Trace determination of chromium in various water types by adsorption differential pulse voltammetry

Golimowski, Jerzy; Valenta, P.; Nürnberg, H. W.

doi:10.1007/bf00490915

Cited by 132 publications

(80 citation statements)

References 13 publications

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“…The first procedure for trace chromium determination by AdCSV (adsorptive cathodic stripping voltammetry), described by Golimowski et al, 13 was based on the preconcentration of a Cr(III)-DTPA complex at the HMDE surface and subsequent complex reduction in the presence of nitrate, for signal amplification. This adsorptive method was applied herein to assay chromium in DCs.…”

Section: Chromium Dtpa Ph Gradient and Sequential Methodsmentioning

confidence: 99%

“…98%). 13,14,23 Figure 2A through D show AC voltammograms of the charging currents (phase angle = 90°) as related to the adsorption/desorption process of DTPA, considering the pH gradient used over the entire potential range of the sequential method (-1400 to 0 mV). At pH 6.2, the decrease in charging current with respect to the voltammogram of the supporting electrolyte (Figure 2A) indicates the adsorption of DTPA molecules on the electrode surface.…”

Section: Chromium Dtpa Ph Gradient and Sequential Methodsmentioning

confidence: 99%

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Sequential voltammetric determination of chromium, thallium, cadmium, lead, copper and antimony in saline hemodialysis concentrates using electrolyte pH gradient

Nascimento

Schneider

Bohrer

et al. 2011

J. Braz. Chem. Soc.

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A determinação sequencial de cromo, tálio, cádmio, chumbo, cobre e antimônio em concentrados polieletrolíticos para hemodiálise (DCs) é apresentada. Cromo foi determinado usando voltametria adsortiva de redissolução catódica e tálio, cádmio, chumbo, cobre e antimônio por meio de voltametria de redissolução anódica. O novo método desenvolvido para testar estas amostras se baseia no efeito do gradiente de pH do eletrólito na resposta voltamétrica. Os limites de detecção variaram de 0,03 mg L -1 para cádmio a 0,27 mg L -1 para cobre. Recuperações das amostras variaram de 92,0 a 117,5%. Este método foi aplicado para a análise de DCs comerciais, nos quais as concentrações encontradas dos analitos variaram de 0,16 mg L -1 para antimônio até 140,00 mg L -1 para cobre. Interferências e método de referência são discutidos.The sequential voltammetric determination of chromium, thallium, cadmium, lead, copper and antimony in dialysate concentrates (DCs), is presented herein. Chromium was quantified by adsorptive cathodic stripping voltammetry and thallium, cadmium, lead, copper and antimony were assayed by anodic stripping voltammetry. The novel method developed to test these samples exploits the effect of electrolyte pH gradient on voltammetric response. The limits of detection (LOD) ranged from 0.03 mg L -1 for cadmium to 0.27 mg L -1 for copper. Recoveries from spiked samples were 92.0-117.5%. This method was applied to the analysis of commercial DCs, where the investigated metals were found in some samples at concentrations between 0.16 mg L -1 for antimony and 140.00 mg L -1 for copper. Interferences and the reference method are discussed.

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Section: Chromium Dtpa Ph Gradient and Sequential Methodsmentioning

confidence: 99%

Section: Chromium Dtpa Ph Gradient and Sequential Methodsmentioning

confidence: 99%

Sequential voltammetric determination of chromium, thallium, cadmium, lead, copper and antimony in saline hemodialysis concentrates using electrolyte pH gradient

Nascimento

Schneider

Bohrer

et al. 2011

J. Braz. Chem. Soc.

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show abstract

“…Another example for the adsorptive stripping voltammetry is the determination of chromium using diethylenetriaminepentaacetic (DTPA) acid as chelating agent (detection limit around 20 nmol L -1 [26]. This method has been later modified, the sensitivity enhanced, and even used for chromium speciation with respect to Cr(III) and Cr(VI) [27].…”

Section: Adsorptive Stripping Voltammetry (Adssv)mentioning

confidence: 99%

Voltammetric techniques of analysis: the essentials

Scholz

2015

ChemTexts

160

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This text is written for a course on instrumental methods of quantitative analysis. It summarizes the basic concepts of modern voltammetric techniques of analysis. The guiding concept of this text is to demonstrate how the ratio of faradaic to capacitive currents decides about the sensitivity of the techniques, and how this ratio can be increased by electronics, electrode construction and by chemical means. Finally, the advantages and disadvantages of voltammetric techniques of analysis are briefly described.

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“…The most commonly used technique is based on adsorptive accumulation of the product of the reaction between Cr(VI) and diethyltriaminepentaacetic acid (DTPA) on the hanging mercury drop electrode. The adsorbed deposit is then cathodically stripped, mostly in the presence of nitrate giving rise to an intense catalytic current (Golimowski et al, 1985). Only Cr(VI) species give this product which enables the selective determination of chromate also in the presence of Cr(III).…”

Section: Chromium In Water Samplesmentioning

confidence: 99%

Flow-Through Chronopotentiometry in Waste Water Analysis

Beinrohr¹

2011

Waste Water - Evaluation and Management

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Trace determination of chromium in various water types by adsorption differential pulse voltammetry

Cited by 132 publications

References 13 publications

Sequential voltammetric determination of chromium, thallium, cadmium, lead, copper and antimony in saline hemodialysis concentrates using electrolyte pH gradient

Sequential voltammetric determination of chromium, thallium, cadmium, lead, copper and antimony in saline hemodialysis concentrates using electrolyte pH gradient

Voltammetric techniques of analysis: the essentials

Flow-Through Chronopotentiometry in Waste Water Analysis

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