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Sensors 2015, 15(6), 14526-14538; doi:10.3390/s150614526

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

Department of Applied Chemistry and Engineering of Inorganic Compounds and Environment, Politehnica University of Timisoara, V. Parvan no. 6, Timișoara 300223, Romania
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Author to whom correspondence should be addressed.
Academic Editor: W. Rudolf Seitz
Received: 8 April 2015 / Accepted: 22 May 2015 / Published: 19 June 2015
(This article belongs to the Section Chemical Sensors)
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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. View Full-Text
Keywords: simultaneous voltammetric/amperometric detection; nitrite; sulfide; boron-doped diamond electrode; square-wave voltammetry; multiple-pulsed amperometry simultaneous voltammetric/amperometric detection; nitrite; sulfide; boron-doped diamond electrode; square-wave voltammetry; multiple-pulsed amperometry
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Baciu, A.; Ardelean, M.; Pop, A.; Pode, R.; Manea, F. Simultaneous Voltammetric/Amperometric Determination of Sulfide and Nitrite in Water at BDD Electrode. Sensors 2015, 15, 14526-14538.

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