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A comparative study on PVC based sensors in determination of.
Vinod K Gupta1,2, Ajay K Jain1, Manoj K Pal1
1Department of Chemistry, Indian Institute of Technology Roorkee, Roorkee, 247 667, India. vinodfcy@gmail.com.
Analytical Methods : Advancing Methods and Applications
|September 17, 2020
Summary
New PVC-based membrane sensors were developed for molybdenum(V) determination. Sensor 7, utilizing ionophore S3, demonstrated excellent performance, a wide working range, and applicability to natural samples.
Area of Science:
- Analytical Chemistry
- Electrochemistry
- Materials Science
Background:
- Ion-selective electrodes (ISEs) are crucial for metal ion detection.
- Developing selective and sensitive sensors for molybdenum(V) remains an area of active research.
- Polyvinyl chloride (PVC)-based membranes offer a versatile platform for sensor fabrication.
Purpose of the Study:
- To synthesize and characterize novel neutral ionophores for selective molybdenum(V) detection.
- To develop and optimize PVC-based membrane sensors for the determination of molybdenum(V).
- To evaluate the performance of the developed sensors in complex matrices and compare with established analytical techniques.
Main Methods:
- Synthesis of three neutral ionophores: S1, S2, and S3.
- Fabrication of PVC-based membrane sensors incorporating the synthesized ionophores.
- Electrochemical characterization including potentiometric measurements to determine working range, detection limit, and slope.
- Testing sensor performance in the presence of interfering ions and non-aqueous media.
- Application of the optimized sensor for molybdenum(V) determination in natural samples (water, soil, urine).
- Comparative analysis with Electrothermal Atomic Absorption Spectrometry (ETAAS) and spectrophotometric methods.
Main Results:
- Sensor 7, based on ionophore S3, exhibited optimal performance with a working range of 2.3 × 10⁻⁷ to 1.0 × 10⁻² M and a detection limit of 1.2 × 10⁻⁷ M.
- The sensor demonstrated a favorable slope of 11.7 mV/decade and tolerated up to 15% non-aqueous media.
- Sensor 7 showed good selectivity and was successfully applied to determine molybdenum(V) in various natural samples.
- The sensor maintained performance for 2.5 months before ionophore leaching was observed.
- A rapid response time of 11 seconds was recorded for the optimized sensor.
Conclusions:
- Ionophore S3 is highly effective for the development of sensitive and selective PVC-based membrane sensors for molybdenum(V).
- The developed sensor offers a reliable and cost-effective method for molybdenum(V) determination in diverse sample types.
- The sensor's performance is comparable to established techniques like ETAAS, highlighting its practical utility.
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