Trap-Based Microfluidic Device with Retrievable Droplet for the Analysis of Pollutants from Slurry Solutions

Area of Science:

• Analytical Chemistry
• Microfluidics
• Sample Preparation

Background:

• Liquid-liquid microextraction (LLME) is a valuable technique for trace analyte analysis.
• A key limitation of LLME is the requirement for sample pretreatment to remove solids, risking analyte loss.
• Existing methods struggle with complex matrices containing particulate matter.

Purpose of the Study:

• To develop a microfluidic device for direct LLME from slurry solutions.
• To eliminate the need for pre-extraction solid removal steps.
• To demonstrate efficient and simplified trace analyte extraction from challenging samples.

Main Methods:

• A trap-based microfluidic device with a retrievable 1-Octanol extractant was designed.
• The device facilitates direct contact between sample solution and extractant in a microchannel.
• Nile red was used as a model analyte to optimize extraction parameters (concentration, flow rate).

Main Results:

• The microfluidic device enabled direct microextraction from slurry solutions without prior solid removal.
• Successful extraction of perfluorooctanoic acid (PFOA) from water was demonstrated.
• Trace amounts of carbamazepine (CBZ) were extracted from a concentrated sand suspension and analyzed via HPLC.

Conclusions:

• The developed microfluidic device offers a one-step solution for LLME from samples containing solids.
• This approach simplifies sample preparation, reduces analyte loss, and enhances analytical efficiency.
• The technology holds potential for applications in drug detection, environmental monitoring, and food safety analysis.