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Fig. 5. The effect of chitosan gel on visible spectra of the horseradish-treated water. Reaction mixture volume = 10 mL; horseradish amount = 0.3 g enclosed between two 30- x 40-mm chitosan films of a total mass of about 100 mg (dry weight); 2,4-dichlorophenol (2,4-DCP) concentration = 9 mM; H2O2 concentration = 18 mM; pH = 7.0; incubation time = 3 h; incubation temperature = 25°C. The standard error for triplicate absorbance measurements ranged from 0.003 to 0.033.
