Table 2 Synoptic table (mean value, min-max values and standard deviation) of elements concentration (ng m -3 ) determined in PM 2.5 in downtown Rome (LOD: limit of detection; * expressed as pg m -3 ; ** expressed as μg m -3 )
Element | PM2.5 | ||
|---|---|---|---|
| Â | Mean | Min-Max | St. dev. |
As | 1.06 | 0.121-2.76 | 0.044 |
Au | 0.009 | 0.000-0.050 | 0.012 |
Ba | 3.76 | 1.91-6.45 | 2.38 |
Br | 17.1 | 3.20-50.4 | 13.9 |
Ce | 0.130 | 0.033-0.335 | 0.089 |
Co | 0.167 | 0.077-0.331 | 0.065 |
Cr | 3.03 | 1.29-6.40 | 1.30 |
Cs | 0.047 | 0.004-0.124 | 0.037 |
Eu* | 1.14 | 1.12-1.16 | 0.029 |
Fe** | 0.074 | 0.005-0.212 | 0.059 |
Hf | 0.018 | 0.006-0.032 | 0.010 |
Hg | 0.818 | 0.195-2.12 | 0.655 |
La* | 22.6 | 8.73-53.3 | 10.5 |
Mo | 0.748 | 0.017-3.04 | 0.699 |
Nd | <LOD | Â | Â |
Ni | 3.54 | 1.91-5.82 | 1.45 |
Rb | 1.82 | 0.416-3.74 | 1.07 |
Sb | 3.60 | 0.690-12.6 | 3.24 |
Sc* | 3.14 | 0.208-7.49 | 2.41 |
Se | 0.567 | 0.116-1.55 | 0.415 |
Sm* | 3.88 | 0.208-7.78 | 2.13 |
Th | 0.027 | 0.007-0.041 | 0.010 |
W | 0.636 | 0.062-2.86 | 0.682 |
Yb | 0.011 | 0.003-0.027 | 0.007 |
Zn | 58.0 | 4.78-252 | 61.3 |