Thin extractive membrane for monitoring actinides in aqueous streams

Chavan, Vivek; Paul, Sumana; Pandey, Ashok K.; Kalsi, P. C.; Goswami, Anjana

doi:10.1016/j.jhazmat.2013.05.007

Cited by 18 publications

(11 citation statements)

References 24 publications

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“…The details of α radiography are given in our earlier publication. 10 Sorption and Desorption Studies. To study the extraction properties of the polymers, about 100 mg of the polymer sample was equilibrated with 5 mL of well-stirred solution containing a tracer level concentration of Pu/Am.…”

Section: ■ Experimental Sectionmentioning

confidence: 99%

Tailored Bifunctional Polymer for Plutonium Monitoring

et al. 2014

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Monitoring of actinides with sophisticated conventional methods is affected by matrix interferences, spectral interferences, isobaric interferences, polyatomic interferences, and abundance sensitivity problems. To circumvent these limitations, a self-supported disk and membrane-supported bifunctional polymer were tailored in the present work for acidity-dependent selectivity toward Pu(IV). The bifunctional polymer was found to be better than the polymer containing either a phosphate group or a sulfonic acid group in terms of (i) higher Pu(IV) sorption efficiency at 3-4 mol L(-1) HNO3, (ii) selective preconcentration of Pu(IV) in the presence of a trivalent actinide such as Am(III), and (iii) preferential sorption of Pu(IV) in the presence of a large excess of U(VI). The bifunctional polymer was formed as a self-supported matrix by bulk polymerization and also as a 1-2 μm thin layer anchored on a microporous poly(ether sulfone) by surface grafting. The proportions of sulfonic acid and phosphate groups in both the self-supported disk and membrane-supported bifunctional polymer were found to be the same as expected from the mole proportions of monomers in polymerizing solutions used for syntheses. α radiography by a solid-state nuclear track detector indicated fairly homogeneous anchoring of the bifunctional polymer on the surface of the membrane. Pu(IV) preconcentrated on a single bifunctional bead was used for determination of the Pu isotopic composition by thermal ionization mass spectrometry. The membrane-supported bifunctional polymer was used for preconcentration and subsequent quantification of Pu(IV) by α spectrometry using the absolute efficiency at a fixed counting geometry. The analytical performance of the membrane-supported-bifunctional-polymer-based α spectrometry method was found to be highly reproducible for assay of Pu(IV) in a variety of complex samples.

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Section: ■ Experimental Sectionmentioning

confidence: 99%

Tailored Bifunctional Polymer for Plutonium Monitoring

et al. 2014

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“…A variety of receiving solutions such as biological cultures and alkaline solutions can be employed to strip the permeated organics, maintaining the organic concentration driving force imperative for mass transfer across the membrane [11]. Therefore, to a large extent, the aqueous-aqueous extraction efficiency is determined by the mass-transfer capacity of the membrane phase [12]. The ideal characteristics of the dense membrane used for the aqueous-aqueous membrane extractive process should comprise three aspects: (1) high organophilicity to effectively extract the target organics from the aqueous feed; (2) strong hydrophobicity to completely reject water and inorganic components; and (3) low resistance to ensure efficient organic passage.…”

Section: Introductionmentioning

confidence: 99%

Development of highly-efficient ZIF-8@PDMS/PVDF nanofibrous composite membrane for phenol removal in aqueous-aqueous membrane extractive process

Jin

Lin

Liao

et al. 2018

Journal of Membrane Science

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“…Seawater was collected from Juhu Beach, Mumbai, and groundwater was collected from West Bengal, India. A synthetic urine sample was prepared as per the literature . Known amounts of Pu were added to 100 mL of seawater, groundwater, and synthetic urine samples; the acidity of these samples was adjusted to 3 M HNO 3 , the samples were treated with 30% H 2 O 2 , Pu concentrations in these aqueous samples were determined by the SLM-TIMS method, employing the isotope dilution technique, and the results were compared with the conventional solution based TIMS (ID-TIMS) method.…”

Section: Methodsmentioning

confidence: 99%

“…A synthetic urine sample was prepared as per the literature. 35 Known amounts of Pu were added to 100 mL of seawater, groundwater, and synthetic urine samples; the acidity of these samples was adjusted to 3 M HNO 3 , the samples were treated with 30% H 2 O 2 , Pu concentrations in these aqueous samples were determined by the SLM-TIMS method, employing the isotope dilution technique, and the results were compared with the conventional solution based TIMS (ID-TIMS) method. The principle of isotope dilution technique and choice of spike are discussed in detail in the Supporting Information (S.I.…”

Section: ■ Experimental Sectionmentioning

confidence: 99%

Task-Specific Supported Liquid Membrane for Actinide Assay in Aqueous Streams by Thermal Ionization Mass Spectrometry

2019

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Thermal ionization mass spectrometry is the most commonly used technique for the determination of Pu isotopic composition and concentration in complex matrices but involves multiple steps including sample pretreatment, removal of matrix, preconcentration of Pu, and loading on a rhenium filament for TIMS analysis. The present work reports the synthesis of the N,N′-dioctyl-α-hydroxyacetamide (DOHA) functionalized supported liquid membrane that offered dual functions: (i) matrix elimination and/or preconcentration of actinides from complex aqueous samples and (ii) served as a loading substrate for TIMS analysis. The ligand composition in the membrane can be tuned aiming either for selective preconcentration of Pu from an aqueous matrix or for bulk removal of actinides. The membrane, impregnated with 0.2 M DOHA in dodecane, showed very high selectivity for PuIV in acidic medium, in the presence of other competing actinides, viz., AmIII, UVI, and NpV. The membrane based loading in TIMS improved the sample utilization efficiency and ionization efficiency compared to the conventional solution loading technique, offering Pu analysis from a single Re filament, that served as both vaporization and ionization filament and direct determination of 238Pu in the presence of 238U, eliminating the requirement of alpha spectrometry. It was possible to achieve >80% reduction in analysis time and >95% reduction in secondary waste generation by the SLM-TIMS method, compared to conventional TIMS involving Pu purification by anion exchange resin. Pu concentrations in seawater and groundwater samples, synthetic urine, and dissolver solution of irradiated fuel were determined by SLM-TIMS, employing the isotope dilution (ID) technique, with very good accuracy and precision. The membrane, impregnated with 2 M DOHA in dodecane, showed strong affinity for actinides and was successfully employed for the removal of bulk actinides from aqueous samples with more than 96% recovery.

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Thin extractive membrane for monitoring actinides in aqueous streams

Cited by 18 publications

References 24 publications

Tailored Bifunctional Polymer for Plutonium Monitoring

Tailored Bifunctional Polymer for Plutonium Monitoring

Development of highly-efficient ZIF-8@PDMS/PVDF nanofibrous composite membrane for phenol removal in aqueous-aqueous membrane extractive process

Task-Specific Supported Liquid Membrane for Actinide Assay in Aqueous Streams by Thermal Ionization Mass Spectrometry

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