Table 1. Surface properties related to bioaerosol generation by raindrops impinging on soils and TLC plates.
| Media | Media hydraulic diffusivity | Critical surface temp. | Critical impact speed | Aerosolization efficiency: ɛ (%) | ||||
|---|---|---|---|---|---|---|---|---|
| Name | Dcap (mm2 s−1) | Tc (°C) | Vc (m s−1) | 1 μm latex bead | 10 μm latex bead | C. glutamicum | P. syringae | B. subtilis |
| TLCA | 9.5 | 30 | 1.4 | 0.16 | 2.34 | 0.093 | NA | NA |
| TLCC | 22.4 | 30 | 1.33 | 2.24 | 2.68 | 0.16 | 0.034 | 0.0074 |
| ClayA | 2.6 | 30 | 1.53 | 0.15 | 0.87 | 0.004 | 0.0066 | 0.0021 |
| ClayB | 1.4 | 40 | 1.33 | 0.15 | 3.56 | 0.02 | 0.0392 | 0.0088 |
| Sandy clayA | 12 | 20 | 1.47 | 0.83 | NA | 0.013 | 0.0103 | 0.0034 |
| Sandy clayB | 4.8 | 50 | 1.33 | 1.24 | NA | 0.0060 | 0.0072 | 0.0102 |
| SandA | 127.6 | 30 | 1.53 | 0.01 | 0.05 | NA | NA | NA |
| SandB | 252.8 | NA | NA | NA | NA | NA | NA | NA |
Dcap, Tc and Vc are hydraulic diffusivity54, critical temperature and critical impact velocity of the surfaces, respectively. In the case of SandA and SandB, the dispersion of bacteria was not observed due to the low aerosolization efficiency; especially any particles and bacteria were not transferred by raindrops on SandB.