Development of a voltammetric sensor for chromium(VI) determination in wastewater sample

Bergamini, Márcio F.; Santos, Daniela Pereira dos; Zanoni, María Valnice Boldrin

doi:10.1016/j.snb.2006.10.062

Cited by 76 publications

(32 citation statements)

References 29 publications

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“…Cr(VI) usually occurs as the highly soluble anion. The main sources of chromium pollution are mining, leather tanning, cement industries, electro plating, production of steel and other metal alloys, photographic material, and corrosive paints [5][6][7]. The hexavalent form of chromium has been demonstrated to be associated with the toxic parameters and classified as human carcinogen and mutagen [8].…”

Section: Introductionmentioning

confidence: 99%

Kinetic and Mechanistic Study of the Reduction of Chromium(VI) by Lactic Acid

Wang

Song

et al. 2008

International Journal of Inorganic Chemistry

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The kinetics and mechanism of the reduction of chromium(VI) by lactic acid (Lac) in aqueous acidic medium was studied with spectrophotometry in a temperature range of 298.15 K∼313. . There is no salt effect. Based on the experimental results, a probable reaction mechanism of oxidation was proposed. The rate equation derived from the mechanism could explain all the experimental phenomena. Activation parameters along with rate constant of the rate-determining step have been evaluated.

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Section: Introductionmentioning

confidence: 99%

Kinetic and Mechanistic Study of the Reduction of Chromium(VI) by Lactic Acid

Wang

Song

et al. 2008

International Journal of Inorganic Chemistry

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“…On the other hand, concerning solid-state sensors coupled to amperometric or voltammetric detection, Bergamini et al [30] and Sanchez-Moreno et al [31] reported detection of Cr(VI) at pH 2 and 3. Fiol et al [32] prepared vegetable waste-based sensors with selectivity for Cr(VI) and Hg(II) for pH 2-3 with LOD about 2 mM and sensitivity of -61 mV/decade.…”

Section: Introductionmentioning

confidence: 99%

“…Actually, application of screen printed working electrodes for Cr(VI) detection and quantification has been reported in very few cases and at higher pH values [29][30][31] and [35]. The challenges lie in the formulation of screenprintable inks compatible with processing at moderate temperatures, for obtaining acidresistant electrodes that allow working at pH ≤ 1, with an active surface tailored to achieve selective response to Cr(VI) under these conditions.…”

Section: Introductionmentioning

confidence: 99%

Screen-printed electrodes for electroanalytical sensing, of chromium VI in strong acid media

Miscoria

Jacq

Maeder

et al. 2014

Sensors and Actuators B: Chemical

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Highlights• Acid-resistant screen-printed electrodes (SPEs) for Cr(VI) detection were developed.• Carbon-based thick-film SPE pastes were formulated in-house with known composition.• A batch fabrication process allowed simple fabrication of robust sensors.• Cr(VI) at pH 1 was electroanalytically quantified with high sensitivity.• High reproducibility, wide linear range and low detection limit were achieved. AbstractSimple, low-cost and acid-resistant carbon-based screen-printed electrodes (SPEs) addressed to detection of hexavalent chromium species, Cr(VI), in sulfuric acid at pH about 1, were prepared and characterized. Working and counter electrodes were prepared jointly on the same substrate in a single strip (working-counter electrodes pair). The batch printing process allowed obtaining many working-counter electrode pairs in a unique step. The developed working electrodes are comprised of several layers deposited on an alumina substrate: (1) bottom silver conductor, (2) dense organic graphite composite conductor, (3) active layer consisting of a porous organic graphite composite which contains a Cr(III) ionophore for testing Cr(III) obtained after reducing Cr(VI), and (4) an insulating and protective dielectric. All materials except the bottom Ag conductor were made on an organic matrix based on a thermoplastic polymer, polyvinylbutyral (PVB). The amperometric determination of Cr(VI) species at pH 1 was performed over a wide concentration range (dynamic range 3 M 40 mM). The range for linear amperometric response is 3 M 10 mM, with sensitivity about 0.08 mA mM at the electrode surface after the reduction of Cr(VI) when diethylenetriamine-pentaacetic acid (DTPA), a complexing agent for Cr(III) is incorporated into the pastes.

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“…[2][3][4][5] Despite poly-L-lysine having received particular attention as a simple, efficient and rapid supporting material for several applications, polyaminoacids such as poly-L-histidine (PH) have also been described in literature to catalyze the reduction/ oxidation of some biological compounds. [6][7][8][9][10] Poli-L-histidine ( Figure 1) is a synthetic poliaminoacid with an imidazole group (pK a = 6.0) 11 that can be strongly adsorbed onto the surface of silver metal by covalent bonding and it can be employed to facilitate both the reduction and oxidation of myoglobin and cytochrome 6 and also used to catalyze the reduction 7 of NAD + .…”

Section: Introductionmentioning

confidence: 99%

“…Recently, Bergamini et al 8 have shown that a chemically modified electrode with poly-L-histidine can be used for chromium (VI) determination in wastewater. Optimum adherence and stability of the poly-L-histidine film (PHfilm) was obtained by direct addition of 1% PH solution (m/v) onto the electrode surface, followed by heating to 80 o C for 5 min.…”

Section: Introductionmentioning

confidence: 99%

Screen-printed carbon electrode modified with poly-L-histidine applied to gold(III) determination

Bergamini¹,

Santos²,

Zanoni³

2009

J. Braz. Chem. Soc.

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O presente trabalho reporta o desenvolvimento de um novo método voltamétrico para análise de íons ouro(III) usando eletrodo de carbono impresso modificado com poli-L-histidina. O procedimento é baseado no acúmulo do complexo [AuCl 4 ] − , na superfície do eletrodo sob potencial de circuito aberto e tempo de acúmulo controlado. Parâmetros que influenciam na resposta, tais como: preparação do filme, pH, potencial de acúmulo e tempo de acúmulo, foram otimizados e curvas analíticas para os íons ouro foram construídas usando voltametria de varredura linear (LSV), pulso diferencial (DPV), e onda quadrada (SWV). Limites de detecção de 6,0 × 10 −6 mol L -1 , 1,7 × 10 −6 mol L -1 e 4,0 × 10 −6 mol L -1 foram obtidos para LSV, DPV e SWV, respectivamente. O método foi aplicado para a determinação de íons ouro em amostras de urina humana.A sensitive voltammetric method for trace measurements of gold(III) ions using a screen-printed carbon electrode modified with poly-L-histidine is described. The new procedure is based on the accumulation of the tetrachloroaurates complex at the electrode surface under an open circuit potential condition, followed by a cathodic stripping scan of potential. Parameters such as film preparation, pH, accumulation potential and deposition time have been optimized to obtain the best voltammetric response. Using optimal experimental conditions, analytical curves for gold ions were obtained using a linear sweep (LSV), differential pulse (DPV), and square wave voltammetry (SWV). Limits of detection of 6.0 × 10 −6 mol L -1 , 1.7 × 10 -6 mol L -1 and 4.0 × 10 -6 mol L -1 were estimated for the LSV, DPV and SWV, respectively. The method was successfully applied to the determination of gold ions in human urine samples.Keywords: screen-printed electrode, poly-L-histidine, gold ions, stripping voltammetry IntroductionVo l t a m m e t r i c s t r i p p i n g m e t h o d s i nvo l v i n g preconcentration steps are generally very sensitive when used for metal-ion determination. The combination of chemically modified electrodes with stripping methods can offer an excellent alternative for electrochemical analysis of metals at trace levels, 1 increasing not only the sensitivity but also selectivity of the analysis. A common approach to increasing selectivity is to attach host molecules, which selectively interact with specific guest molecules. The properties of polyaminoacids as host molecules for metal ions have been widely explored. [2][3][4][5] Despite poly-L-lysine having received particular attention as a simple, efficient and rapid supporting material for several applications, polyaminoacids such as poly-L-histidine (PH) have also been described in literature to catalyze the reduction/ oxidation of some biological compounds. [6][7][8][9][10] Poli-L-histidine ( Figure 1) is a synthetic poliaminoacid with an imidazole group (pK a = 6.0) 11 that can be strongly adsorbed onto the surface of silver metal by covalent bonding and it can be employed to facilitate both the Vol. 20, No. 1, 2009 reduction an...

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Development of a voltammetric sensor for chromium(VI) determination in wastewater sample

Cited by 76 publications

References 29 publications

Kinetic and Mechanistic Study of the Reduction of Chromium(VI) by Lactic Acid

Kinetic and Mechanistic Study of the Reduction of Chromium(VI) by Lactic Acid

Screen-printed electrodes for electroanalytical sensing, of chromium VI in strong acid media

Screen-printed carbon electrode modified with poly-L-histidine applied to gold(III) determination

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