Differential Pulse Anodic Stripping Voltammetric Determination of Lead(II) with N-p-Chlorophenylcinnamo-hydroxamic Acid Modified Carbon Paste Electrode

Degefa, Tesfaye Hailu; Chandravanshi, Bhagwan Singh; Alemu, Hailemichael

doi:10.1002/(sici)1521-4109(199911)11:17<1305::aid-elan1305>3.3.co;2-u

Cited by 13 publications

(13 citation statements)

References 17 publications

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“…Other class of mercury-free electrodes relies on chemical modifications for metal preconcentrations. Ligands may be immobilized on the electrode surfaces using conductive binders (e.g, carbon paste) [6][7][8][9]. However, these ligands are in loose association with the binders, thus degradation of the sensors due to depletion of the ligands during measurements can occur.…”

Section: Introductionmentioning

confidence: 99%

Detection of Cd, Pb, and Cu in non-pretreated natural waters and urine with thiol functionalized mesoporous silica and Nafion composite electrodes

Yantasee

Charnhattakorn

Fryxell

et al. 2008

Analytica Chimica Acta

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Electrochemical sensors have great potential for environmental monitoring of toxic metal ions in waters due to their portability, field-deployability and excellent detection limits. However, electrochemical sensors employing mercury-free approaches typically suffer from binding competition for metal ions and fouling by organic substances and surfactants in natural waters, making sample pretreatments such as wet ashing necessary. In this work, we have developed mercury-free sensors by coating a composite of thiol self-assembled monolayers on mesoporous supports (SH-SAMMS ™ ) and Nafion on glassy carbon electrodes. With the combined benefit of SH-SAMMS ™ as an outstanding metal preconcentrator and Nafion as an antifouling binder, the sensors could detect 0.5 ppb of Pb and 2.5 ppb of Cd in river water, Hanford groundwater, and seawater with a minimal amount of preconcentration time (few minutes) and without any sample pretreatment. The sensor could also detect 2.5 ppb of Cd, Pb, and Cu simultaneously. The electrodes have long service times and excellent single and inter-electrode reproducibility (5% RSD after 8 consecutive measurements). Unlike SAMMS ™ -carbon paste electrodes, the SAMMS ™ -Nafion electrodes were not fouled in samples containing albumin and successfully detected Cd in human urine. Other potentially confounding factors affecting metal detection at SAMMS ™ -Nafion electrodes were studied, including pH effect, transport resistance of metal ions, and detection interference. With the ability to reliably detect low metal concentration ranges without sample pretreatment and fouling, SAMMS ™ -Nafion composite sensors have the potential to become the next generation metal analyzers for environmental and bio-monitoring of toxic metals.

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Section: Introductionmentioning

confidence: 99%

Detection of Cd, Pb, and Cu in non-pretreated natural waters and urine with thiol functionalized mesoporous silica and Nafion composite electrodes

Yantasee

Charnhattakorn

Fryxell

et al. 2008

Analytica Chimica Acta

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“…The maximum peak current was observed in 0.1 M ammonium acetate. The increasing of the concentration of ammonium acetate was found to decrease the peak current due to the formation of a weak complex between acetate with Pb(II) 24 . Consequently, an optimum ammonium acetate concentration of 0.1 M was selected for the next experiments.…”

Section: Effect Of Supporting Electrolyte Concentrationmentioning

confidence: 99%

Lead determination in canned food by square-wave adsorptive cathodic stripping voltammetry

Wararattananurak¹,

Chooto²,

Sherdshoopongse³

et al. 2014

ScienceAsia

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A sensitive and rapid method to analyse Pb(II) in canned fish samples was developed using square-wave adsorptive cathodic stripping voltammetry based on the adsorptive accumulation of 8-hydroxyquinoline complexes of Pb(II) onto a hanging mercury drop electrode, followed by reduction of adsorbed species by voltammetric scan with square wave pulse modulation. The optimum conditions were found to be 0.1 M CH 3 COONH 4 as a supporting electrolyte, pH 7.5, 8-hydroxyquinoline concentration of 15 µM, accumulation potential −0.70 V (versus Ag/AgCl), accumulation time 120 s, scan rate 0.3 V/s, and pulse amplitude 20 mV. Under the optimum conditions a linear calibration graph was obtained in the concentration range of 0.5-90.0 µg/l with correlation coefficient 0.9973, a limit of detection of 0.108 µg/l, and a limit of quantification of 0.360 µg/l. The recovery values were obtained in the range 93.7-95.1%. The relative standard deviations (n = 10) at lead concentration 5.0 µg/l was 2%. The method was successfully applied to the determination of lead content in canned fish samples. The concentration of Pb(II) in canned fish samples (wet weight) was found to be in the range of 0.121-0.285 µg/g, which is lower than the limit (1.00 µg/g) issued by the Ministry of Public Health of Thailand.

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“…This kind of interaction may pose effective chelation with enhanced coordination which may provide lower detection limits. The complexation behavior of metal ions at the interface and the possible mechanism of preconcentration as well as stripping steps are given as below [21,33].…”

Section: Voltammetry Of Pb 2+ and CD 2+ Ions At Salicylic Acid Modifimentioning

confidence: 99%

“…However the precipitation is not observed in the present studies because the metal ions were added into the electrochemical cell just before the analysis. It is well known that the acetate ions form weak complexes with these metal ions and prevent their precipitation [33,34]. Hence sodium acetate solution of pH 8 was used as an optimum pH in all further studies.…”

Section: Optimization Studymentioning

confidence: 99%

A binderless, covalently bulk modified electrochemical sensor: Application to simultaneous determination of lead and cadmium at trace level

Kempegowda

Malingappa

2012

Analytica Chimica Acta

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a b s t r a c tA new type of covalent binderless bulk modified electrode has been fabricated and used in the simultaneous determination of lead and cadmium ions at nanomolar level. The modification of graphitic carbon with 4-amino salicylic acid was carried out under microwave irradiation through the amide bond formation. The electrochemical behavior of the fabricated electrode has been carried out to decipher the interacting ability of the functional moieties present on the modifier molecules toward the simultaneous determination of Pb 2+ and Cd 2+ ions using cyclic and differential pulse anodic stripping voltammetry. The possible mode of interaction of functional groups with metal ions is proposed based on the pKa values of the modifier functionalities present on the surface of graphitic carbon particles. The analytical utility of the proposed sensor has been validated by measuring the lead and cadmium content from pretreated waste water samples of lead acid batteries.

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Differential Pulse Anodic Stripping Voltammetric Determination of Lead(II) with N-p-Chlorophenylcinnamo-hydroxamic Acid Modified Carbon Paste Electrode

Cited by 13 publications

References 17 publications

Detection of Cd, Pb, and Cu in non-pretreated natural waters and urine with thiol functionalized mesoporous silica and Nafion composite electrodes

Detection of Cd, Pb, and Cu in non-pretreated natural waters and urine with thiol functionalized mesoporous silica and Nafion composite electrodes

Lead determination in canned food by square-wave adsorptive cathodic stripping voltammetry

A binderless, covalently bulk modified electrochemical sensor: Application to simultaneous determination of lead and cadmium at trace level

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