Speciation of Pu(VI) in Near-Neutral Solutions via Laser Photoacoustic Spectroscopy

Okajima, S.; Reed, Donald T.; Beitz, James V.; Sabau, C.S.; Bowers, D.L.

doi:10.1524/ract.1991.5253.1.111

Cited by 26 publications

(17 citation statements)

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“…We determined an average stability constant of log K = −5.39 ± 0.13 for the PuO 2 (OH) + complex. Our stability constant compares within the error interval to the data of Pashalidis et al [9] (log K = −5.68) and Okajima et al [10] (log K = −5.2) also determined spectroscopically, but is lower than other constants obtained by solubility experiments (log K = −5.52 [11]) or potentiometric titration (log K = −5.71 [12], log K = −5.97 [13]). The decrease of Pu(VI) aq and PuO 2 (OH) + in solution after adding increasing amounts of Pseudomonas stutzeri is shown in Fig.…”

Section: Influence Of the Hydrolysissupporting

confidence: 85%

Interaction of aerobic soil bacteria with plutonium(VI)

Panak¹,

Nitsche²

2001

Radiochimica Acta

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Plutonium / Bacillus sphaericus / Pseudomonas stutzeri / Biosorption / Absorption spectroscopy / ActinidesSummary. We studied the interaction of Pu(VI) with Pseudomonas stutzeri ATCC 17588 and Bacillus sphaericus ATCC 14577, representatives of the main aerobic groups of soil bacteria present in the upper soil layers. The biosorption studies have shown that these soil bacteria accumulate high amounts of Pu(VI). The relative sorption efficiency toward Pu(VI) related to the amount of biomass used decreased with increasing biomass concentration due to increased agglomeration of the bacteria resulting in a decrease of the number of available complexing groups. Spores of Bacillus sphaericus showed a higher biosorption than the vegetative cells at low biomass concentration which decreased significantly with increasing biomass concentration. At higher biomass concentrations (> 0.7 g/L), the vegetative cells of both strains and the spores of B. sphaericus showed comparable sorption efficiencies. Investigations on the pH dependency of the biosorption and extraction studies with 0.01 M EDTA solution have shown that the biosorption of plutonium is a reversible process and the plutonium is bound by surface complexation. Optical absorption spectroscopy showed that one third of the initially present Pu(VI) was reduced to Pu(V) after 24 hours. Kinetic studies and solvent extraction to separate different oxidation states of Pu after contact with the biomass provided further information on the yield and the kinetics of the bacteriamediated reduction. Long-term studies showed that also 16% of Pu(IV) was formed after one month. The slow kinetics of this process indicate that under our experimental conditions the Pu(IV) was not a produced by microbial reduction but seemed to be rather the result of the disproportionation of the formed Pu(V) or autoreduction of Pu(VI).

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Section: Influence Of the Hydrolysissupporting

confidence: 85%

Interaction of aerobic soil bacteria with plutonium(VI)

Panak¹,

Nitsche²

2001

Radiochimica Acta

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“…47 The sources of lead mobilized in response to CaNa2EDTA treatment are debated (from blood, hemopoietic tissue, extracellular space, spongy bone, bone, etc.). 40 .4 3 • 48 One study found that the standard CaNa2EDTA treatment has little impact on critical organs such as the brain and liver, and moreover EDTA may mobilize lead from bone and kidney and deliver it to the brain and liver. 48 Another criticism is that EDTA actually intensifies the inhibition exerted by lead on ALA dehydrase and other sulfhydryl-dependent enzymes.…”

Section: Lead(ll) Human Toxicity and Coordination Chemistrymentioning

confidence: 99%

“…There is precedence for multibridged lead-oxygen topology in lead oxides structures 40 , in adamanta-(J.14 -oxo-hexakis) J,L-triphenylsiloxy )-tetralead(II) 41 Extended structures in which ligand oxygen atoms bridge two more lead atoms range from long range interactions as seen in compound 3 and numerous other crystal structures 46 to dimers, tetramers, and chain-like structures. 47 There is very similar tetrameric structure containing five-coordinate dibridged lead atoms, a dithiocarbamate lead complex where the lead atoms are also monobridged to another lead atom.…”

Section: Experimental Synthesismentioning

confidence: 99%

“…Okajima, Reed, and coworkers, 40 in their determination of plutonyl hydrolysis constants using a 2.6 x 10-4M Pu022+ solution, reported absorbance bands centered at 622 nm and 632 nm when the pH was 4.6 and 4.9, which they identified as corresponding to the free ion and the hydrolysis product Pu020H+, respectively, and an unassigned band at 638 nm when the pH was 6.0.…”

Section: Plutonium(iv) Solubility and Speciationmentioning

confidence: 99%

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Coordination chemistry of two heavy metals: I, Ligand preferences in lead(II) complexation, toward the development of therapeutic agents for lead poisoning: II, Plutonium solubility and speciation relevant to the environment

Neu¹

1993

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“…[1][2][3][4][5][6][7] Laser induced photoacoustic spectroscopy ͑LI-PAS͒ presently seems to be the most frequently applied and advanced method, particularly in speciation and trace determination of rare earth and actinides in aqueous solutions. 8 The main reason why LIPAS is specially favored in analytical measurements over photothermal techniques simply lies in the very fast and easy alignment procedure, enabling sporadic use of the apparatus. But our recent experimental studies on the perfomance of the four just mentioned related techniques, have shown that photothermal techniques appear superior to PAS and conventional spectrophotometry in the determination of environmental pollutants.…”

Section: Introductionmentioning

confidence: 99%

Trace analysis of water pollutants by photothermal phase shift spectroscopy with an integrated optical microinterferometer

1996

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Photothermal phase shift spectroscopy measures the changes of the refractive index, induced by a modulated excitation light beam, by a double microinterferometer, consisting of a 7.5 ϫ 7.5 mm integrated optics silica chip. A laser diode that is integrated at the chip is used as the probe laser. The flowthrough cell containing the analyte is mounted in one of the two arms of the Michelson interferometer between the microchip and the reflecting mirror. The great potential of this photothermal microinterferometer as a routine method for process control or environmental surveillance lies in the miniaturization of the system for the following reasons. No adjustment is needed because only fixed components are used. The quality of the light beams is significantly improved by shortening the light paths and very small sample cell volumes in the range of nano-or microliters are needed. This has at least two distinct advantages. On the one hand, a small, compact analytical apparatus enables direct real time and on site measurements. On the other hand, it is possible to build a robust and reliable device, without any movable parts, that is unaffected by external influences. © 1996 Society of PhotoOptical Instrumentation Engineers.

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Speciation of Pu(VI) in Near-Neutral Solutions via Laser Photoacoustic Spectroscopy

Cited by 26 publications

References 0 publications

Interaction of aerobic soil bacteria with plutonium(VI)

Interaction of aerobic soil bacteria with plutonium(VI)

Coordination chemistry of two heavy metals: I, Ligand preferences in lead(II) complexation, toward the development of therapeutic agents for lead poisoning: II, Plutonium solubility and speciation relevant to the environment

Trace analysis of water pollutants by photothermal phase shift spectroscopy with an integrated optical microinterferometer

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