Table 1.
Binding parameters of N-DOM and MP-DOM fluorescent components to heavy metals calculated by modified Stern–Volmer modeling.
| N-DOM |
MP-DOM |
||||||||
|---|---|---|---|---|---|---|---|---|---|
| Type | PARAFAC components | fa | LogKb | Rc | Type | PARAFAC components | fa | LogKb | Rc |
| SY + Cr | C1 | 0.6 ± 0.1 | 4.3 ± 0.3 | 0.894 | PP + Cr | C5 | 2.2 ± 0.8 | 2.9 ± 0.9 | 0.979 |
| C2 | – | – | – | C6 | 1.3 ± 0.2 | 3.7 ± 0.1 | 0.939 | ||
| C3 | 1.2 ± 0.1 | 4.1 ± 0.1 | 0.984 | C7 | 1.1 ± 0.1 | 3.8 ± 0.1 | 0.914 | ||
| SY + Cu | C1 | 0.6 ± 0.1 | 4.8 ± 0.2 | 0.989 | PP + Cu | C5 | – | – | – |
| C2 | 1.8 ± 0.6 | 3.7 ± 0.4 | 0.980 | C6 | – | – | – | ||
| C3 | 0.6 ± 0.1 | 4.6 ± 0.2 | 0.982 | C7 | 0.8 ± 0.1 | 3.8 ± 0.3 | 0.976 | ||
| SY + Pb | C1 | 0.3 ± 0.1 | 3.9 ± 0.8 | 0.992 | PP + Pb | C5 | – | – | – |
| C2 | – | – | – | C6 | – | – | – | ||
| C3 | 0.2 ± 0.1 | 4.0 ± 0.8 | 0.990 | C7 | 0.5 ± 0.1 | 4.1 ± 0.3 | 0.989 | ||
| CJ + Cr | C1 | 0.8 ± 0.1 | 4.3 ± 0.1 | 0.960 | PE + Cr | C5 | 3.5 ± 0.4 | 2.6 ± 0.6 | 0.949 |
| C2 | – | – | – | C6 | 1.2 ± 0.1 | 3.9 ± 0.1 | 0.986 | ||
| C3 | – | – | – | C7 | 1.1 ± 0.1 | 4.0 ± 0.1 | 0.979 | ||
| CJ + Cu | C1 | 0.7 ± 0.1 | 4.7 ± 0.1 | 0.982 | PE + Cu | C5 | – | – | – |
| C2 | 0.6 ± 0.1 | 4.9 ± 0.3 | 0.920 | C6 | – | – | – | ||
| C3 | 0.7 ± 0.1 | 4.9 ± 0.1 | 0.898 | C7 | 0.7 ± 0.1 | 4.1 ± 0.3 | 0.960 | ||
| CJ + Pb | C1 | 0.2 ± 0.1 | 4.4 ± 0.2 | 0.785 | PE + Pb | C5 | – | – | – |
| C2 | 0.7 ± 0.1 | 3.8 ± 0.6 | 0.987 | C6 | – | – | – | ||
| C3 | 0.4 ± 0.1 | 4.2 ± 0.4 | 0.949 | C7 | 0.5 ± 0.1 | 4.1 ± 0.3 | 0.956 | ||
| TR + Cr | C1 | 0.6 ± 0.1 | 4.3 ± 0.1 | 0.980 | PVC + Cr | C5 | 1.4 ± 0.1 | 3.5 ± 0.2 | 0.995 |
| C2 | – | – | – | C6 | 1.2 ± 0.1 | 3.8 ± 0.1 | 0.979 | ||
| C3 | – | – | – | C7 | 1.1 ± 0.1 | 4.1 ± 0.1 | 0.964 | ||
| TR + Cu | C1 | 0.6 ± 0.1 | 4.4 ± 0.2 | 0.994 | PVC + Cu | C5 | 0.3 ± 0.1 | 3.5 ± 0.4 | 0.985 |
| C2 | 0.8 ± 0.1 | 4.6 ± 0.2 | 0.926 | C6 | 0.1 ± 0.1 | 3.9 ± 0.9 | 0.899 | ||
| C3 | 1.1 ± 0.1 | 4.1 ± 0.2 | 0.992 | C7 | 0.2 ± 0.1 | 3.8 ± 0.8 | 0.902 | ||
| TR + Pb | C1 | – | – | – | PVC + Pb | C5 | 1.5 ± 0.5 | 2.2 ± 0.2 | 0.999 |
| C2 | 0.8 ± 0.1 | 4.4 ± 0.1 | 0.978 | C6 | – | – | – | ||
| C3 | 0.6 ± 0.1 | 4.6 ± 0.1 | 0.969 | C7 | 0.3 ± 0.1 | 3.2 ± 0.2 | 0.951 | ||
-: Failed to be modeled.
a
Fraction of fluorophore involved in the binding of heavy metals.
b
Conditional stability constants.
c
Quenching model fitting correlation coefficients.