Carbon composite-PVC based membrane coated platinum electrode for chromium determination

Area of Science:

• Electrochemistry
• Analytical Chemistry
• Materials Science

Background:

• Chromium(III) detection is crucial in environmental and biological monitoring.
• Development of selective and sensitive sensors is essential for accurate chromium analysis.
• Ion-selective electrodes (ISEs) offer a promising platform for metal ion sensing.

Purpose of the Study:

• To synthesize a novel ionophore for chromium(III) detection.
• To fabricate and characterize a chromium(III)-selective sensor using the synthesized ionophore.
• To evaluate the sensor's performance, including linearity, detection limit, response time, stability, and selectivity.

Main Methods:

• Synthesis of 1-(2-(1H-imidazole-1-yl)-1-(4-methoxyphenyl)ethylidene)-2-phenyl hydrazine as an ionophore.
• Fabrication of a carbon composite-PVC coated platinum electrode incorporating the ionophore.
• Homogenization of the membrane mixture using ultrasound.
• Potentiometric measurements to determine sensor performance characteristics.

Main Results:

• The sensor exhibited a Nernstian slope of 19.62 ± 0.45 mV decade(-1).
• A wide linear concentration range (8.4 × 10(-8)-1.0 × 10(-2)M) and a low detection limit (6.8 × 10(-8)M) for Cr(NO(3))(3) were achieved.
• The electrode demonstrated a short response time (10s), good reproducibility, stability for at least 2 months, and pH independence (3.3-5.9).
• The sensor showed excellent selectivity against various metal ions and was successfully applied in real samples.

Conclusions:

• The developed chromium(III)-selective sensor based on the novel ionophore is highly effective.
• The sensor offers superior analytical performance, including sensitivity, selectivity, and stability.
• The proposed electrode is suitable for the quantitative determination of chromium(III) in complex matrices and as an indicator electrode in titrations.