for the three successive desorption intervals of one month. Valerce analysis showed that the plutonium in solution was Pu(IV).…”

Section: Table 4 Plutonium Concentrations In Varioussupporting

confidence: 85%

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Sorption of redox-sensitive elements: critical analysis

Strickert¹

1980

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The redox-sensitive elements (Tc, U, Np, Pu) discussed in this report are of interest to nuclear waste management due to their long-lived isotopes which have a potential radiotoxic effect on man. In their lower oxidation states these elements have been shown to be highly adsorbed by geologic materials occurring under reducing conditions. Experimental research conducted in recent years, especially through the Waste Isolation Safety Assessment Program (WISAP) and Waste/Rock Interaction Technology (WRIT) program, has provided extensive information on the mechanisms of retardation. In general, ion-exchange probably plays a minor role in the sorption behavior of cations of the above three actinide elements. Formation of anionic complexes of the oxidized states with common ligands (OH-, C0 3 ) is expected to reduce adsorption by ion exchange further. Pertechnetate also exhibits little ion-exchange sorption by geologic media. In the reduced (IV) state, all of the elements are highly charged and it appears that they form a very insoluble compound (oxide, hydroxide, etc.) or undergo coprecipitation or are incorporated into minerals. The exact nature of the insoluble compounds and the effect of temperature, pH, pe, other chemical species, and other parameters are currently being investigated.Oxidation states other than Tc(IV,VII), U(IV,VI), Np(IV,V), and Pu(IV,V) are probably not important for the geologic repository environment expected, but should be considered especially when extreme conditions exist (radiation, temperature, etc.).Various experimental techniques such as oxidation-state analysis of tracer-level isotopes, redox potential measurement and control, pH measurement, and solid phase identification have been used to categorize the behavior of the various valence states.

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Section: Table 4 Plutonium Concentrations In Varioussupporting

confidence: 85%

“…Extractions at different pH values were performed on Pu-contaminated sediments at Rocky Flats, Colorado (Rees, Cleveland, Gottschall 1978). It was shown that the Kd values decreased as the solution pH increased above 7.…”

Section: Table 4 Plutonium Concentrations In Variousmentioning

confidence: 99%

Sorption of redox-sensitive elements: critical analysis

Strickert¹

1980

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“…Other factors such as the oxidation state of plutonium (5) are probably also quite important in controlling the effective solubility of plutonium in natural waters. Laboratory experiments carried out with sediments from a pond contaminated with wastes from the Rocky Flats Plant in Colorado indicate increased mobility of plutonium at high pH, but the solution properties regulating the release were not established (6). On the basis of our data for Mono Lake and data from other studies, some of which are referred to above, it seems reasonable to suggest that plutonium can be substantially more mobile in natural waters than was generally accepted only a few years ago.…”

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confidence: 42%