Copper(II)-selective electrode using 2,2'-dithiodianiline as neutral carrier

Area of Science:

• Electrochemistry
• Analytical Chemistry
• Materials Science

Background:

• Accurate detection of copper(II) ions is crucial in environmental monitoring and biological systems.
• Existing copper ion sensors often suffer from poor selectivity and interference from other metal ions.
• Development of novel ion-selective electrodes (ISEs) is essential for improved analytical performance.

Purpose of the Study:

• To develop a highly selective and sensitive poly(vinyl chloride) (PVC) membrane electrode for Cu(II) ion detection.
• To evaluate the potentiometric performance and selectivity of the developed electrode.
• To assess the long-term stability and interference effects on the Cu(II) sensor.

Main Methods:

• Fabrication of a PVC membrane electrode using 2,2'-dithiodianiline as a carrier and dibutyl phthalate as a plasticizer.
• Potentiometric measurements to determine the electrode's response to Cu(II) ions over a wide concentration range.
• Selectivity testing against various alkali, alkaline earth, transition, and heavy metal ions, including known interfering ions like Pb(2+), Cd(2+), and Fe(2+).

Main Results:

• The developed electrode demonstrated a Nernstian slope of 30±1 mV per decade for Cu(II) detection.
• A wide linear concentration range from 5.0x10(-2) to 7.0x10(-7) mol L(-1) was achieved.
• The electrode exhibited excellent selectivity for Cu(2+) ions, with no significant interference from common interfering ions, and maintained performance for one month.

Conclusions:

• The novel PVC membrane electrode incorporating 2,2'-dithiodianiline offers a robust and selective method for Cu(II) ion determination.
• The sensor's high sensitivity, wide linear range, rapid response time, and excellent selectivity make it suitable for practical applications.
• This development provides a valuable tool for accurate copper ion analysis in complex matrices, overcoming limitations of existing sensors.