Limits...
Simultaneous Voltammetric/Amperometric Determination of Sulfide and Nitrite in Water at BDD Electrode.

Baciu A, Ardelean M, Pop A, Pode R, Manea F - Sensors (Basel) (2015)

Bottom Line: Square-wave voltammetry operated under the optimized working conditions of 0.01 V step potential, 0.5 V modulation amplitude and 10 Hz frequency allowed achieving the best electroanalytical parameters for the simultaneous detection of nitrite and sulfide.Good accuracy was found for this protocol in comparison with standardized methods for each anion.Also, no interference effect was found for the cation and anion species, which are common in the water matrix.

View Article: PubMed Central - PubMed

Affiliation: Department of Applied Chemistry and Engineering of Inorganic Compounds and Environment, Politehnica University of Timisoara, V. Parvan no. 6, Timișoara 300223, Romania. anamaria.baciu@upt.ro.

ABSTRACT
This work reported new voltammetric/amperometric-based protocols using a commercial boron-doped diamond (BDD) electrode for simple and fast simultaneous detection of sulfide and nitrite from water. Square-wave voltammetry operated under the optimized working conditions of 0.01 V step potential, 0.5 V modulation amplitude and 10 Hz frequency allowed achieving the best electroanalytical parameters for the simultaneous detection of nitrite and sulfide. For practical in-field detection applications, the multiple-pulsed amperometry technique was operated under optimized conditions, i.e., -0.5 V/SCE for a duration of 0.3 s as conditioning step, +0.85 V/SCE for a duration of 3 s that assure the sulfide oxidation and +1.25 V/SCE for a duration of 0.3 s, where the nitrite oxidation occurred, which allowed the simultaneously detection of sulfide and nitrite without interference between them. Good accuracy was found for this protocol in comparison with standardized methods for each anion. Also, no interference effect was found for the cation and anion species, which are common in the water matrix.

No MeSH data available.


(a) Multiple-pulsed amperograms recorded at a BDD electrode in 0.1 M Na2SO4 supporting electrolyte and adding continuously a mixture of 0.02 mM NO2− and 0.02 mM S2−, recorded at E1 = −0.5 V/SCE, E2 = +0.85 V/SCE, E3 = +1.25 V/SCE; (b) Calibration plot of the current vs. anion concentration recorded at: E2 = +0.85 V/SCE vs. sulfide concentration and E3 = +1.3 V/SCE vs. nitrite concentration.
© Copyright Policy
Related In: Results  -  Collection

License
getmorefigures.php?uid=PMC4507588&req=5

sensors-15-14526-f007: (a) Multiple-pulsed amperograms recorded at a BDD electrode in 0.1 M Na2SO4 supporting electrolyte and adding continuously a mixture of 0.02 mM NO2− and 0.02 mM S2−, recorded at E1 = −0.5 V/SCE, E2 = +0.85 V/SCE, E3 = +1.25 V/SCE; (b) Calibration plot of the current vs. anion concentration recorded at: E2 = +0.85 V/SCE vs. sulfide concentration and E3 = +1.3 V/SCE vs. nitrite concentration.

Mentions: This detection scheme was also applied for the simultaneous amperometric detection of both anions in their mixtures and the results were reproducible (Figure 7). Based on these results, it can be concluded that the simultaneous detection of sulfide and nitrite without interference with each other to other was achieved using a three levels-MPA detection procedure for which the pulses were applied continuously based on the following scheme:(a)


Simultaneous Voltammetric/Amperometric Determination of Sulfide and Nitrite in Water at BDD Electrode.

Baciu A, Ardelean M, Pop A, Pode R, Manea F - Sensors (Basel) (2015)

(a) Multiple-pulsed amperograms recorded at a BDD electrode in 0.1 M Na2SO4 supporting electrolyte and adding continuously a mixture of 0.02 mM NO2− and 0.02 mM S2−, recorded at E1 = −0.5 V/SCE, E2 = +0.85 V/SCE, E3 = +1.25 V/SCE; (b) Calibration plot of the current vs. anion concentration recorded at: E2 = +0.85 V/SCE vs. sulfide concentration and E3 = +1.3 V/SCE vs. nitrite concentration.
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4507588&req=5

sensors-15-14526-f007: (a) Multiple-pulsed amperograms recorded at a BDD electrode in 0.1 M Na2SO4 supporting electrolyte and adding continuously a mixture of 0.02 mM NO2− and 0.02 mM S2−, recorded at E1 = −0.5 V/SCE, E2 = +0.85 V/SCE, E3 = +1.25 V/SCE; (b) Calibration plot of the current vs. anion concentration recorded at: E2 = +0.85 V/SCE vs. sulfide concentration and E3 = +1.3 V/SCE vs. nitrite concentration.
Mentions: This detection scheme was also applied for the simultaneous amperometric detection of both anions in their mixtures and the results were reproducible (Figure 7). Based on these results, it can be concluded that the simultaneous detection of sulfide and nitrite without interference with each other to other was achieved using a three levels-MPA detection procedure for which the pulses were applied continuously based on the following scheme:(a)

Bottom Line: Square-wave voltammetry operated under the optimized working conditions of 0.01 V step potential, 0.5 V modulation amplitude and 10 Hz frequency allowed achieving the best electroanalytical parameters for the simultaneous detection of nitrite and sulfide.Good accuracy was found for this protocol in comparison with standardized methods for each anion.Also, no interference effect was found for the cation and anion species, which are common in the water matrix.

View Article: PubMed Central - PubMed

Affiliation: Department of Applied Chemistry and Engineering of Inorganic Compounds and Environment, Politehnica University of Timisoara, V. Parvan no. 6, Timișoara 300223, Romania. anamaria.baciu@upt.ro.

ABSTRACT
This work reported new voltammetric/amperometric-based protocols using a commercial boron-doped diamond (BDD) electrode for simple and fast simultaneous detection of sulfide and nitrite from water. Square-wave voltammetry operated under the optimized working conditions of 0.01 V step potential, 0.5 V modulation amplitude and 10 Hz frequency allowed achieving the best electroanalytical parameters for the simultaneous detection of nitrite and sulfide. For practical in-field detection applications, the multiple-pulsed amperometry technique was operated under optimized conditions, i.e., -0.5 V/SCE for a duration of 0.3 s as conditioning step, +0.85 V/SCE for a duration of 3 s that assure the sulfide oxidation and +1.25 V/SCE for a duration of 0.3 s, where the nitrite oxidation occurred, which allowed the simultaneously detection of sulfide and nitrite without interference between them. Good accuracy was found for this protocol in comparison with standardized methods for each anion. Also, no interference effect was found for the cation and anion species, which are common in the water matrix.

No MeSH data available.