Preparation and properties of a new solid state borate ion selective electrode and its application

Area of Science:

• Analytical Chemistry
• Electrochemistry
• Materials Science

Background:

• Accurate borate ion detection is crucial for environmental monitoring and industrial process control.
• Existing methods for borate determination can be complex or lack sensitivity.
• Development of selective and stable ion-selective electrodes (ISEs) is an ongoing area of research.

Purpose of the Study:

• To develop and characterize a new solid-state borate ion-selective electrode (ISE).
• To evaluate the electrode's performance, including its working parameters, selectivity, and operational lifetime.
• To assess the practical applicability of the developed ISE for determining borate concentrations in real-world water samples.

Main Methods:

• Fabrication of a borate ISE using a mixture of silver(I) borate (Ag(3)BO(3)), silver(I) sulfide (Ag(2)S), and copper(I) sulfide (Cu(2)S) as the sensing material.
• Optimization of electrode composition, working pH range, and conditioning procedures.
• Potentiometric measurements to determine the electrode's linear response range, slope, and selectivity against common interfering ions.
• Testing the electrode's stability, response time, and lifetime under practical conditions.
• Analysis of borate content in industrial wastewater and tap water samples, with validation using differential pulse polarography.

Main Results:

• The developed borate ISE exhibited a useful potential change over a wide concentration range (1x10(-6) to 1x10(-1) M borate).
• A consistent slope of 31±2 mV/decade was achieved, indicating good sensitivity.
• The electrode demonstrated excellent selectivity, with only silver(I) ions showing a minor interference effect.
• The ISE showed remarkable long-term stability, with a lifetime exceeding two years under regular usage.
• Response times were rapid, typically within 20-30 seconds.
• Analysis of real water samples showed high consistency when compared to differential pulse polarography.

Conclusions:

• The newly developed solid-state borate ion-selective electrode is a reliable and stable tool for borate determination.
• Its wide detection range, good selectivity, and long lifetime make it suitable for environmental and industrial applications.
• The electrode provides a practical and efficient alternative for monitoring borate levels in various water matrices.