Table 3. Maximal Rates of Fe(II) Oxidation Reported for Various Anaerobic Processes at Circumneutral pH (25–30 °C, Except Where Otherwise Indicated).

	experimental conditions					max. rates
	pH	buffer	Fe(II)	nitrite	nitrate	ΔFe(II) [μM/h]	reference
Chemical (Abiotic)
+30 mg/L lepidocrocite (γ-FeOOH)	7.5	autotitration	0.2 mM	0.2 mM		–7	(36), Figure 5
+30 mg/L lepidocrocite (γ-FeOOH)	8.5	autotitration	0.2 mM	0.2 mM		–40	(36), Figure 5
Fe(II) as siderite (10 g/L ∼ 80 mM)	6	MES/PIPES/HEPES	10 g/L	4.6 mM		–265	(39), Figure 5
Fe(II) as siderite (10 g/L ∼ 80 mM)	6.5	MES/PIPES/HEPES	10 g/L	4.6 mM		–169	(39), Figure 5
Fe(II) as siderite (10 g/L ∼ 80 mM)	7.9	MES/PIPES/HEPES	10 g/L	4.6 mM		–140	(39), Figure 5
+2.5 mM Fe(II) as HFO, 64 μM average solid-bound Fe(II)	6.8	PIPES	0.38 mM	0.38 mM		–158	(37), Table 1, #6
+17.5 mM Fe(III) as HFO, 188 μM average solid-bound Fe(II)	6.8	PIPES	0.34 mM	0.32 mM		–301	(37), Table 1, #11
F(II) as green rust	8.25	autotitration	10.81 mM		14.2 mM	–139	(42), Table 1
+2 mM NTA	7	bicarbonate	2 mM	2 mM		–192	this study, Table 1
+2 mM CIT	7	bicarbonate	2 mM	2 mM		–134	this study, Table 1
+10 mM CIT, P. denitrificans spent medium	7	bicarbonate	5 mM	5 mM		–1695	this study, Table 2
+10 mM CIT, P. denitrificans culture	7	bicarbonate	5 mM	5 mM		–1910	this study, Table 2
Mixed (Chemical + Biological)
D. frappieri strain G, Fe(II) complexed by 10 mM NTA	∼7	bicarbonate	4.8 mM	1.4 mM	2.5 mM	–294	(20), Figure 5
D. frappieri strain G, Fe(II) as smectite	∼7	bicarbonate	3 mM	1.4 mM	5 mM	–175	(20), Figure 6
Pseudogulbenkiania sp. MAI-1, Fe(II)-NTA	7	bicarbonate	4 mM	5 mM	10 mM	–360	this study, Figure 2
Chemotrophic
enrichment culture, +1 mM acetate	7	bicarbonate	10 mM	?	3 mM	–106	(4), Figure 1
enrichment culture containing Sideroxydans species	6.8	bicarbonate	10 mM	?	4 mM	–156	(29), Figure 1a
Pseudogulbenkiania strain 2002	6.8	bicarbonate	10 mM	?	2.2 mM	–74	(16), Figure 4
strain HidR2, +1 mM acetate	6.7	bicarbonate	6 mM	<30 μM	5 mM	–66	(14), Figure 2
Ferroglobus placidus, 85C	7	bicarbonate	2 mM	up to 550 μM	0.64 mM	–173	(5), Figure 4
cell suspension of D. suillum, grown on acetate + nitrate	6.8	bicarbonate	10 mM	?	10 mM	–4700	(12), Figure 3a
Paracoccus ferrooxidans, +25 mM EDTA, +1 mM ethanol	7	bicarbonate	25 mM	?	5 mM	–1600	(13), Figure 3a
Acidovorax sp. strain BoFeN1, +2 mM acetate	6.8	bicarbonate	2.5 mM	<1 mM	5 mM	–48	(15), Figure 2
Acidovorax sp. strain BoFeN1, +5 mM acetate	7	bicarbonate	10 mM	0 mM	10 mM	–240	(30), Figure 1a
Acidovorax sp. strain 2AN, +1.6 mM acetate	6.85	bicarbonate	8.3 mM	up to 1 mM	5 mM	–158	(24), Figure 2a
Acidovorax sp. strain 2AN, + 4 mM EDTA, +1.2 mM ethanol	7	PIPES	4 mM	?	5 mM	–970	(49), Figure 3c
Dechloromonas sp. UWNR4, + 4 mM EDTA, +1.2 mM ethanol	7	PIPES	4 mM	?	5 mM	–950	(49), Figure 3d
lake sediment slurry	∼7	bicarbonate	1.4 mM	0.01 mM	1 mM	–6	(69), Figure 3
Phototrophic
Rhodopseudomonas palustris strain TIE-1, + 0.2 mM citrate	7	bicarbonate	4.5 mM			–21	(3), Figure 2
Rhodobacter capsulatus strain SB1003, +0.2 mM citrate	7	bicarbonate	0.1 mM			–34	(3), Figure 4
Rhodobacter capsulatus strain SB1003, +1 mg/L HA	7	bicarbonate	0.1 mM			–50	(70), Figure 4
Rhodobacter capsulatus strain SB1003, +0.2 mM NTA	7	bicarbonate	0.1 mM			–112	(70), Figure 4