Redox Speciation of Inorganic Arsenic in Water and Saline Samples by Adsorptive Cathodic Stripping Voltammetry in the Presence of Sodium Diethyl Dithiocarbamate

The contribution of electrochemical methods to the knowledge of dynamic speciation of toxic trace elements in marine waters is critically reviewed. Due to the importance of dynamic considerations in the interpretation of the electrochemical signal, the principles and recent developments of kinetic features in the interconversion of metal complex species will be presented. As dynamic electrochemical methods, only stripping techniques (anodic stripping voltammetry and stripping chronopotentiometry) will be used because they are the most important for the determination of trace elements. Competitive ligand exchange-adsorptive cathodic stripping voltammetry, which should be considered an equilibrium technique rather than a dynamic method, will be also discussed because the complexing parameters may be affected by some kinetic limitations if equilibrium before analysis is not attained and/or the flux of the adsorbed complex is influenced by the lability of the natural complexes in the water sample. For a correct data interpretation and system characterization the comparison of results obtained from different techniques seems essential in the articulation of a serious discussion of their meaning.

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“…115,116 2.6. Perspectives and Future Trends in Trace Metal Complexation in Seawaters by Electrochemical Methods.…”

Section: Stripping Chronopotentiometry (Scp)mentioning

confidence: 99%

Electrochemical Methods for Speciation of Trace Elements in Marine Waters. Dynamic Aspects

2012

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“…Matrix exchange differential pulse stripping voltammetry was used for the determination of total arsenic in gold samples [21]. Cathodic stripping voltammetry with a hanging mercury drop electrode was used for the determination of As(III) and As(V) in seawater samples [22]. Using a gold electrode with differential pulse anodic stripping voltammetry, trace As(III) in natural waters and in biological samples was determined [23].…”

Section: Introductionmentioning

confidence: 99%

A Study for the Evaluation of Quantitative Reaction Conditions Between As(V) and Ti(III) for the DP Polarographic Determination of Electroinactive As(V) and Application

Somer¹,

Şendil²,

Ekmekci³

et al. 2017

Eurasian J Anal Chem

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In this investigation a differential pulse polarographic method (DPP) is established to determine the electroinactive arsenic (V), which is formed after the wet digestion of the natural samples. For this purpose, As(V) formed is reduced into As(III) using Ti(III). According to the literature survey this redox reaction between As(V) and Ti(III) has been used first time in this work. In order to have the reaction quantitative the optimum reaction conditions such as Ti(III)/ As(V) concentration ratio, reaction pH, waiting time for reaction and temperature had to be investigated. It was found that Ti(III)/ As(V) concentration ratio had to be larger than 3-5 times, HCl concentration 0.4 to 1.0 M, reaction temperature 60 -90 º C and waiting interval 3-5 minutes. Under the experimentally decided conditions the reduction was very fast and quantitative. No interference was observed from most common ions. The LOD was found as 1.5×10 -7 M. The newly developed method is applied for the determination of arsenic in beer. The reduction procedure takes place directly in polarographic cell. This newly developed method can safely be used for the speciation of As(III) and As(V) and for total arsenic quantity determination in natural samples.

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“…The HMDE offers the advantage of continuous renewal of the electrode surface, and it is even possible to use it as static mercury drop electrode (SMDE) for which a minimal amount of mercury is used [20][21][22][23][24][25][26][27][28][29][30][31] . CSV is used to determine low concentrations of As, it is necessary to carry out the As (III) deposition in the surface of mercury, the formation of an intermetallic compound, being Cu 29,31 and Se 28 used for this purpose.…”

Section: Introductionmentioning

confidence: 99%

Determination of Arsenic (Iii) by Differential Pulse Polarography in the Waters of Camarones Area, Chile

Gamboa

Cornejo

Acarapi³

et al. 2013

J. Chil. Chem. Soc.

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As (III) was determined by differential pulse polarography (DPP) in 1 mol L -1 HCl as supporting electrolyte. For quantification, the -0.35 V peak (versus Ag/ AgCl) was chosen. The obtained detection and quantification limits were 2.7 (3 SD) and 8.9 (10 SD) μg L -1 respectively. The method was used for the determination of As (III) on surface water samples from Camarones River, located in Camarones area, province of Arica, Chile (this area's water contain high levels of salinity). The results indicate that the proposed methodology is a suitable analytical alternative for As determination in natural waters with high levels of dissolved salts, as the waters of Camarones River. The method is not time consuming, nor tedious no prior treatment of the sample is required. The results show that As (III) concentrations in waters of Camarones River are about 10 times higher than the guide values established by WHO for water intended for human consumption.

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Redox Speciation of Inorganic Arsenic in Water and Saline Samples by Adsorptive Cathodic Stripping Voltammetry in the Presence of Sodium Diethyl Dithiocarbamate

Cited by 15 publications

References 26 publications

Electrochemical Methods for Speciation of Trace Elements in Marine Waters. Dynamic Aspects

Electrochemical Methods for Speciation of Trace Elements in Marine Waters. Dynamic Aspects

A Study for the Evaluation of Quantitative Reaction Conditions Between As(V) and Ti(III) for the DP Polarographic Determination of Electroinactive As(V) and Application

Determination of Arsenic (Iii) by Differential Pulse Polarography in the Waters of Camarones Area, Chile

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