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Silver(I)-selective electrode based on [Bz2Oxo4(18)dieneS4] tetrathia macrocyclic carrier
Ashok Kumar Singh1, Puja Saxena
1Department of Chemistry, Indian Institute of Technology-Roorkee, Roorkee 247 667, India. akscyfcy@iitr.ernet.in
A novel silver ion sensor was developed using a polystyrene-based membrane with a specific ionophore. This sensor offers a wide linear range, fast response, and excellent selectivity for silver ion detection.
Area of Science:
- Electrochemistry
- Materials Science
- Analytical Chemistry
Background:
- Development of selective ion-sensors is crucial for environmental monitoring and industrial processes.
- Polystyrene-based membranes offer a versatile platform for sensor fabrication.
- Macrocyclic compounds are effective ionophores for selective ion recognition.
Purpose of the Study:
- To fabricate and characterize a potentiometric sensor for silver ion (Ag+) detection.
- To evaluate the sensor's performance in terms of linearity, sensitivity, selectivity, and stability.
- To assess the sensor's applicability in real-world samples, including industrial waste.
Main Methods:
- Fabrication of a polystyrene-based membrane incorporating 7,8:16,17-dibenzo-6,9,15,18-tetraoxo-1,5,10,14-tetrathiacyclooctadeca-7,16-diene [Bz2Oxo4(18)dieneS4] as the ionophore.
- Optimization of membrane composition using sodium tetraphenylborate (NaTPB) as an anion excluder and dioctyl phthalate (DOP) as a plasticizer.
- Potentiometric measurements to determine the sensor's response characteristics, including linear range, slope, detection limit, and selectivity.
Main Results:
- The optimized membrane composition (ionophore:polystyrene:DOP:NaTPB, 5:100:150:10 w/w) exhibited a linear response for Ag+ over a wide concentration range (1.26 x 10(-6) - 1.00 x 10(-1) mol L(-1)).
- The sensor achieved a Nernstian slope of 58.4 ± 0.1 mV/decade with a detection limit of 1.0 x 10(-6) mol L(-1).
- The electrode demonstrated good chemical inertness, stability for 3 months, a rapid response time of 10 s, and satisfactory performance in up to 35% non-aqueous media.
Conclusions:
- The developed membrane sensor exhibits excellent performance characteristics for selective and sensitive detection of silver ions.
- The sensor demonstrates robust stability and a wide operational range, making it suitable for practical applications.
- The sensor was successfully applied in potentiometric titrations and for determining silver ions in photographic film waste, highlighting its utility in environmental analysis.
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