Selective Determination of Cr(VI) by a Self-Assembled Monolayer-Based Electrode

Turyan, Iva; Mandler, Daniel

doi:10.1021/ac9607525

Cited by 235 publications

(166 citation statements)

References 33 publications

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“…Two types of working electrodes were employed. Glassy carbon electrodes (GC, 3 mm diameter, Atomergic Chemetals, Farmingdale, NY) were constructed and polished prior to film deposition following a previously described procedure [44]. Indium-tin-oxide (ITO) plates (area 0.7 cm À 2 , surface conductivity; < 10 W/Square), Delta Technologies, Stillwater, MN) were washed with pure water, ethanol and finally dried at room temperature for 1 ± 2 h before use.…”

Section: Instrumentsmentioning

confidence: 99%

Application of Sol‐Gel Technology for Electroanalytical Sensing

et al. 2003

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The applicability of thin sol-gel films as selective interfaces in electrochemical sensors has been examined. This requires not only to create a selective interface but also to enable facile diffusion of the analytes across the films. Creation of selectivity has been aimed by molecularly imprinting an electroactive species in the course of sol-gel formation. We have focused primarily on imprinting an iron(II) complex, i.e., tris(2,2'-bipyridine)iron(II) (Fe(bpy) 2 3 , as a means of selectively determining iron(II) in aqueous solution. Hence, the effect of different parameters, such as the composition of the sol-gel film and the hydrolysis and drying time, on the diffusion of Fe(bpy) 2 3 , has been studied. We find that diffusion can be remarkably enhanced upon adding polyethylene glycol or a surfactant, such as decanoic acid. Nevertheless, so far we have not been able to develop thin films, which exhibit selectivity towards this inorganic species. The difficulties in designing such selective interfaces for heavy metals as opposed to organic species is demonstrated by successfully applying the same approach for designing a selective interface for diethyl-p-nitrophenyl phosphate (paraoxon).

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Section: Instrumentsmentioning

confidence: 99%

Application of Sol‐Gel Technology for Electroanalytical Sensing

et al. 2003

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“…For example, Rubinstein and coworkers [7~9] demonstrated that mixed functionalized SAMs could recognize copper ions selectively in the presence of other ions. Mandler and co-workers [10,11] have reported a highly sensitive electrode for cadmium ions and chromium(VI) ions using self-assembled monolayers-based electrodes. S.Berchmans et al [12] studied the formation of nickel hydroxide monolayers on Au through a SAMs, J.Y.Mo [13] presented a method for the determination of dopamine and epinephrine by SAMs.…”

Section: Introductionmentioning

confidence: 99%

Studies on the Electrochemical Behaviour of Hydroquinone at L-cysteine Self-Assembled Monolayers Modified Gold Electrode

Wang

2002

Sensors

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L-Cysteine is combined onto gold electrode to form a self-assembled monolayers modified electrode (L-Cys/Au SAMs) by taking advantage of strong sulfur-gold interaction. ATR-FTIR, SEM, cyclic voltammetry (CV) and impedance were used for the characterization of the film. It shows excellent stability upon voltametric scanning and a good voltametric response towards hydroquinone with the potential ranged from 0.8 to -0.2 V (vs.SCE) in 0.5M HAc-NaAc buffer solution (pH 4.8). The oxidation potential of hydroquinone on the modified electrode shifted negatively about 330 mV as compared with the bare gold electrode. The plot of catalytic current vs.its concentration has a good linear relation in the range of 2.0×10 -6~2.0×10-4 M with the correlation coefficient of 0.9986 and the detection limit of 4.0×10 -7 M by different pulse voltammetry (DPV). Mechanism for the electrocatalytical process has been studied.

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“…The analytical methods commonly used for the determination of Cr(VI) are atomic absorption spectrometry (AAS) [9], fluorescence spectrometry [10], and electrochemical measurements [11]. If these analytical methods are combined with the microextraction of pine needle powder for the determination of Cr(VI), the sensitivity and selectivity must be increased, and the detection of limit must be decreased.…”

Section: Introductionmentioning

confidence: 99%

Solid phase microextraction and determination of dichromate in aqueous solution based on pine needle powder-modified carbon paste electrode by potentiometry

et al. 2013

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Pine needle is a low-cost natural biopolymer, and Cr 2 O 7 2-is a poisonous anions in the environment. In the present paper, pine needle powder was used as a solid phase microextractant in the modification of carbon paste electrode for extraction and determination of Cr 2 O 7 2-anions. The extraction process was monitored by an open circuit potential method, and an apparent first-order rate constant of 0.06474 s -1 was obtained from a Richard model. The extraction isothermal curve follows a logarithm adsorption model with a adsorption equilibrium constant of 5.95. Under the optimal conditions, the concentration of K 2 Cr 2 O 7 in river water of Shenyang Normal University campus was determined by the potentiometric method in the concentration range of 1.0 9 10 -6 -1.0 9 10 -2 M with a detection limit of 1.0 9 10 -7 M (the signal to noise Ratio was 3:1), relative standard deviation of 3.44 %, and standard addition recovery in the range of 94.70-103.5 %. The large amounts of common existing ions such as Cr 3? , Cu 2? , and SO 4 2-showed no interference with the molar ratio up to 100:1, but CrO 4 2-, Pb 2? ions showed a great interference in the detection of Cr 2 O 7 2-due to the transformation from CrO 4 2-to Cr 2 O 7 2-and precipitations of PbCrO 4 and PbCr 2 O 7 , respectively.

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Selective Determination of Cr(VI) by a Self-Assembled Monolayer-Based Electrode

Cited by 235 publications

References 33 publications

Application of Sol‐Gel Technology for Electroanalytical Sensing

Application of Sol‐Gel Technology for Electroanalytical Sensing

Studies on the Electrochemical Behaviour of Hydroquinone at L-cysteine Self-Assembled Monolayers Modified Gold Electrode

Solid phase microextraction and determination of dichromate in aqueous solution based on pine needle powder-modified carbon paste electrode by potentiometry

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