Abstract
We have developed a simple and selective method for the electrochemical detection of hydrazine (HZ) using poly(dopamine) (pDA)-modified indium tin oxide (ITO) electrodes. Modification with pDA was easily achieved by submerging the ITO electrode in a DA solution for 30 min. The electrocatalytic oxidation of HZ on the pDA-modified ITO electrode was measured by cyclic voltammetry. In buffer solution, the concentration range for linear HZ detection was 100 µM–10 mM, and the detection limit was 1 µM. The proposed method was finally used to determine HZ in tap water to simulate the analysis of real samples. This method showed good recovery (94%–115%) and was not affected by the other species present in the tap water samples.
Highlights
Hydrazine (HZ, N2 H4 ) is an inorganic compound that exists as a volatile and flammable colorless liquid
Various analytical methods such as titrimetry [3], chromatography [4], spectrophotometry [5], flow injection analysis with chemiluminescence [6], potentiometry [7], and amperometry [8,9,10,11] have been used for HZ detection
The electrochemical oxidation properties of HZ were examined on a bare indium tin oxide (ITO) electrode using
Summary
Hydrazine (HZ, N2 H4 ) is an inorganic compound that exists as a volatile and flammable colorless liquid. Formed on many substrates in basic solutions [32,33,34,35] To meet this requirement, in this study we adopted poly(dopamine) (pDA) to modify electrodes to Indium tinWe oxide areormainly used in display and because solar cell applications because detect HZ. Indium tin oxide electrodes aresensors mainly because used in display and solar cell applications because of their good electrical conductivity, optical property transparency, and electrodes low cost These arelower reproducibility [36,37]. Another characteristic of ITO is thatelectrodes they have applicable to electrochemical sensors because of their low background current and high catalytic activity than other metal (e.g., Pt, Au, and Pd) electrodes, which can suppress interfering reproducibility [36,37].during Another characteristic property of the ITOlow electrodes is activity that theyofhave electrochemical reactions measurements. Readily detected because of the electrochemical-chemical (EC) reaction on the pDA-ITO electrode
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