Flow Injection Amperometric Detection of Sulfide Using a Prussian Blue Modified Glassy Carbon Electrode

Abstract

This study investigates a new approach for the electrocatalytic determination of sulfide in a flow injection analysis (FIA) system using a Prussian blue modified glassy carbon electrode (PB/GCE). The results from experiments show that PB/GCE significantly enhances the electrocatalytic activity towards sulfide oxidation. A homemade flow electrochemical cell was used to perform the electrocatalytic determination of sulfide in the FIA system. The currents obtained from amperometric measurements in the FIA system at optimum conditions (carrier solution, pH 8.0; Britton-Robinson buffer solution containing 0.1 M KCl; flow rate, 1.4 mL/min; transmission tubing length, 10 cm; injection volume, 100 μL; constant applied potential, +150 mV vs. Ag/AgCl/KClsat) were linearly correlated with the sulfide concentration. A calibration curve was obtained for sulfide concentrations in the range of 0.5 -100 μM. The detection limit was found to be 0.3 μM for the amperometric method. The proposed method was successfully applied to wastewater sample. Finally, results from sulfide measurements by PB/GCE were in good agreement with those obtained from the spectrophotometric method.

Determination of Sulfide by Hematoxylin Multiwalled Carbon Nanotubes Modified Carbon Paste Electrode

“…The LOD of the proposed method was lower than that of almost all the previous studies mentioned in Table 2. In addition, the preparation of the proposed electrode is simpler and easier than those compared 13, 17, 19, 20. The HM‐MWCNTs/CPE can be applied for the flow injection analysis system, while the pencil graphite modified with hematoxylin 34 may have difficulties for this purpose.…”

Pyrocatechol Violet Modified Graphite Pencil Electrode for Flow Injection Amperometric Determination of Sulfide

“…have been used for the electrocatalytic oxidation of sulfide [22][23][24][25][26][27][28][29][30][31][32][33][34]. It can be said that amperometric [23][24][25][26][27][28][29][30][31], voltammetric [32][33][34] and potentiometric methods [35] have been successfully developed for the electrochemical determination of sulfide. However, our search of the literature shows that Pcv used as an efficient electrocatalyst for many compounds has so far not been used for the electrocatalytic oxidation of sulfide.…”

The Mediatorless Electroanalytical Sensing of Sulfide Utilizing Unmodified Graphitic Electrode Materials

“…Current methods for the detection of sulfide usually rely upon colorimetric measurements (i.e., zinc trap/methylene blue test) or a visual color coded detection using a paper strip [1]. Although there are several methods reported within the literature for the analytical sensing of sulfide (within aqueous media) such as chromatography, mass spectrometry, fluorescent and chemiluminescent techniques [2][3][4][5][6][7], electroanalytical techniques can provide potentially sensitive, portable and low cost alternatives [8][9][10][11][12][13].…”