Screen-printed electrode modified with carbon black nanoparticles for phosphate detection by measuring the...

Area of Science:

• Electrochemistry
• Analytical Chemistry
• Materials Science

Background:

• Phosphate detection is crucial for environmental monitoring and water quality assessment.
• Existing methods may have limitations in sensitivity, cost, or complexity.
• Nanomaterials offer potential for enhanced electrochemical sensor performance.

Purpose of the Study:

• To develop and optimize a novel electrochemical sensor for phosphate detection.
• To utilize carbon black nanoparticles for improved sensor sensitivity and performance.
• To validate the sensor's applicability in real-world water samples.

Main Methods:

• Screen-printed electrodes modified with carbon black nanoparticles were fabricated.
• Amperometric detection was employed, measuring the electrochemical reduction of the molybdophosphate complex.
• Optimization of analytical parameters including working solution, applied potential, and molybdate concentration was performed.

Main Results:

• The sensor demonstrated quantification of the molybdophosphate complex at a low applied potential.
• Optimized conditions yielded a linear detection range of 0.5–100µM with a detection limit of 0.1µM.
• Satisfactory recovery values were obtained in drinking, river, aquarium, and wastewater samples.

Conclusions:

• The developed sensor shows high sensitivity and selectivity for phosphate detection.
• Carbon black nanoparticle modification enhances the electrochemical performance of screen-printed electrodes.
• The sensor is suitable for practical application in monitoring phosphate levels in diverse water matrices.