Table 2.
Comparison of inhaled particle mass during 8-hr exposure for adult and 3-month child.
| Particle Size Range, μm a | Particle Size CMD, nm (GSD) | Calcium Ratio in Air in Impactor Size Bin b | Mass Concentration in Particle μg/m3c |
Total Accumulated Deposited Mass in Lung, μg during 8-hr exposure |
||||
|---|---|---|---|---|---|---|---|---|
| Adult, >21 y |
Child, 3 months |
|||||||
| Total ICP/MS Elementsd | Ca2+ | Total ICP/MS Elements | Ca2+ | Total ICP/MS Elements | Ca2+ | |||
| <0.25 | 124.88 (1.56) | 0.181 (0.202) | 97.63 | 17.67 | 78 | 14.3 | 27.5 | 4.9 |
| 0.25–0.50 | 316.84 (1.20) | 0.179 (0.189) | 70.20 | 12.57 | 48.8 | 8.7 | 18.4 | 3.3 |
| 0.5–1.0 | 583.09 (1.11) | 0.132 (0.146) | 21.23 | 2.80 | 18.4 | 2.4 | 5.8 | 0.77 |
| 1.0–2.5 | 1016.80 (1.14) | 0.1193 (0.124) | 12.10 | 1.44 | 18.7 | 2.2 | 4.0 | 0.48 |
| >2.5 |
5558.94 (NAe) |
0.051 (0.060) |
9.78 |
0.50 |
35.7 |
1.8 |
3.1 |
0.26 |
| Sum |
– |
– |
211 |
35 |
199.6 |
29.4 |
58.8 |
9.7 |
| Normalized for body weight f | – | – | – | – | 2.8 | 0.4 | 9.8 | 1.6 |
a
Based on Impactor Size Bin (Table S2).
b
Assumes calcium ratio 0.2 in fill water; measured calcium ratios in air in 5 size bins are shown as values in parentheses.
c
Assumes total concentration as 211 μg/m.3.
d
Values do not include bicarbonate which could not be measured by ICP-MS.
e
NA because N in Eqn.2 in SI is smaller than 1.
f
Unit in μg-chemical/kg-body weight, assume adult body weight 70 kg, and 3-month child 6 kg4.