Novel PVC-based membrane sensors selective for vanadyl ions

Area of Science:

• Electrochemistry
• Materials Science
• Analytical Chemistry

Background:

• Poly(vinyl chloride) (PVC) based membranes are widely used in ion-selective electrodes.
• Vanadium oxides are important industrial materials, necessitating accurate quantification methods.
• Developing selective sensors for metal ions is crucial for environmental and industrial monitoring.

Purpose of the Study:

• To prepare and investigate PVC-based membranes incorporating DEHPA and DBBP as VO(2+)-selective sensors.
• To evaluate the sensing performance, including response range, time, and selectivity.
• To demonstrate the practical application of these sensors for vanadium determination in real samples.

Main Methods:

• Fabrication of PVC membranes with DEHPA and DBBP, along with sodium tetraphenylborate as an anion excluder.
• Electrochemical characterization of the sensor response to VO(2+) ions across various concentrations.
• Testing sensor selectivity against common interfering cations.
• Application of the sensors in potentiometric titration for vanadium analysis.

Main Results:

• The developed membranes exhibited a near-Nernstian/Nernstian response for VO(2+) over a concentration range of approximately 10(-5) to 10(-1) M.
• Sensors demonstrated fast response times and excellent selectivity for VO(2+) over other tested cations.
• Successful quantitative determination of vanadium in waste V(2)O(5) catalyst was achieved.
• The sensors served effectively as indicator electrodes in potentiometric titrations of VO(2+) with EDTA.

Conclusions:

• PVC-based membranes incorporating DEHPA and DBBP are highly effective VO(2+)-selective sensors.
• These sensors offer a reliable and efficient method for vanadium quantification in industrial waste.
• The developed sensor technology holds promise for advanced analytical applications in potentiometry.