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| Peak | Type | E m/nm | E x/nm |
|---|---|---|---|
| A | UV region FA | 370–460 | 230–260 |
| B | Protein-like (tryptophan-like) | 305–310 | 225–230 |
| C | Visible light region humic substance | 370–480 | 310–360 |
| D | Soil HA | 430–510 | 350–440 |
| E | Soil HA | 420–450 | 280–288 |
| T | Protein-like (tryptophan-like) | 320–350 | 275 |
| M | Marine-derived humic substance | 380–420 | 330–350 |
