12.78 Wet air oxidation is a technology used for treating wastewaters that are either too diluted to incinerate or too concentrated or toxic to biologically degrade. Oliviero et al. (Transactions of IChemE, 2003) recorded the concentrations of liquid phase reaction intermediates and time profiles.

Table below gives carbon concentrations in various intermediates during the catalytic oxidation of aniline at 200°C over time (in min).

a Determine whether the mean concentrations of the three groups differ significantly at the 5% level of significance.
b Is blocking by time effective in this experiment?

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Carbon Concentration (mmol L-) Time (min) Group A Group B Group C 290 20 0.80 2.00 3.6 40 2.00 2.05 4.5 60 3.00 1.80 6.0 80 3.50 1.95 7.1 100 3.25 1.85 7.0 120 3.25 2.00 6.3 140 3.10 2.10 5.9 160 3.15 2.00 4.8 180 2.70 2.00 4.8