Nanoplastic Sample Cleanup by Micro-Electromembrane Extraction across Free Liquid Membranes

Area of Science:

• Environmental Science
• Analytical Chemistry
• Materials Science

Background:

• Nanoplastic contamination poses a significant environmental challenge.
• Effective sample preparation for nanoplastic analysis in complex matrices remains limited.
• Existing methods often struggle with efficient separation and cleanup.

Purpose of the Study:

• To introduce and validate micro-electromembrane extraction (μ-EME) for nanoplastic separation and cleanup.
• To demonstrate the efficiency of μ-EME in removing interfering substances from sample matrices.
• To quantify nanoplastic recovery using μ-EME coupled with capillary electrophoresis.

Main Methods:

• Utilized micro-electromembrane extraction (μ-EME) with a free liquid membrane (FLM).
• Employed sulfonated polystyrene beads (200 nm) as model nanoplastics.
• Analyzed nanoplastics using capillary electrophoresis with diode array detection post-extraction.

Main Results:

• Achieved rapid nanoplastic sample cleanup in 90 seconds.
• Obtained a 60% nanoplastic transfer yield through the FLM with <9% RSD.
• Demonstrated efficient matrix cleanup in real samples like black and flavored teas (56% and 47% yield, respectively).

Conclusions:

• μ-EME is a highly effective technique for rapid nanoplastic separation and matrix cleanup.
• The method shows promise for analyzing nanoplastics in diverse and complex environmental samples.
• μ-EME offers a significant advancement in sample preparation for nanoplastic quantification.