Table 1 Trace metal concentrations in the PM2.5 samples and the trace metal enrichment factors (mean ± S.D.).
From: Trace metals and magnetic particles in PM2.5: Magnetic identification and its implications
Element | All samples | Summer | Winter | Background value (μg/g) | ||||||
|---|---|---|---|---|---|---|---|---|---|---|
Content in volume (ng/m3) | Content in mass (μg/g) | EF | Content in volume (ng/m3) | Content in mass (μg/g) | EF | Content in volume (ng/m3) | Content in mass (μg/g) | EF | ||
As | 13.25 ± 4.583 | 172.0 ± 61.81 | 82.80 ± 28.73 | 9.633 ± 1.986 | 162.1 ± 72.17 | 77.48 ± 34.70 | 16.89 ± 3.409 | 181.9 ± 49.24 | 88.12 ± 20.76 | 10 |
Cd | 2.038 ± 1.684 | 25.38 ± 17.96 | 1034 ± 781.9 | 1.557 ± 0.977 | 25.47 ± 16.99 | 1018 ± 710.4 | 2.518 ± 2.093 | 25.28 ± 19.33 | 1050 ± 865.8 | 0.126 |
Co | 0.620 ± 0.400 | 8.087 ± 5.706 | 2.986 ± 1.926 | 0.475 ± 0.356 | 7.980 ± 6.734 | 2.744 ± 2.039 | 0.764 ± 0.397 | 8.195 ± 4.633 | 3.228 ± 1.826 | 12.6 |
Cr | 28.95 ± 7.265 | 399.3 ± 186.4 | 23.56 ± 7.439 | 27.12 ± 5.920 | 462.5 ± 221.9 | 26.62 ± 8.084 | 30.78 ± 8.138 | 336.1 ± 116.9 | 20.50 ± 5.341 | 77.8 |
Cu | 45.35 ± 13.77 | 592.2 ± 193.8 | 125.1 ± 30.53 | 36.30 ± 8.501 | 601.9 ± 232.7 | 122.9 ± 32.46 | 54.40 ± 12.02 | 582.6 ± 150.7 | 127.2 ± 29.15 | 22.3 |
Fe | 1096 ± 597.6 | 13553 ± 5410 | 2.195 ± 1.082 | 762.8 ± 257.0 | 12786 ± 5932 | 1.897 ± 0.709 | 1429 ± 658.1 | 14321 ± 4862 | 2.492 ± 1.309 | 30200 |
Mn | 62.41 ± 25.72 | 805.3 ± 325.2 | 6.546 ± 2.310 | 49.63 ± 22.60 | 800.5 ± 365.9 | 6.253 ± 2.021 | 75.19 ± 22.43 | 810.1 ± 288.5 | 6.838 ± 2.585 | 585 |
Ni | 18.89 ± 11.93 | 229.9 ± 122.5 | 40.43 ± 19.92 | 8.637 ± 2.992 | 144.5 ± 71.36 | 24.14 ± 7.959 | 29.14 ± 7.868 | 315.4 ± 101.7 | 56.72 ± 13.88 | 26.7 |
Pb | 93.32 ± 46.48 | 1214 ± 580.4 | 228.3 ± 127.6 | 69.94 ± 28.13 | 1193 ± 649.2 | 219.6 ± 138.6 | 116.7 ± 49.92 | 1235 ± 518.6 | 237.1 ± 118.6 | 26.2 |
Sr | 18.30 ± 11.39 | 250.1 ± 174.3 | 8.853 ± 5.436 | 18.39 ± 9.105 | 308.6 ± 186.1 | 10.68 ± 5.366 | 18.20 ± 13.54 | 191.6 ± 13.66 | 7.029 ± 4.986 | 132 |
Ti | 69.94 ± 24.81 | 914.9 ± 348.7 | 1.000 | 58.42 ± 22.79 | 956.8 ± 419.0 | 1.000 | 81.46 ± 21.56 | 872.9 ± 265.1 | 1.000 | 4100 |
V | 2.130 ± 1.278 | 29.82 ± 25.14 | 1.685 ± 1.197 | 2.206 ± 1.305 | 38.07 ± 31.10 | 2.056 ± 1.360 | 2.054 ± 1.279 | 21.57 ± 13.66 | 1.313 ± 0.896 | 83.4 |
Zn | 324.5 ± 110.3 | 4222 ± 1546 | 329.3 ± 131.2 | 279.7 ± 91.87 | 4541 ± 1830 | 351.6 ± 158.9 | 369.4 ± 111.0 | 3902 ± 1159 | 307.1 ± 95.05 | 62.6 |
