Electrochemical sensing of cadmium and lead ions at zeolite-modified electrodes: Optimization and field measurements

Kumar, S.; Saraswathi, R.

doi:10.1016/j.snb.2009.05.029

Cited by 84 publications

(26 citation statements)

References 62 publications

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“…[11][12][13][14][15] Currently, Martinez et al 16 reported many meaningful works on paper-based devices. A simple method was proposed for patterning paper to create well-defined and millimeter-sized channels for simultaneous detection of glucose and protein in urine.…”

Section: 10mentioning

confidence: 99%

Electrochemical detection of Pb and Cd in paper-based microfluidic devices

Shi¹,

Tang²,

Xing³

et al. 2012

J. Braz. Chem. Soc.

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Tiras de papel de filtro combinadas com eletrodos de carbono impresso (SPCE) foram usadas na montagem de um dispositivo microfluídico para detecção de Pb(II) and Cd(II) em soluções aquosas. O dispositivo microfluídico portátil (com detecção eletroquímica direta) foi testado na quantificação direta de analitos (Pb(II) e Cd(II)) em amostras aquosas contaminadas sem pré-tratamentos. O sinal voltamétrico de redissolução anódica de onda quadrada (SWASV) foi bastante intensificado e apresentou excelente desempenho analítico na detecção de Pb(II) e Cd(II) (de 0 a 100 ppb) com baixo limite de detecção (2,0 e 2,3 ppb, respectivamente). Os dispositivos eletroquímicos propostos também apresentaram boa seletividade e estabilidade para análises de amostras reais de refrigerante e água subterrânea com contaminação física. O dispositivo é simples, de baixo custo, fácil fabricação e portátel. Este dispositivo analítico tem a possibilidade de ser útil em aplicações do tipo point-of-care no monitoramento ambiental, na saúde pública e na segurança alimentar.Filter paper strips combined with screen-printed carbon electrodes (SPCE) were used in the assembly of a microfluidic device for detecting Pb(II) and Cd(II) in aqueous samples. The portable microfluidic device (with direct electrochemical detection) was tested for direct quantification of multiple analytes (Pb (II) and Cd(II)) in contaminated aqueous samples without pretreatment. Square wave anodic stripping voltammetric (SWASV) signal was greatly enhanced and displayed excellent analytical performance for Pb(II) and Cd(II) detection (from 0 to 100 ppb) with low limit of detection of 2.0 and 2.3 ppb, respectively. The proposed electrochemical devices also exhibited good selectivity and stability for analyses of real samples of gas dissolved salty soda water and ground water with physical contamination. The device is simple, low-cost, easy-to-fabricate and portable. This analytical device has the possibility of being useful for point-of-care applications in environmental monitoring, public health and food safety.Keywords: microfluidic devices, screen-printed carbon electrodes, filter paper strip, portable device IntroductionAnalytical instrumentations tend to be miniaturization and intellectualization for in situ applications.1-4 Therefore, it can be convenient for real-time and on-line monitoring in the fields of environmental monitoring, biomedical science, agriculture, military analysis and industrial process monitoring, etc. Paper represents a great and useful supporting material for developing sensing devices owing to its various unique advantages, such as inexpensive, easy-printed, biodegradable and the porous structure facilitates lateral-flow assays suitable for chromatographic separations and as good filter.5-8 Screen-printing technology can be easily applied to the mass production of inexpensive, reproducible and sensitive disposable electrodes. 9,10Paper-based micro-electrochemical device integrated screen-printed carbon electrodes (SPCE) can meet the requirements fo...

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Section: 10mentioning

confidence: 99%

Electrochemical detection of Pb and Cd in paper-based microfluidic devices

Shi¹,

Tang²,

Xing³

et al. 2012

J. Braz. Chem. Soc.

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“…The Nyquist plots of bare gold (a), AHMP/Au (b) and BA/AHMP/Au (c) electrodes in the presence of Fe(CN) 6 3À /Fe(CN) 6 4À vs. Ag/AgCl/KCl sat were presented in Figure 1. The data were approximated using appropriate equivalent circuit models.…”

Section: Characterization Of the Modified Gold Electrodementioning

confidence: 99%

“…[5]. For this reason, up to now, several methods including atomic absorption spectrometry, UV-Vis spectroscopy, colorimetric analysis, ion chromatography, inductively coupled plasma mass spectrometry and electroanalytical techniques have been proposed for the determination of heavy metals [6,7]. Among these techniques, electrochemical sensors have great potential for environmental and biological monitoring of toxic metal ions in drinking or waste water and biological samples as blood, urine etc.…”

Section: Introductionmentioning

confidence: 99%

Electrochemical Determination of Cu(II) Ions by 4‐Formylphenylboronic Acid Modified Gold Electrode

2011

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A self-assembled monolayer (SAM) modified by 4-formylphenylboronic acid was formed on the gold electrode, which was applied for the determination of trace concentrations of Cu(II). The formation of advanced SAM on the gold electrode was evidenced by electrochemical impedance spectroscopy, atomic force microscopy and contact angle measurements. Electrochemical determination of Cu(II) ions was performed by square wave voltammetry. Some mutual interferences caused by Cd(II), Co(II), Fe(II), Ni(II) and Pb(II) ions were investigated and it was demonstrated how the negative effects of these interfering ions could be eliminated by adjustment of proper parameters of square wave voltammetry.

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“…Many methods have been developed to detect Cd, including inductively coupled plasma mass spectrometry, atomic absorption spectrometry, and electrochemical and fluorescence sensing techniques [4][5][6][7]. Among these methods, fluorescence techniques are highly reliable and sensitive for metal ion detection.…”

Section: Introductionmentioning

confidence: 99%

A Label-Free Aptamer-Based Fluorescent Assay for Cadmium Detection

Luan

Chen

et al. 2016

Applied Sciences

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Selective detection of ultratrace amounts of cadmium (Cd 2+ ) is extremely important for food safety and environmental monitoring because of its toxicity and widespread use. In this work, we developed a facile, rapid, sensitive, and highly selective method for the detection of Cd 2+ based on a label-free aptasensor using an unmodified double-stranded deoxyribonucleic acid-specific dye (PicoGreen). The linear range was 0.10-100 µg/mL, and the detection limit (0.038 ng/mL) was lower than the guideline from the World Health Organization for Cd 2+ in drinking water (3 ng/mL). The sensor exhibited excellent selectivity towards Cd 2+ ions. We tested the aptasensor in application to a series of real water samples spiked with different concentrations of Cd 2+ . Compared with atomic absorption spectrometry, the results showed good tolerance to the matrix effect. The developed approach shows great potential for on-site and high-throughput analysis in routine monitoring.

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Electrochemical sensing of cadmium and lead ions at zeolite-modified electrodes: Optimization and field measurements

Cited by 84 publications

References 62 publications

Electrochemical detection of Pb and Cd in paper-based microfluidic devices

Electrochemical detection of Pb and Cd in paper-based microfluidic devices

Electrochemical Determination of Cu(II) Ions by 4‐Formylphenylboronic Acid Modified Gold Electrode

A Label-Free Aptamer-Based Fluorescent Assay for Cadmium Detection

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