Chemically selective polymer substrate based direct isotope dilution alpha spectrometry of Pu

Paul, Sumana; Pandey, Ashok K.; Shah, Raju V.; Aggarwal, Suresh K.

doi:10.1016/j.aca.2015.04.046

Cited by 21 publications

(20 citation statements)

References 35 publications

(43 reference statements)

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“…To make dual‐functional host, the host electrospun PES microfiber mat was grafted with poly(GMA) that could be used to link the reducing moiety such as hydrazine covalently with PES chains as shown in Scheme . The choice of PES was based on the fact that it undergoes photolysis under UV‐light irradiation to form free radicals and initiate graft‐polymerization of GMA as shown in Scheme . However, the grafting yield of poly(GMA) on the electrospun PES microfiber mat was found to be only 2–5 wt% that was not sufficient for higher extent of the hydrazine‐grafting required for higher reduction of Pd 2+ ions.…”

Section: Resultsmentioning

confidence: 99%

Dual-Functional Grafted Electrospun Polymer Microfiber Scaffold Hosted Palladium Nanoparticles for Catalyzing Redox Reactions

Chappa

Bharath

Oommen

et al. 2017

Macromol. Chem. Phys.

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Porous poly(ether sulfone) (PES) microfiber mat has been prepared by electrospinning technique using the optimized conditions. The reducing moiety has been attached covalently to the PES microfiber mat by UV‐graft polymerization of glycidylmethacrylate, and reacting subsequently with hydrazine via epoxy ring opening. The grafted polymer shell around porous microfiber has been found to perform the reduction of precursor ions by grafted hydrazine which leads to the nucleation and growth of Pd nanoparticles (NPs) on the host matrix itself. The catalytic activities and reduction kinetics of the microfiber hosted Pd NPs have been examined in the reductions of CrVI and UVI ions with in situ hydrogen generated by the formic acid decomposition at 50 °C, and p‐nitrophenol with borohydride/hydrazine at room temperature. Thus, hosted Pd NPs exhibit higher catalytic activity with respect to that reported in literature, and also the host matrix provides reasonably good recyclability and shelf‐life to Pd NPs.

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Section: Resultsmentioning

confidence: 99%

Dual-Functional Grafted Electrospun Polymer Microfiber Scaffold Hosted Palladium Nanoparticles for Catalyzing Redox Reactions

Chappa

Bharath

Oommen

et al. 2017

Macromol. Chem. Phys.

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“…28,29 Briey, the monomers (HEMP and EHM) were dissolved in 1 : 1 molar proportion of ethanol and water. 28,29 Briey, the monomers (HEMP and EHM) were dissolved in 1 : 1 molar proportion of ethanol and water.…”

Section: Preparation Of Pore-graed Sorbentsmentioning

confidence: 99%

“…28,29 To study the sorption of actinides in the present work, about 100 mg of pore-lled PES beads or 2 Â 1 cm 2 pieces of the extractant impregnated or pore-graed polymer sorbents were equilibrated with 5 mL of a wellstirred aqueous solution, spiked with mix Pu/ 233 U/ 241 Am and having various concentrations of HNO 3 for 2 h. The Pu solutions were treated with 30% H 2 O 2 in 3 mol L À1 HNO 3 prior to sorption, to keep the Pu oxidation state at IV. 28,29 To study the sorption of actinides in the present work, about 100 mg of pore-lled PES beads or 2 Â 1 cm 2 pieces of the extractant impregnated or pore-graed polymer sorbents were equilibrated with 5 mL of a wellstirred aqueous solution, spiked with mix Pu/ 233 U/ 241 Am and having various concentrations of HNO 3 for 2 h. The Pu solutions were treated with 30% H 2 O 2 in 3 mol L À1 HNO 3 prior to sorption, to keep the Pu oxidation state at IV.…”

Section: Sorption Of Actinidesmentioning

confidence: 99%

“…28,29 The EHM was used as the spacer to reduce the degree of cross-linking caused by the triester and diester functionality present in the HEMP monomer having more than one polymerizing double bonds, as shown in Fig. The extractants were anchored by UV-initiator induced gra polymerization in the pores of the host membranes and beads as described elsewhere.…”

Section: Formation Of Polymeric Sorbentsmentioning

confidence: 99%

“…29 The average concentrations of Pu(IV) from 3-5 measurements determined by the isotope dilution method in the dissolver solution are given in Table 3. Basically, the isotope dilution method is based on the addition of a known weight W sp of a pre-calibrated spike solution, having known concentration C sp , to a known weight W sa of the sample solution.…”

Section: Tehp : Hdehpmentioning

confidence: 99%

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Polymer based sorbent materials for thermal ionization mass spectrometric determination of uranium(vi) and plutonium(iv) ions

Paul

Pandey

Shah

et al. 2016

J. Anal. At. Spectrom.

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Thermal ionization mass spectrometry (TIMS) is a widely used method for obtaining information about the isotopic composition of individual isotopes with high resolution and accurate quantification with considerably low detection limits. However, analyses by TIMS require an elaborate sample preparation step to eliminate the matrix and subsequent manual loading of small volumes of purified aqueous samples on a filament surface for thermal ionization. This is cumbersome, particularly for the handling of radioactive solutions. Therefore, in the present work, polymeric material based sorbents were explored for the single step matrix elimination and source preparation for the loading of U(VI) and Pu(IV) ions preconcentrated from a variety of environmental and nuclear fuel reprocessing samples. The solid phase loading offers a number of advantages for handling radioactive materials, and is amenable to matrix elimination and preconcentration of analytes that would further improve the detection limit of TIMS. The polymer based sorbents were prepared by anchoring neutral and acidic phosphate functional groups selective to actinide ions in porous poly(propylene) and poly(ethersulfone) matrices. One of the procedures used for the preparation of polymeric sorbents involved grafting of the monomers phosphoric acid 2-hydroxyethyl methacrylate ester and 2-ethylhexylmethacrylate (EHM) in 1 : 1 molar proportion by UV-initiator induced polymerization in the pores of the host matrix. In another route, the liquid extractants tris(2-ethylhexyl) phosphate (TEHP) along with bis(2-ethylhexyl) phosphoric acid (HDEHP), in different molar proportions, were physically immobilized by capillary force in the pores of poly(propylene) and poly(ethersulfone) membranes and beads. It was observed that the poly(propylene) pyrolyzed easily at a filament temperature close to that used for solution based sample loading, and thus was best suited for the analyses of U(VI) and Pu(IV) by TIMS. The composition of the polymer membrane supported liquid extractant based sorbents was optimized for the preconcentration of U(VI) from ground water and seawater, and also for the preconcentration of Pu(IV) from 3 mol L À1 HNO 3 , which is normally encountered in nuclear fuel reprocessing facilities. The parameters affecting the analytical performance of polymer sorbent based TIMS were evaluated, and tested for the quantification of U and Pu in the ppb concentration range in seawater and urine samples using the isotope dilution method. Sample Pu(IV) conc. (ppm) PolymSorb-TIMS Solution-TIMS Avg. RSD (%) Avg. RSD (%) Dissolver solution 12.90 AE 0.07 0.51 13.05 AE 0.04 0.30This journal is

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Actinides selective extractants coated magnetite nanoparticles for analytical applications

Ojha

Chappa

Mhatre

et al. 2017

J Radioanal Nucl Chem

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Chemically selective polymer substrate based direct isotope dilution alpha spectrometry of Pu

Cited by 21 publications

References 35 publications

Dual-Functional Grafted Electrospun Polymer Microfiber Scaffold Hosted Palladium Nanoparticles for Catalyzing Redox Reactions

Dual-Functional Grafted Electrospun Polymer Microfiber Scaffold Hosted Palladium Nanoparticles for Catalyzing Redox Reactions

Polymer based sorbent materials for thermal ionization mass spectrometric determination of uranium(vi) and plutonium(iv) ions

Actinides selective extractants coated magnetite nanoparticles for analytical applications

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