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

Nascimento, Paulo Cı́cero do; Schneider, Alexandre B.; Bohrer, Denise; Carvalho, Leandro Machado de; Jost, Cristiane Luisa

doi:10.1590/s0103-50532011000500003

Cited by 10 publications

(9 citation statements)

References 25 publications

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“…The adsorption and reaction mechanisms of Cr species with DTPA at mercury electrodes have also been well described in the literature 35. Furthermore, Tl can also be selectively determined using the same complexing electrolyte 22. In this work, other interferences were systematically investigated.…”

Section: Resultsmentioning

confidence: 88%

“…The last step for Sequential Method II was the addition of ammonium acetate to buffer the medium at pH 4.6 for Tl determination. The use of DTPA was also necessary to eliminate interferences from the elements determined in the previous steps (mainly Pb and Cd) 22. Thus, the presence of DTPA was essential due to its complexing effect on several elements (Table 2), which allowed the determination of Tl because of its relatively low formation constant compared to the other interfering elements (e.g., Pb, Cd, Cu) analyzed in the previous proposed steps.…”

Section: Resultsmentioning

confidence: 99%

“…Finally, the last step of the Method II involved adjusting the electrolyte acetate buffer to pH 4.6 to determine Tl + by ASV, where the peak potential was observed at −0.55 V 22.…”

Section: Methodsmentioning

confidence: 99%

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Sequential Determination of 13 Elements in Complex Matrices by Stripping Voltammetry with Mixed Complexing Electrolytes

et al. 2015

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This paper presents the determination of 13 elements in a simultaneous and sequential analysis using solochrome violet (SVRS), chloranilic acid (CA), diethylenetriaminepentaacetic acid (DTPA), dimethylglyoxime (DMG), and oxine as complexing electrolytes. The Methods were applied to determine Al3+, Fe3+, Mo6+, Zn2+, Cd2+, Pb2+, Cu2+, Ni2+, Co2+, Tl+, U6+, V5+, and Cr6+ in fertilizers, plant materials, and foodstuffs. The Method was found to be selective and accurate (82.13–119.03 %) for elemental analysis in complex matrices that were previously submitted to a total oxidative digestion step (calcination and wet digestion). Mutual interferences of the elements were systematically investigated. The Sequential Method could be useful for the routine quality control of foodstuffs and fertilizer formulations regarding mineral nutrients or contaminants.

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Section: Resultsmentioning

confidence: 88%

Section: Resultsmentioning

confidence: 99%

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Sequential Determination of 13 Elements in Complex Matrices by Stripping Voltammetry with Mixed Complexing Electrolytes

et al. 2015

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“…50 Devido à versatilidade da voltametria e baixa ou inexistente necessidade de tratamento de amostra, diferentes matrizes além das ambientais pertencem ao escopo que podem ser estudadas pela técnica. Amostras como composições farmacêuticas, [51][52][53][54] 10 -100 μg L 91 AC = corrente alternada; ASV = voltametria de redissolução anódica; CSV = voltametria de redissolução catódica; CV = voltametria cíclica; DP = pulso diferencial; NI = não informado; SV = voltametria de redissolução; SW = onda quadrada. Tabela 1.…”

Section: Determinação De íOns Metálicos Usando O Hmdeunclassified

A Versatilidade Do Eletrodo De Gota Pendente De Mercúrio Em Química Analítica – Uma Revisão Sobre Recentes Aplicações

Nunes¹,

Anjos²,

Quináia³

2017

Quim. Nova

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THE VERSATILITY OF THE HANGING MERCURY DROP ELECTRODE IN ANALYTICAL CHEMISTRY -A REVIEWABOUT RECENT APPLICATIONS. Voltammetry using mercury electrode as working electrode has been employed in the determination of organic and inorganic compounds in several samples. A review on the applications of this analytical tool is present, covering the period of the last ten years. The emphasis of this work is directed to the hanging mercury drop electrode (HMDE), its advantages, disadvantages and applications. Voltammetric measurements are easily carried out, and present low cost. The review discusses that the use of mercury in the measurements can be a limitation due the toxicity of the element. However, nowadays the necessary of volume of Hg in the measurements is very small, and it can be reused. Thus, the correct disposal of the small amount of waste generated can be minimize environmental risks and human health, according to the principles of Green Chemistry.Keywords: applications; mercury electrode; review; voltammetry. INTRODUÇÃOTécnicas eletroquímicas têm sido usadas por muitos anos devido as suas características vantajosas, tais como elevada frequência analí-tica, simplicidade, baixo custo, capacidade de detecção em níveis de concentração baixa, resposta dependente das formas químicas de um mesmo elemento, análise de misturas, entre outras. Os primeiros estudos eletroquímicos iniciaram no século XVIII na Itália e evoluíram até os métodos atuais, envolvendo diversos tipos de eletrodos indicadores e de trabalho, como eletrodos sólidos, de mercúrio, ultramicroeletrodos, etc.1-4 Cada tipo de eletrodo desenvolvido possui vantagens e desvantagens intrínsecas. Eletrodos de trabalho sólidos, por exemplo, apresentam como vantagem a possibilidade de serem modificados, aumentando assim sua seletividade, além de possuírem diversas formas e tamanhos que ampliam sua aplicabilidade. Entretanto, processos de limpeza e polimento são comumente necessários devido ao envenenamento da superfície eletrolítica, que podem comprometer a reprodutibilidade de sua área superficial. O eletrodo de gota pendente de mercúrio, do inglês hanging mercury drop electrode (HMDE), por sua vez, por ser renovável apresenta excelente reprodutibilidade, uma superfície extremamente lisa e uniforme a cada gota. Além disso, um elevado sobrepotencial à redução de hidrogênio, uma ampla faixa negativa de potencial (de 0 a -2 V dependendo do eletrólito suporte) assim como a superfície reprodutível a cada gota, são vantagens deste eletrodo.5 Entretanto, o HMDE apresenta baixa resistência mecâni-ca, limitando suas aplicações, bem como relativa seletividade para compostos orgânicos, pode sofrer com interferências causadas por matéria orgânica dissolvida em amostras ambientais, estreita faixa de trabalho na região anódica, etc. Além disso, muitas discussões vêm sendo realizadas com relação à toxicidade do mercúrio e a necessidade de buscar materiais alternativos para o desenvolvimento de outros eletrodos de trabalho mais condizentes com os aspectos de Química Verde. ...

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“…Ensuring the quality of dialysis water can be a challenge, since each patient is exposed to between 18,000 and 36,000 l of water per year [3], and high water quality is extremely important in order to avoid exposure of these individuals to chemical and microbial contaminants [4]. The literature reports several analytical methods for the detection of metal contaminants, with the aim of minimizing the possibility of patient exposure [5][6][7][8]. However, to the best of our knowledge, there have been no reported studies concerning the detection of pharmaceutical compounds such as diuretics in the water used for dialysis.…”

Section: Introductionmentioning

confidence: 99%

Adsorptive stripping voltammetry for simultaneous determination of hydrochlorothiazide and triamterene in hemodialysis samples using a multi-walled carbon nanotube-modified glassy carbon electrode

Hudari

Souza

Zanoni

2018

Talanta

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Hemodialysis is the most commonly used method for the treatment of chronic kidney disease. In this procedure, some patients use diuretics to control weight gain and blood pressure. In this work, a voltammetric sensor based on a glassy carbon electrode modified with carbon nanotubes (GCE/MWCNT) is described for the simultaneous determination of the diuretics hydrochlorothiazide (HCT) and triamterene (TRT). The oxidation of the diuretics on the GCE/MWCNT surface was observed at 1.01 and 1.17V for HCT and TRT, respectively, allowing simultaneous determination, which was not possible with the unmodified glassy carbon electrode. The GCE/MWCNT electrode provided 6-fold and 10-fold gains in anode peak intensity for HCT and TRT, respectively, compared to the unmodified electrode. After optimization of the conditions (pH, accumulation time, and accumulation potential), analytical curves were constructed for the analytes in the range from 1.0 × 10 to 2.0 × 10molL. The detection limits for HCT and TRT were 2.8 × 10 and 2.9 × 10molL, respectively. A high performance liquid chromatography method with diode array detection was also developed for the determination of HCT and TRT in hemodialysis samples, for comparison with the electroanalytical method.

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

Cited by 10 publications

References 25 publications

Sequential Determination of 13 Elements in Complex Matrices by Stripping Voltammetry with Mixed Complexing Electrolytes

Sequential Determination of 13 Elements in Complex Matrices by Stripping Voltammetry with Mixed Complexing Electrolytes

A Versatilidade Do Eletrodo De Gota Pendente De Mercúrio Em Química Analítica – Uma Revisão Sobre Recentes Aplicações

Adsorptive stripping voltammetry for simultaneous determination of hydrochlorothiazide and triamterene in hemodialysis samples using a multi-walled carbon nanotube-modified glassy carbon electrode

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