Determination of sub-nanomolar concentration of arsenic(III) in natural waters by square wave cathodic stripping voltammetry

Li, Hong; Smart, Ronald B.

doi:10.1016/0003-2670(96)00011-6

Cited by 92 publications

(76 citation statements)

References 17 publications

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“…Beyond these concentrations, the peak disappeared. These types of behaviour were similar to those found by others 17,21,22 which demonstrate the formation of an intermetallic compound with a different Cu:As ratio 16 . A Cu II concentration of 45 mg/l was therefore chosen for As III determination.…”

Section: Effect Of Cu II Concentrationsupporting

confidence: 90%

“…Electrochemical techniques are considered to be an alternative way commonly used to differentiate inorganic arsenic species. These techniques are well known as a simple, sensitive, and inexpensive methods to speciate arsenic directly since As III and As V have different electroactivity 16,17 . Stripping voltammetric techniques are considered to be an attractive method for the determination of some arsenic species in environmental samples with the preconcentration of the analyte on the working electrode prior to the actual determination step during the potential scan.…”

Section: Introductionmentioning

confidence: 99%

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Determination of inorganic arsenic species by hydride generation atomic absorption spectrophotometry and cathodic stripping voltammetry

Chooto¹,

Wararattananurak²,

Kangkamano³

et al. 2015

ScienceAsia

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Flow injection-hydride generation-atomic absorption spectrophotometry (FI-HG-AAS) and square wave cathodic stripping voltammetry (SWCSV) were compared to detect inorganic arsenic species in lemongrass and turmeric. Two species, arsenite (As III ) and arsenate (As V ), were considered as they are known to occur in most terrestrial plants. As III and total water-soluble inorganic arsenic (TAs inorg ) were determined under different conditions.As III was selectively determined by using a soft generation condition, i.e., low HCl concentration, whereas TAs inorg was determined after pre-reduction of As V to As III with a KI/ascorbic acid mixture. The As V content was estimated as the difference between both measurements. Under optimal conditions, the limits of detection (LOD) by FI-HG-AAS were 0.02 and 0.03 µg/l for As III and TAs inorg , respectively. Relative standard deviations (n = 9) of less than 4% were obtained for both inorganic arsenic species. The accuracy was also verified by analysing spiked samples and certified reference material: CTA-VTL-2 (Virginia Tobacco leaves). The recoveries of both species were found to be between 90 and 115%. The determination of inorganic arsenic species by SWCSV in the samples is based on the formation of a copper-arsenic intermetallic compound at the hanging mercury drop electrode (HDME) during the preconcentration step. Only As III was deposited on the Hg electrode when Cu was present in the HCl medium. TAs inorg can be determined by reducing As V to As III with sodium thiosulphate. As V is quantified as the difference. At optimum conditions, the LOD for As III and As V were 0.5 and 0.4 µg/l, respectively. Relative standard deviations (n = 10) of less than 5% were obtained and the method was validated by analysing the spiked samples and certified reference material. FI-HG-AAS showed better LOD than SWCSV for both inorganic arsenic species. There was, however, a strong agreement between TAs values obtained by using FI-HG-AAS and SWCSV technique in lemongrass, turmeric, and the certified reference material (CTA-VTL-2). As V was the main inorganic arsenic species found in lemongrass and turmeric. The results confirm that the As content of both samples do not exceed the food safety limits for Thailand and several countries.

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Section: Effect Of Cu II Concentrationsupporting

confidence: 90%

Section: Introductionmentioning

confidence: 99%

Determination of inorganic arsenic species by hydride generation atomic absorption spectrophotometry and cathodic stripping voltammetry

Chooto¹,

Wararattananurak²,

Kangkamano³

et al. 2015

ScienceAsia

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“…According to previous literature [18,38], at first we examined the electrochemical behavior of NEEs in 1 M HCl, 62 mM hydrazine [18,[38][39][40][41][42]. Figure 2a shows the square wave voltammograms recorded at NEE in 1 M HCl.…”

Section: Selection Of the Electrolytementioning

confidence: 99%

Electroanalysis of Trace Inorganic Arsenic with Gold Nanoelectrode Ensembles

Mardegan¹,

Scopece²,

Lamberti³

et al. 2012

Electroanalysis

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The results of a study on the determination of trace levels of arsenic with nanoelectrode ensembles (NEEs) are reported. In order to lower the detection limit and to increase the number of performable analysis for each NEE, the right choice of the supporting electrolyte concentration and electroanalytical parameters were optimized. The electrochemical behavior of As(III) at NEEs was studied at first by cyclic voltammetry, while trace concentrations of As(III) were determined by anodic stripping square wave voltammetry. The method is characterized by a detection limit as low as 5 ng/L (65 pM) after 3 min preconcentration at À0.4 V. Finally, NEEs were applied to trace As analysis in real samples such as certified seawater samples.

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“…Em trabalhos mais recentes 14,53,63 , observa-se um emprego freqüente da voltametria de onda quadrada, onde limites de detecção e tempos de análise menores podem ser alcançados. A Tabela 1 apresenta um sumário dos principais métodos voltamétricos desenvolvidos para a especiação de arsênio inorgânico empregando a CSV.…”

Section: Determinação De Arsênio Utilizando Csvunclassified

Especiação analítica de compostos de arsênio empregando métodos voltamétricos e polarográficos: uma revisão comparativa de suas principais vantagens e aplicações

Carvalho¹,

Nascimento²,

Bohrer³

et al. 2004

Quím. Nova

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Recebido em 6/1/03; aceito em 5/8/03 SPECIATION ANALYSIS OF ARSENIC COMPOUNDS BY VOLTAMMETRIC AND POLAROGRAPHIC METHODS: A COMPARATIVE REVIEW OF THEIR MAIN ADVANTAGES AND APPLICATIONS. This paper provides a review on voltammetric and polarographic methods for the speciation analysis of inorganic and organic arsenic compounds in different matrices. A discussion on the main advantages of electroanalytical methods in comparison with other analytical methods employed for arsenic speciation is presented. The mechanistic aspects of the most relevant techniques employing cathodic and anodic stripping voltammetry as well as polarographic methods published in the last twenty five years are summarized and discussed. The bibliographic references cited in this work were selected from the Web of Science (published by the ISI) and the main journals of analytical chemistry.Keywords: arsenic speciation; voltammetry; polarography. INTRODUÇÃOA especiação analítica consiste na identificação e quantificação de diferentes espécies que, juntas, correspondem à concentração total de um determinado elemento. Devido ao fato de a toxicidade de um elemento depender, dentre outras coisas, do seu estado de oxidação e da forma como está ligado, a especiação proporciona uma maior e mais ampla obtenção de informações quando comparada à sua simples análise como um todo.A especiação de compostos de arsênio tem se tornado objeto de estudo de vários pesquisadores nos últimos anos, com uma atenção cada vez maior sendo dada aos riscos apresentados pela contaminação de arsênio em ambientes aquáticos naturais [1][2][3][4][5] . . Águas subterrâneas contêm arsênio nas formas arsenito e arsenato, ao passo que em águas marinhas, lagoas e lagos, as espécies arsenito e arsenato ocorrem conjuntamente com as espé-cies orgânicas MMA e DMA 9 . Com relação à toxicidade das espéci-es de arsênio, sabe-se que os compostos inorgânicos são 100 vezes mais tóxicos do que as formas metiladas MMA e DMA. O arsênio trivalente (arsenito) é 60 vezes mais tóxico do que a forma oxidada pentavalente (arsenato), sendo que ambas as formas têm comprovadamente efeitos carcinogênicos 10,11 . A liberação de compostos de arsênio no meio ambiente está associada com uma variedade de processos industriais ligados, por exemplo, à produção de vidros, plásticos, produtos químicos e farmacêuticos, materiais semicondutores e eletrônicos, mineração e, também, com o uso de pesticidas e herbicidas à base de arsênio 11,12 . Uma vez liberados no meio ambiente, compostos de arsênio atingem fontes de água potável como mananciais, rios e lençóis freáticos, podendo chegar também aos sistemas municipais de tratamento de água. , dependendo da composição geoquímica e da atividade antropogênica associada a determinada região 13,14 . Devido ao fato de a biodisponibilidade e os efeitos toxicológicos do arsênio dependerem significativamente de sua forma química, o conhecimento da sua especiação torna-se muito importante em diversas áreas. Entretanto, métodos analíticos adequados que possibilitem a determinaçã...

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Determination of sub-nanomolar concentration of arsenic(III) in natural waters by square wave cathodic stripping voltammetry

Cited by 92 publications

References 17 publications

Determination of inorganic arsenic species by hydride generation atomic absorption spectrophotometry and cathodic stripping voltammetry

Determination of inorganic arsenic species by hydride generation atomic absorption spectrophotometry and cathodic stripping voltammetry

Electroanalysis of Trace Inorganic Arsenic with Gold Nanoelectrode Ensembles

Especiação analítica de compostos de arsênio empregando métodos voltamétricos e polarográficos: uma revisão comparativa de suas principais vantagens e aplicações

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