Table 1. Iron (Fe) redox rate constants and steady-state Fe(II) fraction ([Fe(II)]ss/[Fe]T) for each standard HS samples.
| Code of SHS | kO2 (M-1 s-1) | kH2O2 (× 103 M-1 s-1) | kred_d (× 10−6 s-1) | kred_p (× 10−5 s-1) | [Fe(II)]ss/[Fe]T (%), dark | [Fe(II)]ss/[Fe]T, light | ||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| pH 8.0 | pH 7.0 | pH 8.0 | pH 7.0 | pH 8.0 | pH 7.0 | pH 8.0 | pH 7.0 | pH 8.0 | pH 7.0 | pH 8.0 | pH 7.0 | |
| 2S101H | 31.4 (1.6) | 6.13 (1.73) | 41.0 (11.0) | 6.51 (0.93) | 9.02 (0.68) | 18.1 (1.8) | 8.20 (1.97) | 36.8 (14.1) | 0.0941 (0.0793–0.112) | 0.996 (0.715–1.47) | 0.942 (0.668–1.27) | 17.7 (9.72–28.3) |
| 1S102H | 17.4 (1.9) | 5.57 (0.28) | 7.11 (5.08) | 1.18 (0.62) | 5.63 (1.26) | 16.5 (0.9) | 39.4 (1.2) | 50.5 (3.1) | 0.124 (0.0830–0.180) | 1.17 (1.03–1.33) | 8.09 (6.85–9.74) | 27.2 (24.7–29.9) |
| 1S103H | 22.4 (1.9) | 8.05 (1.12) | 19.7 (5.8) | 3.52 (0.32) | 8.60 (0.27) | 12.3 (0.0) | 3.96 (0.73) | 35.6 (5.2) | 0.135 (0.117–0.158) | 0.579 (0.509–0.670) | 0.753 (0.568–0.986) | 14.9 (11.7–18.7) |
| 1S104H | 22.4 (1.9) | 6.62 (1.23) | 8.62 (6.24) | 2.94 (0.36) | 9.68 (3.60) | 15.7 (0.7) | 22.9 (3.2) | 53.0 (3.5) | 0.166 (0.0922–0.262) | 0.899 (0.728–1.14) | 3.94 (2.99–5.15) | 23.9 (20.0–29.0) |
| 1R103H | 27.2 (2.4) | 7.55 (1.90) | 19.7 (5.8) | 3.09 (0.20) | 7.83 (0.18) | (n.m.) | (n.m.) | (n.m.) | 0.104 (0.0912–0.120) | (n.a.) | (n.a.) | (n.a.) |
| 1R105H | 29.5 (5.2) | 7.20 (2.22) | 20.5 (5.6) | 5.27 (0.74) | 9.16 (0.07) | 25.8 (2.5) | 6.07 (1.08) | 33.1 (0.5) | 0.113 (0.0940–0.140) | 1.28 (0.901–1.95) | 0.853 (0.607–1.21) | 15.2 (12.0–20.4) |
| 1R107H | 19.9 (4.7) | 10.6 (2.7) | 49.8 (2.6) | 4.01 (0.80) | 7.50 (0.10) | 20.5 (0.6) | 5.03 (1.67) | 27.6 (2.3) | 0.103 (0.0865–0.126) | 0.743 (0.575–1.02) | 0.789 (0.478–1.23) | 9.77 (7.37–13.5) |
| DHA | 45.8 (2.2) | 10.5 (2.3) | 22.2 (2.5) | 4.42 (0.77) | 7.87 (0.43) | 5.29 (0.15) | 12.7 (2.4) | 26.8 (1.7) | 0.0650 (0.0583–0.0724) | 0.192 (0.154–0.250) | 1.10 (0.860–1.37) | 9.02 (7.12–11.8) |
| IHA | 24.5 (4.5) | 9.41 (0.85) | 21.8 (2.6) | 0.589 (0.524) | 9.20 (0.88) | 29.2 (1.7) | 3.75 (0.08) | 36.7 (0.8) | 0.132 (0.101–0.174) | 1.26 (1.08–1.48) | 0.665 (0.546–0.832) | 14.8 (13.3–16.5) |
| 1S101F | 26.0 (2.0) | 5.28 (3.01) | 46.2 (14.5) | 5.61 (1.08) | 18.7 (0.6) | 35.5 (0.7) | 21.1 (2.6) | 40.6 (0.3) | 0.218 (0.185–0.261) | 2.24 (1.47–4.49) | 2.62 (2.04–3.38) | 22.2 (15.8–36.6) |
| 2S101F | 49.8 (3.1) | 4.30 (1.57) | 60.8 (11.1) | 6.23 (1.13) | 16.2 (1.5) | 24.3 (0.1) | 18.7 (5.7) | 37.2 (2.9) | 0.108 (0.0905–0.129) | 1.78 (1.35–2.62) | 1.33 (0.880–1.87) | 22.8 (17.1–31.9) |
| 1R105F | 37.9 (5.2) | 6.13 (2.16) | 26.7 (1.9) | 5.16 (0.68) | 16.9 (2.5) | 20.2 (0.6) | 8.46 (0.69) | 39.0 (1.3) | 0.162 (0.122–0.213) | 1.16 (0.853–1.74) | 0.964 (0.775–1.21) | 19.2 (14.8–26.5) |
| 1R109F | 37.7 (2.1) | 2.16 (1.94) | 87.3 (15.7) | 7.51 (1.79) | (n.a.) | (n.a.) | (n.a.) | (n.a.) | (n.a.) | (n.a.) | (n.a.) | (n.a.) |
| DFA | 24.3 (1.3) | 4.79 (1.31) | 47.4 (13.2) | 6.59 (0.87) | (n.m.) | (n.m.) | (n.m.) | (n.m.) | (n.a.) | (n.a.) | (n.a.) | (n.a.) |
| IFA | 31.5 (1.1) | 1.81 (1.73) | 40.8 (9.7) | 7.17 (0.77) | (n.a.) | (n.a.) | (n.a.) | (n.a.) | (n.a.) | (n.a.) | (n.a.) | (n.a.) |
| BFA | 33.8 (1.5) | 1.54 (2.08) | 103 (7) | 7.45 (1.63) | (n.a.) | (n.a.) | (n.a.) | (n.a.) | (n.a.) | (n.a.) | (n.a.) | (n.a.) |
| Inorganic Fe | 8.8 b | 0.38 b | 37.2 b | 4.79 b | (n.a.) | (n.a.) | (n.a.) | (n.a.) | (n.a.) | (n.a.) | (n.a.) | (n.a.) |
(n.a.): not applicable; (n.m.): not measured.
a The values in parenthesis represent a standard deviation (SD) and the range estimated by taking the upper and lower limits for the SD of redox rate constants into account for the redox rate constants and [Fe(II)]ss/[Fe]T, respectively.
b Inorganic Fe(II) oxidation rate in the 2 mM NaHCO3 and 0.1 M NaCl from Pham and Waite (2008) [5].