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Sampling, Sorting, and Characterizing Microplastics in Aquatic Environments with High Suspended Sediment Loads and Large Floating Debris
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Breakdown and Modification of Microplastic Beads by Aeolian Abrasion
Joanna E Bullard1, Zhaoxia Zhou2, Sam Davis2
1Geography and Environment, Loughborough University, Leicestershire LE11 3TU, U.K.
Environmental Science & Technology
|December 15, 2022
Summary
Wind erosion via saltation significantly breaks down microplastics, reducing their size by up to 50% and creating fragments small enough for long-distance transport and human respiration.
Area of Science:
- Environmental Science
- Geology
- Materials Science
Background:
- Aeolian abrasion during saltation modifies particles.
- Microplastic transport by wind is known, but its effect on microplastics is unstudied.
Purpose of the Study:
- Investigate the impact of simulated saltation on microplastic properties.
- Analyze changes in microplastic size, shape, and surface characteristics.
Main Methods:
- Simulated saltation experiments using microplastic beads and quartz grains.
- Abrasion over 240-300 hours.
- Analysis of microplastic size, shape, and surface composition.
Main Results:
- Microplastic diameter reduced by 30-50% with ~80% mass loss.
- Over 95% of removed fragments were ≤10 μm.
- Quartz particles adhered to microplastics, altering surface composition.
Conclusions:
- Aeolian saltation mechanically degrades microplastics.
- Small microplastic fragments (<10 μm) can travel long distances.
- These fragments pose risks for human respiration.
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