title: Simultaneous Voltammetric/Amperometric Determination of Sulfide and Nitrite in Water at BDD Electrode.
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.
authors.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.
authors.forename: Anamaria
authors.initials: A
authors.lastname: Baciu
authors.affiliation: 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.
authors.forename: Magdalena
authors.initials: M
authors.lastname: Ardelean
authors.affiliation: 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.
authors.forename: Aniela
authors.initials: A
authors.lastname: Pop
authors.affiliation: 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.
authors.forename: Rodica
authors.initials: R
authors.lastname: Pode
authors.affiliation: 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.
authors.forename: Florica
authors.initials: F
authors.lastname: Manea
keywords: boron-doped diamond electrode; multiple-pulsed amperometry; nitrite; simultaneous voltammetric/amperometric detection; square-wave voltammetry; sulfide