Preparation of solutions of tracer level plutonium(V)

Saito, A.; Roberts, R.A.; Choppin, G.R.

doi:10.1021/ac00279a096

Cited by 17 publications

(12 citation statements)

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“…Oxidation state determination based on [15] was conducted in duplicate on the tracer, which was found to be 80%-100% in the IV valent state. Pu(V) was made from a dilution of this tracer following the procedure of [16] with a few modifications. 1) unpurified TTA was used and 2) the back extraction was conducted immediately with no setting time for photoreduction.…”

Section: Sorption Studiesmentioning

confidence: 99%

Pu(V) reduction and enhancement of particle-water partitioning by exopolymeric substances

Roberts¹,

Santschi

Honeyman

2008

Radiochimica Acta

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Central to understanding the environmental behavior of Pu in vadose- and saturated-zones, as well as waste streams, is the contribution of colloidal natural organic mater (NOM), e.g. , biopolymeric exopolymeric substances (EPS) from Pseudomonas fluorescens Biovar II and geopolymeric humic acids (HA), to Pu speciation. Because Pu(V) and Pu(IV) are present in aquatic systems at sub-pM concentrations, many established techniques for chemical speciation and oxidation state determination are not available. However, the two redox states of Pu can be distinguished through their tendency to form colloidal species. Controlled laboratory experiments with low-colloid background solutions of 0.1 M NaClO4 with an inert buffer (Tris) and 5 μm silica particles of high specific surface area (500 m2/g) and small (3 nm) pores investigated the ability of NOM compounds for their binding and redox qualities showed that: 1) Pu(V) and Pu(IV) tracers at pM concentrations could be distinguished by their tendency to bind to colloidal species (≥1 kDa), with binding extent being high for Pu(IV), and low for Pu(V); 2) EPS can significantly enhance particle- (or colloid-) water partition coefficients to silica particles (K d, K dc), quickly (1 day) for Pu(IV) and slowly (1 month) for Pu(V); 3) Pu(V), in the presence of EPS and silica particles can become associated with particles and colloids over periods of months, likely indicating reduction; 4) K d values can be affected by the reaction sequence of tracer addition to the solution containing silica particles and NOM compounds ( e.g. , EPS or HA).

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Section: Sorption Studiesmentioning

confidence: 99%

Pu(V) reduction and enhancement of particle-water partitioning by exopolymeric substances

Roberts¹,

Santschi

Honeyman

2008

Radiochimica Acta

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“…10 −10 M). Pu(V) was prepared following the method described in reference [5]. Plutonium was determined by liquid scintillation counting, using a Beckman Model 6500 counter and Ecolume scintillation cocktail.…”

Section: Experimental Materialsmentioning

confidence: 99%

Reduction of Pu(V) by humic acid

André¹,

Choppin²

2000

Radiochimica Acta

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“…For the batch experiments which have been performed, plutonium was prepared as the 238 PuO 2 + species following the method of Saito et al 1985. This involved the production of Pu(VI) by oxidation with KMnO 4 , and subsequent photolytic reduction to Pu (V) in a thenoyltrifluoracetone solution. Pu (V) produced in this way was back extracted into a saline aqueous phase at pH 4.5 and was then added to the NaCl solutionto give a final solution concentration of 10-l' M plutonium.…”

Section: Methodsmentioning

confidence: 99%

Chemical speciation of strontium, americium, and curium in high level waste: Predictive modeling of phase partitioning during tank processing. Annual progress report, October 1996--September 1997

Felmy¹,

Choppin²

1997

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Preparation of solutions of tracer level plutonium(V)

Cited by 17 publications

References 0 publications

Pu(V) reduction and enhancement of particle-water partitioning by exopolymeric substances

Pu(V) reduction and enhancement of particle-water partitioning by exopolymeric substances

Reduction of Pu(V) by humic acid

Chemical speciation of strontium, americium, and curium in high level waste: Predictive modeling of phase partitioning during tank processing. Annual progress report, October 1996--September 1997

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