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Sodium-Alginate-Functionalized Silver Nanoparticles for Colorimetric Detection of Dimethoate.
Feng-Zuo Zhou1, Yung-Hsiang Chang2, Cho-Chun Hu1
1Department of Applied Science, National Taitung University, Taitung 950309, Taiwan.
Sodium alginate functionalized silver nanoparticles (SA-AgNPs) offer a rapid, visual method for detecting the pesticide dimethoate. This colorimetric sensor demonstrates high sensitivity and selectivity in real water samples.
Area of Science:
- Nanomaterials Science
- Analytical Chemistry
- Environmental Science
Background:
- Silver nanoparticles (AgNPs) are widely used in sensing applications due to their unique optical properties.
- Functionalization of AgNPs is crucial for enhancing their stability and selectivity in complex matrices.
- Dimethoate is a widely used organophosphate pesticide that poses environmental and health risks.
Purpose of the Study:
- To develop a sodium alginate-functionalized silver nanoparticle (SA-AgNPs) system for the colorimetric detection of dimethoate.
- To characterize the synthesized SA-AgNPs and evaluate their stability under various conditions.
- To establish a sensitive, selective, and rapid visual sensing method for dimethoate in water samples.
Main Methods:
- Synthesis and characterization of SA-AgNPs using UV-Vis spectrophotometry, FTIR, TEM, XPS, and zeta potential measurements.
- Investigation of SA-AgNPs stability concerning pH, salinity, and storage duration.
- Development of a colorimetric assay based on the aggregation-induced change in the absorption ratio (A475/A400) of SA-AgNPs upon dimethoate interaction.
Main Results:
- Spherical SA-AgNPs with an average size of 14.6 nm were successfully synthesized and characterized.
- The SA-AgNPs exhibited good stability across different pH, salinity, and storage conditions.
- A linear relationship was observed between the absorption ratio (A475/A400) and dimethoate concentration (0.05–2.0 ppm, R² = 0.9986) with a low limit of detection (30 ppb).
- The developed sensor showed high selectivity, with minimal interference from other pesticides, and was successfully applied to real water samples.
Conclusions:
- SA-AgNPs provide a stable and effective platform for the colorimetric sensing of dimethoate.
- The developed assay offers a rapid, sensitive, and selective method for dimethoate detection.
- This SA-AgNPs-based sensor holds promise for environmental monitoring and food safety applications.
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