Real-World Implementation of Particle-Based Microfluidics: On-Spot Test for Iron and Copper Ions in Water

Area of Science:

• Analytical Chemistry
• Microfluidics
• Environmental Science

Background:

• Water quality monitoring is crucial for public health and industries like agriculture.
• Traditional laboratory analysis is time-consuming and expensive.
• There is a need for rapid, cost-effective, and user-friendly on-site water testing solutions.

Purpose of the Study:

• To develop a novel particle-based microfluidic test for quantitative on-site analysis of iron and copper ions.
• To demonstrate the first application of particle-based microfluidics in a self-contained test for real-world samples.
• To validate the test's performance against accredited laboratory methods.

Main Methods:

• Development of a particle-based microfluidic device with sequentially placed immobile colorimetric reagents.
• Utilizing analyte concentration through reagent interaction within the microfluidic channels.
• Quantification of iron and copper ions using a portable flatbed scanner.
• Cross-validation with accredited laboratory methods using diverse water samples.

Main Results:

• The developed test provides quantitative analysis for iron and copper ions with a working range of 0.05 to 5 ppm.
• Achieved detection limits of 38 ppb for copper and 10 ppb for iron.
• Successfully demonstrated applicability to complex samples containing chelating agents, including tap water and hydroponic nutrient solutions.
• Analysis requires less than one minute of hands-on time and minimal expertise.

Conclusions:

• The novel particle-based microfluidic test offers a reliable, rapid, and user-friendly on-site solution for water quality monitoring.
• This technology is suitable for diverse applications, including drinking water assessment and agricultural nutrient management.
• The successful demonstration with complex samples containing chelating agents represents a significant advancement in portable water analysis.