Table 1 Results from transmission electron microscopy. The semi quantitative amounts of carbon aggregates and mineral particles (see text) and mean values with standard deviations for the geometric diameters of primary particles.
Sample | Carbon aggregates | Mineral particles | Mean diameter (nm) |
|---|---|---|---|
Tunnel St+ | + | ++ | 25 ± 7 |
Tunnel St- | ++ | + | 24 ± 6 |
Wood | +++ | - | 31 ± 7 * |
Diesel | +++ | - | 24 ± 7 |