A fluorometric paper-based sensor array for the discrimination of heavy-metal ions

Area of Science:

• Analytical Chemistry
• Environmental Science
• Materials Science

Background:

• Heavy-metal ion contamination in wastewater poses significant environmental and health risks.
• Accurate and sensitive detection methods are crucial for monitoring wastewater discharge.
• Existing methods can be complex, time-consuming, or require specialized equipment.

Purpose of the Study:

• To develop a sensitive and convenient fluorometric paper-based sensor array.
• To enable the discrimination and determination of seven heavy-metal ions at wastewater discharge standard concentrations.
• To explore the feasibility of the sensor array for real-world sample analysis.

Main Methods:

• Development of a fluorometric paper-based sensor array utilizing nine cross-reactive BODIPY fluorescent indicators.
• Immobilization of indicators and enrichment of analytes on the paper substrate.
• Application of array technologies-based pattern recognition and chemometric analysis for ion identification.
• Semi-quantitative estimation through colorimetric comparison with known concentrations.

Main Results:

• Successful discrimination of seven different heavy-metal ions at wastewater discharge standard concentrations.
• Achieved high sensitivity with clear differentiation down to 10(-7)M concentrations.
• Demonstrated semi-quantitative estimation capabilities based on color changes.
• Preliminary investigation showed feasibility in spiked tap water and seawater samples.

Conclusions:

• The developed fluorometric paper-based sensor array offers a sensitive, convenient, and effective tool for heavy-metal ion detection in wastewater.
• The combination of fluorescent indicators, array technology, and chemometrics enables reliable identification and differentiation of multiple heavy metals.
• The sensor array shows potential for practical application in environmental monitoring and water quality assessment.