Direct As(V) Determination Using Screen-Printed Electrodes Modified with Silver Manoparticles.

Area of Science:

• Electrochemistry
• Nanomaterials Science
• Environmental Analytical Chemistry

Background:

• Arsenic contamination in water poses significant health risks.
• Accurate and sensitive detection methods for As(V) are crucial for environmental monitoring.
• Screen-printed electrodes offer a portable and cost-effective platform for electrochemical analysis.

Purpose of the Study:

• To develop and evaluate carbon-nanofiber-based screen-printed electrodes modified with silver nanoparticles (Ag-NP-SPCNFEs) for the direct determination of As(V).
• To compare the analytical performance of electrodes modified with two different silver nanoparticle morphologies: nanoseeds (NS) and nanoprisms (NPr).
• To establish a sensitive and reproducible method for As(V) detection at low microgram per liter levels.

Main Methods:

• Fabrication and characterization of Ag-NP-SPCNFEs using microscopy and electrochemical techniques.
• Optimization of differential pulse anodic stripping voltammetry (DPASV) for direct As(V) determination.
• Comparative analysis of sensor performance using Ag-NS and Ag-NPr modified electrodes.

Main Results:

• Ag-NP-SPCNFEs enabled direct determination of As(V) at low μg L^-1 levels.
• Electrodes modified with silver nanoseeds (Ag-NS) exhibited a better analytical response than those modified with silver nanoprisms (Ag-NPr).
• The Ag-NS modified sensor achieved a detection limit of 0.6 μg L^-1 and a quantification limit of 1.9 μg L^-1.

Conclusions:

• Silver nanoseed-modified carbon-nanofiber screen-printed electrodes are effective for sensitive As(V) determination.
• The developed voltammetric method is reproducible and validated against ICP-MS, showing good agreement.
• This approach offers a promising tool for the on-site monitoring of arsenic in water samples.