Small scale and high impact: the leaching of hazardous elements from glitters

Area of Science:

• Environmental Chemistry
• Materials Science
• Ecotoxicology

Background:

• Microplastic pollution is a growing global concern, leading to restrictions on glitter use.
• Previous research focused on the physical hazards of glitter particles.
• The chemical composition and potential toxic element release from glitter remain under-investigated.

Purpose of the Study:

• To investigate the release of potentially toxic elements (PTEs) from the colored and reflective layers of both plastic and natural glitters.
• To evaluate the leaching behavior of these elements under various environmental conditions.
• To assess the environmental safety of natural glitter alternatives.

Main Methods:

• Characterization of natural and plastic glitters (structure, coloration).
• Quantification of PTEs content in glitter samples.
• Leaching experiments using model solutions simulating environmental conditions (acidic, hydrophobic).

Main Results:

• Colored and reflective glitter layers showed high concentrations of Al, Cu, Cr, and Ni.
• Natural glitter contained significant amounts of Al and Pb.
• Metal mobilization was highest under acidic and hydrophobic conditions, with over 90% leaching for Cr, Cu, and Ni.
• Natural alternatives were not necessarily safer than plastic glitter.

Conclusions:

• Glitter's small size, irregular shape, and metal-releasing properties pose environmental risks.
• Both plastic and natural glitters can contribute to toxic metal contamination in ecosystems.
• Environmental assessments of glitter should include chemical risks, not solely physical impacts.