Polarographic Determination of Nitrates in Sanitary Analysis

Rand, M. C.; Heukelekian, H.

doi:10.1021/ac60078a008

Cited by 22 publications

(5 citation statements)

References 11 publications

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“…The second wave appeared only in the first cycle and was increased by nitrate. The cyclic voltammograms of Cd( II)/ Cu ( 11) mixtures, Cd(II), and Zn(I1) were quite similar to the curves obtained with pyrolytic graphite and glassy carbon electrodes, and the effect of nitrate was also the same [27-291.…”

Section: Resultsmentioning

confidence: 65%

Voltammetric determination of nitrate with a modified carbon paste electrode

et al. 1994

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4 method for the voltammetric determination of nitrate in drinking water is presented. 1. 1 itrate exerts a catalytic effect on the reduction and reoxidation of thallium (1 f-, 0) in cyclic and differential pulse voltammetn, leading to a peak enhancement. Nitrate can be preconcentrated together with tetrachlorothallate( 111) from hydrochloric acid solutions onto a carbon paste electrode modified with a liquid anion exchanger (Amberlite I N ) under open circuit conditions. After reduction of the TI(II1) to TI(0) at the electrode surface at a potential of -1.2 V (vs. SCE), the increase of the reoxidation current of TI(0) to Tl(1) by nitrate is exploited for analytical purposes. Linearity between current and concentration exists for 0.5 to 60 pg . mL-' nitrate when applying anodic differential pulse voltammetry. Mechanical regeneration of the electrode surface is necessary after each measurement. The interference of other anions and the influence of methodical parameters are investigated. The applicability of this method for the determination of nitrate in drinking water is demonstrated. A concise overview on the electroanalytical techniques for the quantitative determination of nitrate is also presented.KEY WORDS Nitrate, Carbon paste, Modified electrodes catalysis.

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Section: Resultsmentioning

confidence: 65%

Voltammetric determination of nitrate with a modified carbon paste electrode

et al. 1994

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“…Of electrochemical methods polarography was frequently employed 3–12 mainly after converting nitrates to nitro derivatives of various organic compounds which produced well resolved polarographic waves. Neuhold et al.…”

Section: Introductionmentioning

confidence: 99%

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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“…The polarographic methods are based on the catalytic waves that result from the presence of V022+ (8), La3+ (9), Ce3+ (9), molybdate ion (10), Zr02+ (11), and chromium(III) complexes of glycine (12). The suppression of such catalytic activity by FeS04 also has been used for the determination of NO3- (13). Another approach has been to measure the polarographic reduction of 4-nitro-2,6-xylenol (14), which is formed by reaction of nitrate ion with 2,6-xylenol.…”

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confidence: 99%

Voltammetric determination of nitrate ion at parts-per-billion levels

Bodini¹,

Sawyer²

1977

Anal. Chem.

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A new voltammetric method for the determination of nitrate Ion at a pyrolytic graphite electrode has been developed. It is based on the electrocatalytic reduction of nitrate Ion which occurs at -1.0 V vs. SCE when copper metal and cadmium metal have been electrochemically deposited onto the surface of the working electrode. The presence of iron, chloride, and sulfate Ions, and of organic matter, does not interfere with the analysis, but nitrite ion is reduced at the same conditions. With the sample solution adjusted to contain 0.1 M NaH2P04, 10 µ CdCI2, and 50 µ CuCI2, linear calibration curves are obtained for the concentration range from 1 µ (62 ppb) to 1 mM (62

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Polarographic Determination of Nitrates in Sanitary Analysis

Cited by 22 publications

References 11 publications

Voltammetric determination of nitrate with a modified carbon paste electrode

Voltammetric determination of nitrate with a modified carbon paste electrode

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

Voltammetric determination of nitrate ion at parts-per-billion levels

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