Table 3. Isotope ratios and the elemental content of possible additional lead sources.
| Materials | 206Pb/207Pb | 208Pb/206Pb | Reference |
|---|---|---|---|
| Leaded vehicle exhaust | 1.11 | 2.194 | Mukai et al. (1993) |
| Unleaded automobile exhaust | 1.131–1.164 | 2.106–2.142 | Tan et al. (2006) |
| Coal | 1.153–1.182 | 2.090–2.220 | Mukai et al. (2001) |
| Metallurgic dust | 1.161–1.185 | 2.054–2.100 | Tan et al. (2006) |
| Industrial sources | 1.176 | 2.1 | Mukai et al. (2001) |
| TSP (Spring) | 1.063–1.098 | 2.165–2.204 | This study |
| TSP (Summer) | 1.069–1.168 | 2.094–2.197 | This study |
| TSP (Autumn) | 1.061–1.132 | 2.112–2.206 | This study |
| TSP (Winter) | 1.069–1.200 | 2.160–2.202 | This study |