TABLE 2.

Summary of Fe(II) oxidation rates (R_Fe(II)) measured from laboratory reactors with sediments collected from the Lower Red Eyes acid mine drainage site^a

Parameter	Result for location:
	Upstream		Downstream
	Terrace	Pool	Terrace	Pool
Avg mass of sediments (g)	103 ± 9.30	13.0 ± 9.70	100 ± 3.20	11.8 ± 2.58
Avg surface area of sediments (cm2)	130 ± 17.0	59.8 ± 11.2	119 ± 17.9	56.5 ± 17.5
Avg net Fe(II)out/Fe(II)in	0.45 ± 0.04	0.61 ± 0.02	0.73 ± 0.02	0.80 ± 0.01
Avg net Feout/Fein	0.73 ± 0.02	0.79 ± 0.09	0.86 ± 0.04	0.88 ± 0.02
RFe(II) (10−7 mol liter−1 s−1)	1.58 ± 0.53	1.03 ± 0.31	0.75 ± 0.25	0.57 ± 0.23
RFe(II) (10−9 mol liter−1 s−1 g−1)	1.60 ± 0.41	10.4 ± 6.58	0.74 ± 0.24	4.79 ± 1.58
RFe(II) (10−9 mol liter−1 s−1 cm−2)	1.25 ± 0.49	1.75 ± 0.56	0.63 ± 0.17	1.08 ± 0.52

^aAll results were calculated from dissolved Fe(II) and dissolved total Fe concentrations measured under pseudo-steady-state conditions achieved at a 10-h hydraulic residence time. Sediment mass and surface area values represent means ± standard deviations (SD) for four measurements (where n = 4 = duplicates from two reactor series = 4 sediment pieces). Rate (R) and extent values represent means ± SD calculated from multiple measurements made under the pseudo-steady-state conditions (3 to 5 sampling points) using duplicate reactor series (where n = 6 to 10 = 3 to 5 sampling points × 2 duplicate reactor series).