Microplastic Release from Single-Use Plastic Beverage Cups.

Area of Science:

• Environmental Science
• Food Safety
• Materials Science

Background:

• Microplastics (MPs) are emerging food and drink contaminants.
• Single-use disposable cups are suspected sources of MPs in beverages.

Purpose of the Study:

• To investigate MP release from four disposable cup materials (PP, PS, PE-coated paper, EPS) under varying temperatures and times.
• To assess the impact of pre-washing on MP release.
• To evaluate surface changes on cups after hot water exposure.

Main Methods:

• Cups were exposed to water at 4°C, 50°C, and 80°C for 0, 5, 10, and 20 minutes.
• MP counts were quantified.
• Scanning Electron Microscopy (SEM) and Fourier-Transform Infrared Spectroscopy (FTIR) were used to analyze cup surfaces.

Main Results:

• MP release ranged from 126 to 1420 particles/L.
• Polypropylene (PP) cups at 50°C for 20 minutes showed the highest release; PE-coated paper cups at 4°C for 0 minutes showed the lowest.
• Pre-washing reduced MP release by 52-65%.
• SEM and FTIR indicated surface abrasion due to hot water exposure.

Conclusions:

• Single-use cups are a significant source of microplastic contamination in beverages.
• Temperature and exposure time influence MP release.
• Pre-washing and material choice can mitigate MP transfer.
• Estimated annual MP exposure from beverages in disposable cups is substantial (18,720-73,840).