Wattie and Butterfield (1944) on the inactivation of E. coli with free chlorine at 2 °C and pH 8 are given below. Fit the data to the Chick–Watson and calculate the coefficients of specific lethality and lag coefficient, and comment on the results.
C, mg/L T, min log(N/N0)
0.05 1.0 –0.02
0.05 3.0 –0.09
0.05 4.9 –0.15
0.05 9.6 –0.68
0.05 18 –2.52
0.07 1.0 –0.06
0.07 3.0 –0.22
0.07 4.9 –0.58
0.07 9.7 –2.28
0.14 1.0 –0.24
0.14 2.8 –0.95
0.14 4.5 –2.15
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