Table 1 The sample (filter) numbers in which AMP was detected, the types of plastic polymers detected by micro-Raman spectroscopy and their density, diameters, and calculated equivalent spheres, AMP terminal settling velocities, and estimated residence times.
From: Airborne microplastic particles detected in the remote marine atmosphere
Filter number | Polymer detected | Polymer density (g cm−3) | Particle major and minor axis (a, b; µm) | µs = Terminal velocity of droplet/sphere (m s−1) | α = (b/a)2 | µ = AMP terminal velocity (m s−1) | AMP residence timea |
|---|---|---|---|---|---|---|---|
2 | Polystyrene | 0.96–1.04 | 66, 53 | 0.13 | 0.64 | 0.08 | ~ 10 min |
5 | Polystyrene | 0.96–1.04 | 25, 18 | 0.017 | 0.52 | 0.009 | ~1 day |
10 | Polydimethylsiloxane (PDMS) | 0.97 | 22, 17 | 0.014 | 0.6 | 0.008 | ~1 day |
11 | Polydimethylsiloxane (PDMS) | 0.97 | |||||
17 | Polystyrene | 0.96–1.04 | 124, 45 | 0.23 | 0.13 | 0.03 | ~ 5 h |
23 | Polydimethylsiloxane (PDMS) | 0.97 | 17, 13 | 0.01 | 0.58 | 0.006 | ~1 day |
30 | Polystyrene | 0.96–1.04 | 100, 70 | 0.22 | 0.49 | 0.11 | ~5 min |
38 | Polyethylene | 0.88–0.96 | 102, 97 | 0.22 | 0.90 | 0.20 | ~5 min |
39 | Polypropylene | 0.86–0.95 | 172, 17 | 0.26 | 0.01 | 0.003 | ~2 days |
