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Table 2 Kinetic values for experimental sets of data for this study

From: Phenylalanine as a hydroxyl radical-specific probe in pyrite slurries

Experiment Set [Phe]o [pyr] R o k' Obs. half-life Calc. half-life half-life ln[Phe]/t
  (μM) (g/L) (μM/hr) (hr-1) (hr) (hr) Ratio R2 - correl.
A 26.6 100 4.01 0.447 3.3 1.6 0.47 0.9627
K pyr = 0.122 μmol g-1 hr-1 103 100 9.32 0.157 5.5 4.4 0.80 0.9849
  307 100 10.3 0.040 18.0 17.3 0.96 0.9994
B 12.5 100 1.43 0.642 3.5 1.1 0.31 0.9293
K pyr = 0.079 μmol g-1 hr-1 37.1 100 3.17 0.199 6.0 3.5 0.58 0.9498
  97.8 100 3.63 0.093 14.0 7.5 0.53 0.9717
  402 100 4.69 0.025 35.0 27.7 0.79 0.9768
  1130 100 4.57 0.008 90.0 86.6 0.96 0.9422
C 1 100 0.79 -- -- -- -- --
  3 100 2.05 -- -- -- -- --
  10 100 5.65 -- -- -- -- --
  30 100 10.2 -- -- -- -- --
  100 100 16.3 -- -- -- -- --
D 10.9 25 + 4.59 0.400 1.5 1.7 1.16 0.9917
K pyr = 0.165 μmol g-1 hr-1 11.4 50 + 6.86 0.844 0.8 0.8 1.03 0.9969
  11.4 100 + 8.57 1.39 0.7 0.5 0.71 --
  28.5 25 4.74 0.156 3.6 4.4 1.23 0.9935
  29.5 50 9.53 0.283 2.0 2.4 1.22 0.9975
  28.6 100 + 15.3 0.559 0.9 1.2 1.38 0.9915
  93.9 25 4.15 0.041 16.8 16.9 1.01 0.9907
  91.9 50 8.65 0.077 8.5 9.0 1.06 0.9909
  94.5 100 18.9 0.143 3.8 4.8 1.28 0.9932
  286 25 3.83 0.014 38.6 49.5 1.28 0.9426
  282 50 6.45 0.025 23.2 27.7 1.19 0.9942
  286 100 17.1 0.047 15.1 14.7 0.98 0.9916
E 8.7 5 0.11 0.017 28.0 40.8 1.46 0.8834
K pyr = 0.021 μmol g-1 hr-1 9.4 10 0.2 0.042 16.5 16.5 1.00 0.9611
  9.3 25 0.40 0.092 10.0 7.5 0.75 0.9000
  10.4 50 0.84 0.130 6.6 5.3 0.81 0.9529
  10.4 100 1.38 0.174 4.5 4.0 0.89 0.9880
F 81.7 10 0.88 0.007 70 99.0 1.41 0.9863
  107 10 (14 m 2 /g) 9.38 0.116 6 6.0 1.00 0.9993
G 98.8 50 15.1 0.079 5.5 8.8 1.59 0.9854
  [o-Tyr]o 94.0 50 14.9 0.081 5.5 8.6 1.56 0.9941
  [m-Tyr]o97.6 50 21.1 0.166 3 4.2 1.39 0.9945
  [p-Tyr]o 97.7 50 21.2 0.163 3 4.3 1.42 0.9922
      Average R 2 (sets A, B, D, E, F) 0.97 ± 0.03
  1. Data for R o determined where approximately 20% of initial Phe was degraded. k'was estimated from time points up to 90% of Phe loss when possible, and varies between experiment sets due to variability in pyrite activity relative to .OH production. Set C was a single-time point experiment and thus the data do not yield relevant k'values or half-lives. + = R o was estimated as Phe loss was greater than 30% by the first time point.