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

Anamaria Baciu; Magdalena Ardelean; Aniela Pop; Rodica Pode; Florica Manea

doi:10.3390/s150614526

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

Sensors (Basel). 2015 Jun 19;15(6):14526-38. doi: 10.3390/s150614526.

Authors

Anamaria Baciu¹, Magdalena Ardelean², Aniela Pop³, Rodica Pode⁴, Florica Manea⁵

Affiliations

¹ 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.
² Department of Applied Chemistry and Engineering of Inorganic Compounds and Environment, Politehnica University of Timisoara, V. Parvan no. 6, Timișoara 300223, Romania. magdalena.ardelean@upt.ro.
³ Department of Applied Chemistry and Engineering of Inorganic Compounds and Environment, Politehnica University of Timisoara, V. Parvan no. 6, Timișoara 300223, Romania. aniela.pop@upt.ro.
⁴ Department of Applied Chemistry and Engineering of Inorganic Compounds and Environment, Politehnica University of Timisoara, V. Parvan no. 6, Timișoara 300223, Romania. rodica.pode@upt.ro.
⁵ Department of Applied Chemistry and Engineering of Inorganic Compounds and Environment, Politehnica University of Timisoara, V. Parvan no. 6, Timișoara 300223, Romania. florica.manea@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.

Keywords: boron-doped diamond electrode; multiple-pulsed amperometry; nitrite; simultaneous voltammetric/amperometric detection; square-wave voltammetry; sulfide.