Table 2. Summary of Kinetic Fe(II) Oxidation Experiments by Nitrite in P. denitrificans Cultures and Spent Mediuma.
| reactant
changes within ∼4 h |
Fe(II)
oxidation |
NO2– reduction |
||||
|---|---|---|---|---|---|---|
| ΔFe(II) | ΔNO2– | model | kapp (LCI;UCIc) | model | kapp (LCI;UCIc) | |
| [mM] (%b) | [mM] (%b) | R2 | [103 M–1 s–1] | R2 | [103 M–1 s–1] | |
| P. denitrificans | ||||||
| #1 | –3.7 (76%) | –1.9 (36%) | 0.9991 | 12 (11;14) | 0.9991 | 11 (8;15) |
| #2 | –3.3 (73%) | –1.8 (36%) | 0.9984 | 11 (9;13) | 0.9996 | 10 (8;12) |
| #3 | –3.2 (69%) | –1.8 (38%) | 0.9977 | 10 (7;13) | 0.9985 | 11 (6;17) |
| Filter Sterilized | ||||||
| #1 | –3.6 (73%) | –1.8 (33%) | 0.9990 | 11 (9;12) | 0.9981 | 10 (6;15) |
| #2 | –3.2 (71%) | –1.7 (34%) | 0.9985 | 11 (9;13) | 0.9995 | 10 (8;12) |
| #3 | –3.2 (65%) | –1.7 (37%) | 0.9983 | 9 (7;11) | 0.9988 | 12 (7;17) |
a
The experiment was conducted at 25 °C. P-values for the model parameter k2 are <0.01. R2 is the adjusted regression coefficient for the least-squares fit.
b
Percentage change of [Fe(II)] and [NO2–] relative to starting concentrations.
c
Lower (LCI) and upper (UCI) 95% confidence interval of parameter derived from model fit.