Electrochemical Simultaneous Detection of Salicylic Acid and Indole-3-Acetic Acid Using Graphitic Carbon Nitride
Abstract
precise, and simultaneous determination of these two hormones is of profound significance in plant science research and agricultural product
quality control. In this work, graphitic carbon nitride (gC3N4) was synthesized via direct calcination of melamine, and further employed as a
modifying agent to fabricate a glassy carbon electrode (GCE)based electrochemical sensor for the highly sensitive simultaneous detection of
SA and IAA. The morphology, crystal structure, and surface chemical composition of the asprepared gC3N4 were systematically characterized
by scanning electron microscopy, Xray diffraction, Raman spectroscopy, and Xray photoelectron spectroscopy. Electrochemical behaviors,
electrocatalytic response characteristics, and key testing parameters were thoroughly investigated using cyclic voltammetry, electrochemical
impedance spectroscopy, differential pulse voltammetry, and amperometric i–t measurements.
The results demonstrated that the obtained gC3N4 featured a wellordered layered structure with abundant nitrogenactive sites, which
remarkably boosted the electrocatalytic activity toward IAA and SA oxidation and enabled interferencefree simultaneous quantification at
wellseparated potentials. Under optimized conditions, the sensor displayed two linear ranges for IAA from 1.0 to 10 μmol·L-¹ and 50 to 1000
μmol·L-¹, with a limit of detection (LOD, S/N = 3) of 0.33 μmol·L-¹. For SA, a linear range of 0.5–1000 μmol·L-¹ was obtained with an LOD
of 0.167 μmol·L-¹. When applied to real plant sample analysis, the proposed method exhibited satisfactory spiked recoveries and reliable results. Featuring green preparation, low cost, easy operation, and high sensitivity, this work provides a novel electrochemical strategy for onsite rapid detection of phytohormones.
Keywords
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DOI: http://dx.doi.org/10.70711/frim.v4i7.9841
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