Journal
SENSORS
Volume 15, Issue 6, Pages 14526-14538Publisher
MDPI
DOI: 10.3390/s150614526
Keywords
simultaneous voltammetric/amperometric detection; nitrite; sulfide; boron-doped diamond electrode; square-wave voltammetry; multiple-pulsed amperometry
Funding
- Romanian National Authority for Scientific Research
- CNCS-UEFISCDI [PN-II-ID-165/2011]
- Ministry of National Education, Romania [POSDRU/159/1.5/S/137070]
- European Social Fund-Investing in People, within the Sectorial Operational Program Human Resources Development
- [PNII-PCCA-60/2012]
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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.
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