Determination of nitrate with a flow-injection system combining square-wave polarographic detection with on-line deaeration

Noufi, Mouna; Yarnitzky, Chaim; Ariel, M.

doi:10.1016/s0003-2670(00)83594-1

Cited by 11 publications

(2 citation statements)

References 14 publications

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“…A stronger influence of pH variation on the ES ↔ PN redox transition than on the LS ↔ ES redox transition has also been reported, which also agrees with our system [78,79]. The results indicated that both LS ↔ ES and ES ↔ PN redox transitions of GA@PAni-CNT electrode were more easily observed in the phosphate buffer electrolyte in the pH range The GA@PAni-CNT electrode shows a detection limit (3SD/b) of 0.42 µM at a signal-to-noise ratio of 3, which was quite promising and lower than the values reported so far (Table 1) for indirect electrochemical determination of NO 3 − using modified zeolitic carbon paste electrode and Ag-doped zeolite-expanded graphite-epoxy electrodes [33,36,41,42,88]. The GA@PAni-CNT electrode illustrated a sensitivity of ~443 A/M cm 2 , obtained through the slope of the linear regression.…”

Section: Buffer Electrolyte Selection and Ph Studymentioning

confidence: 67%

Strategic Electrochemical Determination of Nitrate over Polyaniline/Multi-Walled Carbon Nanotubes-Gum Arabic Architecture

Kosa

Khan²,

Ahmed³

et al. 2022

Nanomaterials

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Significant agricultural and industrial activities necessitate the regular monitoring of nitrate (NO3−) ions levels in feed and groundwater. The current comparative study discloses an innovative user-friendly electrochemical approach for the determination of NO3− over polyaniline (PAni)-based modified electrodes. The electrochemical sensors concocted with PAni, multi-walled carbon nanotubes (CNT), and gum arabic (GA). The unique electrode material GA@PAni-CNT was synthesized by facile one-pot catalytic polymerization of aniline (Ani) with FeCl3/H2O2 in the presence of CNT and GA as integral components. As revealed by cyclic voltammetry (CV), the anchoring/retention of NO3− followed by reduction is proposed to occur when a GA@PAni-CNT electrode is immersed in phosphate buffer electrolyte containing NO3− that eventually results in a significantly higher redox activity of the GA@PAni-CNT electrode upon potential scan. The mechanism of NO3− anchoring may be associated with the non-redox transition of leucomeraldine salt (LS) into emeraldine salt (ES) and the generation of nitrite (NO2−) ions. As a result, the oxidation current produced by CV for redox transition of ES ↔ pernigraniline (PN) was ~9 times of that obtained with GA@PAni-CNT electrode and phosphate buffer electrolyte, thus achieving indirect NO3− voltammetric determination of the GA@PAni-CNT electrode. The prepared GA@PAni-CNT electrode displayed a higher charge transfer ability as compared to that of PAni-CNT and PAni electrodes. The optimum square wave voltammetric (SWV) response resulted in two linear concentration ranges of 1–10 (R2 = 0.9995) and 15–50 µM (R2 = 0.9988) with a detection limit of 0.42 µM, which is significantly lower. The GA@PAni-CNT electrode demonstrated the best detection, sensitivity, and performance among the investigated electrodes for indirect voltammetric determination of NO3− that portrayed the possibility of utilizing GA—stabilized PAni and CNT nanocomposite materials in additional electrochemical sensing applications.

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Section: Buffer Electrolyte Selection and Ph Studymentioning

confidence: 67%

Strategic Electrochemical Determination of Nitrate over Polyaniline/Multi-Walled Carbon Nanotubes-Gum Arabic Architecture

Kosa

Khan²,

Ahmed³

et al. 2022

Nanomaterials

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“…The combination of the fl.ow-injection analysis with square-wave voltammetry and on-line deaeration has been applied to the determination of nitrates, utilizing the catalytic reaction between these ions and uranyl ions. This simple method with the detection Iimit of 2 .uM nitrate was applied to the determination of N03 in drinking and river waters [202]. Comparative study of a thin-layer cell for the investigation of stationary and streaming solutions [203] has shown little differences between the fl.owing and quiescent solution in very narrow cells.…”

Section: Selected Applications Of Hydrodynamic E/ectrode Systemsmentioning

confidence: 99%

Basic principles of voltammetry

Fischer

Fischerová

1995

Experimental Techniques in Bioelectrochemistry

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Determination of Nitrates in Water Samples by In‐Electrode Coulometric Titration in Copper Coated Porous Vitreous Carbon Electrode

et al. 2015

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Nitrate in water samples was determined by in‐electrode coulometric titration in porous electrode made of vitreous carbon particles coated with copper. The sample was mixed with diluted sulfuric acid containing 1 mmol/L hydrochloric acid, the solution was filled into the cell and electrode and the nitrate ions were directly reduced by constant current to ammonium ions. The stoichiometry of the electrode reaction was found by coulometric and photometric measurements. The detection limit and precision were found to be 0.2 mg/L and 1.7 %, respectively. The interfering effect of high chloride contents was eliminated by precipitating chlorides with silver sulfate. The method was applied for the analysis of various water samples and beverages. The results were in good agreement with data from isotachophoretic and photometric measurements.

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Determination of nitrate with a flow-injection system combining square-wave polarographic detection with on-line deaeration

Cited by 11 publications

References 14 publications

Strategic Electrochemical Determination of Nitrate over Polyaniline/Multi-Walled Carbon Nanotubes-Gum Arabic Architecture

Strategic Electrochemical Determination of Nitrate over Polyaniline/Multi-Walled Carbon Nanotubes-Gum Arabic Architecture

Basic principles of voltammetry

Determination of Nitrates in Water Samples by In‐Electrode Coulometric Titration in Copper Coated Porous Vitreous Carbon Electrode

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