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Comparison of model FeL complex formation and dissociation rate constants, conditional stability constants, and Fe' and Fe3+residence times in treated with Chelex, photo-irradiated seawater as determined using the kinetic method. Errors represent average mean ± s (standard deviation) from two separate replicates.[1] Data taken from ref. 12 |
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| Model ligand |
kf × 105/M-1s-1 |
kd × 10-6/s-1 |
log KFe'L kinetic |
log KFe 3+ L kinetic |
Fe' residence time/yr |
Fe3+ residence time/yr |
log Ktherm |
|
|
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| Protoporphyrin IXa |
6.2 ± 0.8 |
0.7 ± 0.7 |
11.9 ± 0.5 |
21.9 ± 0.5 |
0.031 |
645 |
-- |
| Protoporphyrin IX Dimethyl estera |
15.3 ± 0.2 |
0.2 ± 0.9 |
13.0 ± 0.2 |
23.0 ± 0.2 |
0.116 |
5866 |
-- |
| Phaeophytina |
12.2 ± 0.1 |
12.3 ± 16.8 |
11.0 ± 1.2 |
21.0 ± 1.2 |
0.002 |
72 |
-- |
| Apoferritinb |
0.93 ± 0.3 |
0.08 ± 0.04 |
12.1 ± 0.1 |
22.1 ± 0.1 |
0.275 |
820 |
-- |
| Phytic acidc |
12.8 ± 0.1 |
0.51 ± 0.28 |
12.4 ± 0.2 |
22.4 ± 0.2 |
0.043 |
1820 |
-- |
| Alterobactin Ad |
3.8 ± 0.8 |
0.17 ± 0.04 |
12.3 ± 0.4 |
22.3 ± 0.4 |
0.129 |
1620 |
49–5318 |
| Alterobactin Be |
8.0 ± 0.6 |
0.25 ± 0.02 |
12.5 ± 0.3 |
22.5 ± 0.3 |
0.088 |
2330 |
43.648 |
| Enterobactin1f |
10 |
15.8 |
10.8 |
20.8 |
0.013 |
46.0 |
49.020 |
| Ferrichromeg |
4.6 ± 2.9 |
0.05 ± 0.04 |
12.9 ± 0.1 |
22.9 ± 0.1 |
0.439 |
6700 |
29.0731 |
| Desferrioxamineg |
19.6 ± 10.1 |
1.5 ± 1.8 |
12.1 ± 0.6 |
22.1 ± 0.6 |
0.015 |
952 |
30.6031 |
|
Fe complexing moieties for the model ligands: aPorphyrin. bProtein. cPhosphate. dβ-Hydroxyaspartate/catecholate. eBis-catecholate. fTris-cate-cholate. gtris-Hydroxamate. | |||||||
Luther et al. Geochemical Transactions 2001 2:65 doi:10.1186/1467-4866-2-65 |
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