Stripping voltammetric determination of trace levels of uranium by synergic adsorption

Mlakar, Marina; Branica, Marko

doi:10.1016/s0003-2670(00)81964-9

Cited by 67 publications

(24 citation statements)

References 10 publications

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“…Current uranium detection relies mainly on instrumental analysis methods, which are based on intrinsic physical properties of the element, such as atomic absorption (15), emission (16), phosphorescence (17,18), mass (19), or redox potential (20). Most instrumental analysis methods detect only total uranium with poor portability.…”

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confidence: 99%

A catalytic beacon sensor for uranium with parts-per-trillion sensitivity and millionfold selectivity

Liu

Brown

Meng

et al. 2007

Proc. Natl. Acad. Sci. U.S.A.

482

476

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Here, we report a catalytic beacon sensor for uranyl (UO 2 2؉ ) based on an in vitro-selected UO 2 2؉ -specific DNAzyme. The sensor consists of a DNA enzyme strand with a 3 quencher and a DNA substrate with a ribonucleotide adenosine (rA) in the middle and a fluorophore and a quencher at the 5 and 3 ends, respectively. The presence of UO 2 2؉ causes catalytic cleavage of the DNA substrate strand at the rA position and release of the fluorophore and thus dramatic increase of fluorescence intensity. The sensor has a detection limit of 11 parts per trillion (45 pM), a dynamic range up to 400 nM, and selectivity of >1-million-fold over other metal ions. The most interfering metal ion, Th(IV), interacts with the fluorescein fluorophore, causing slightly enhanced fluorescence intensity, with an apparent dissociation constant of Ϸ230 M. This sensor rivals the most sensitive analytical instruments for uranium detection, and its application in detecting uranium in contaminated soil samples is also demonstrated. This work shows that simple, cost-effective, and portable metal sensors can be obtained with similar sensitivity and selectivity as much more expensive and sophisticated analytical instruments. Such a sensor will play an important role in environmental remediation of radionuclides such as uranium.DNA ͉ DNAzyme ͉ fluorescence ͉ deoxyribozyme ͉ catalytic DNA

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mentioning

confidence: 99%

A catalytic beacon sensor for uranium with parts-per-trillion sensitivity and millionfold selectivity

Liu

Brown

Meng

et al. 2007

Proc. Natl. Acad. Sci. U.S.A.

482

476

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“…An alternative implying the formation of the mixed ligand complex between copper(II), SA and the HEPES buffer, as well as eventual synergetic adsorption [9][10][11][12] was taken into consideration. The resulting complex should be a neutral molecule.…”

Section: Mechanism Of the Cu(ii)-sa Redox Reactionmentioning

confidence: 99%

“…A so-called synergetic adsorption was achieved using mixed ligand systems such as 1,10-phenanthroline-tributylphosphate, as well as 2-thenoyltrifluoroacetone-tributylphosphate [9][10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Influence of the HEPES Buffer on Electrochemical Reaction of the Copper(II)-Salicylaldoxime Complex

1998

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The effect of the 4-(2-hydroxyethyl)-1-piperazineethanesulfonic acid (HEPES) on the redox process of copper(II)-salicylaldoxime complex [Cu(II)-SA] was studied. The measurements were performed on a hanging mercury drop electrode (HMDE) using various electrochemical techniques. The presence of the HEPES buffer (pH 8.0) doubled the reduction current of the Cu(II)-SA complex, whereas the reduction potential shifted to more positive values (about 50 mV). The results obtained indicate that the presence of the HEPES buffer facilitates the electron transfer between the mercury electrode and the adsorbed Cu(II)-SA complex during the reduction process. The experiments carried out using chronocoulometry with a double step potential revealed that the surface coverage of the Cu(II)-SA complex remained unchanged (in the range between 9 and 10.5 × 10 ¹11 mol cm ¹2 ), regardless of the presence of the HEPES buffer. Square-wave voltammetric measurements also indicate that the redox process of the Cu(II)-SA complex is electrochemically reversible with the reactant adsorption, in spite of the presence of the HEPES buffer.

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“…In view of this extraction and determination of U(VI) from surface and ground water has become a matter of great interest. 1,2 The literature citation revealed that there are various analytical techniques for the estimation of uranium which include thin layer chromatography, 3 gravimetry, 4 titrimetry, 5 fluorimetry, 6,7 potentiometry, 8 polarography, 9 X-ray fluorescence, 10 inductively coupled plasma mass spectrometry. 11 In addition, spectrophotometric methods have also been employed to determine U(VI) in presence of thorium(IV), 12 ore leachates, 13 natural waters, [14][15][16] process streams of a uranium extraction plant 17 and soil.…”

Section: Introductionmentioning

confidence: 99%

Spectrophotometric Determination of U(VI) with Rifampicin in Soil Samples

Lutfullah

Sharma

Rahmana

et al. 2011

J Chinese Chemical Soc

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A validated spectrophotometric method has been developed for the determination of uranyl ion in soil samples. The method is based on the complexation reaction between uranyl ion and rifampicin in methanol-water medium at room temperature. The method is followed spectrophotometrically by measuring the absorbance at 375 nm. Under the optimized experimental conditions, Beer's law is obeyed in the concentration range of 1.35-20.25 mg mL -1 with apparent molar absorptivity and Sandell's sensitivity of 8.0 × 10 3 L mol -1 cm -1 and 0.042 mg/cm 2 /0.001 absorbance unit, respectively. The interference of a large number of anions and cations has been investigated and the optimized conditions developed have been utilized for the determination of uranium(VI) in soil samples. The three sigma detection limit (n = 9) for uranyl ion was found to be 0.20 mg mL -1 . The proposed method was successfully applied to the determination of uranyl ion in soil samples.

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Stripping voltammetric determination of trace levels of uranium by synergic adsorption

Cited by 67 publications

References 10 publications

A catalytic beacon sensor for uranium with parts-per-trillion sensitivity and millionfold selectivity

A catalytic beacon sensor for uranium with parts-per-trillion sensitivity and millionfold selectivity

Influence of the HEPES Buffer on Electrochemical Reaction of the Copper(II)-Salicylaldoxime Complex

Spectrophotometric Determination of U(VI) with Rifampicin in Soil Samples

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