Inhibitory Kinetic Spectrophotometric Determination of Trace Catechol in Waste Water

Objective To establish a kinetic spectrophotometric method for the determination of trace catechol in the waste water. Methods Trace catechol can sensitively inhibit the Arsenazo decolorization reaction with H2O2 catalyzed by Cu(Ⅱ)in dilute H2SO4 medium. Based on the changing of catalyzed reaction speed, a new inhibitory kinetic spectrophotometric method for the determination of trace catechol in the waste water was established. Results The optimum condition, kinetic parameters and reaction mechanism were investigated. It is shown that the linear range of determination was 0.2-1.8 mg/ L, the detection limit was 0.084 mg/L. The RSDs of ΔA for 0.6 mg/L,1.12 mg/L and 1.6 mg/L catechol standard materials for 11 parallel determination were 2.4%, 1.2% and 1.6% respectively. The recovery rates were 98.0% and 96.0%. Conclusion This method can be used for determination of trace catechol in waste water with satisfactory results.