Table 1. Chemical constituents of coal samples found in the major CPI-PPI network.
| Compound | Classification | Chemical classification |
|---|---|---|
| Acenaphthene | Organic | Polycyclic Aromatic Hydrocarbon |
| Anthracene | Organic | Polycyclic Aromatic Hydrocarbon |
| Benzo(a)pyrene | Organic | Polycyclic Aromatic Hydrocarbon |
| Benzo(b)fluoranthene | Organic | Polycyclic Aromatic Hydrocarbon |
| Fluoranthene | Organic | Polycyclic Aromatic Hydrocarbon |
| Naphthalene | Organic | Polycyclic Aromatic Hydrocarbon |
| Phenanthrene | Organic | Polycyclic Aromatic Hydrocarbon |
| SiO2 | Inorganic | Oxide of silicon |
| TiO2 | Inorganic | Oxide of titanium |
| Fe2O3 | Inorganic | Oxide of iron |
| Al | Inorganic | Metal |
| Ca | Inorganic | Alkaline earth metal |
| Cl | Inorganic | Halogen |
| Cr | Inorganic | Transition metal |
| Fe | Inorganic | Transition metal |
| K | Inorganic | Alkali metal |
| Mg | Inorganic | Alkaline earth metal |
| Mn | Inorganic | Transition metal |
| Na | Inorganic | Alkali metal |
| Ni | Inorganic | Transition metal |
| S | Inorganic | Non-metal |
| Sr | Inorganic | Alkaline earth metal |
| Ti | Inorganic | Transition metal |
| Zn | Inorganic | Transition metal |