A novel method for iodate determination using cadmium sulfide quantum dots as fluorescence probes

Area of Science:

• Analytical Chemistry
• Materials Science
• Nanotechnology

Background:

• Accurate determination of iodate is crucial for nutritional iodine content assessment.
• Existing methods for iodate detection can be complex or lack sensitivity.
• Quantum dots offer unique optical properties for sensitive chemical sensing applications.

Purpose of the Study:

• To develop a novel, sensitive, and reliable method for iodate determination.
• To utilize carboxymethyl cellulose-capped cadmium sulfide quantum dots (CdS QDs) as fluorescent probes.
• To apply the developed method for analyzing iodate and total iodine in real-world samples like table salt.

Main Methods:

• Synthesis and characterization of carboxymethyl cellulose-capped CdS QDs.
• Investigation of factors influencing fluorescence quenching by iodate.
• Optimization of reaction conditions for maximum sensitivity and selectivity.
• Indirect detection of iodide through oxidation to iodate.
• Application of the method to table salt samples.

Main Results:

• A linear relationship was observed between relative fluorescence intensity and iodate concentration (1.0 × 10⁻⁸ to 1.0 × 10⁻⁵ mol L⁻¹).
• A low detection limit of 6.0 nmol L⁻¹ was achieved with a high correlation coefficient (0.9987).
• The method demonstrated successful application in determining iodate and total iodine in table salt.

Conclusions:

• Carboxymethyl cellulose-capped CdS QDs provide a sensitive platform for iodate detection.
• The developed method is effective for the analysis of iodate and total iodine in food samples.
• This approach offers a promising alternative for routine iodine content analysis.