Table 1.
Characteristics of selective constituents in concentrated ambient particulate matter in the exposure airstream. Values are expressed as mean ± standard deviation. Number of samples is provided in parentheses.
| All CAPs Combined | Coarse CAPs | Fine CAPs | Ultrafine CAPs | |
|---|---|---|---|---|
| Total mass (μg/m3) | 198.0 ± 72.4 (136) | 212.6 ± 51.8 (77) | 238.4 ± 62.0 (29) | 120.0 ± 72.0 (30) |
| Element (ng/m3) | ||||
| Silver (Ag) | 2.5 ± 11.8 (125) | 0.7 ± 0.5 (72) | 1.3 ± 0.8 (25) | 8.2 ± 24.4 (28) |
| Aluminum (Al) | 5608±4152(125) | 8360 ± 2775 (72) | 3685± 2474 (25) | 251±343 (28) |
| Barium (Ba) | 285 ±213 (125) | 386± 179 (72) | 299± 158 (25) | 14.8 ± 9.2 (28) |
| Copper (Cu) | 287±313 (125) | 340 ±220 (72) | 240± 110 (25) | 193 ± 542 (28) |
| Iron (Fe) | 6394±4121 (125) | 8800 ± 2723 (72) | 6172±2550 (25) | 408 ± 274 (28) |
| Potassium (K) | 1813 ± 1348 (125) | 2412± 1283 (72) | 1827±772 (25) | 257± 136 (28) |
| Lithium (Li) | 2.7 ± 1.6 (125) | 3.5 ± 1.0 (72) | 3.0 ± 1.6 (25) | 0.5 ± 0.4 (28) |
| Nickel (Ni) | 32.5 ± 56.8 (125) | 33.5 ± 54.6 (72) | 30 ± 20.5 (25) | 32.6 ± 81.1 (28) |
| Tin (Sn) | 22.5± 16.1 (125) | 27.8 ± 15.5 (72) | 25.3 ± 14.3 (25) | 6.3 ± 5.4 (28) |
| Vanadium (V) | 8.1± 4.4 (125) | 9.9 ± 3.4 (72) | 8 ± 3.7 (25) | 3.5 ± 3.9 (28) |
| OP (% AA depletion/μg CAP in incubation well)a | 0.63 ± 0.72 (76) | 0.80 ± 0.39 (42) | 0.77± 0.34 (8) | 0.33± 1.07 (26) |
a
OP, oxidative potential. AA, ascorbic acid. CAP, concentrated ambient particles.