废水中痕量邻苯二酚的阻抑动力学测定法

Inhibitory Kinetic Spectrophotometric Determination of Trace Catechol in Waste Water

目的研究废水中邻苯二酚的动力学光度分析法。方法在硫酸介质中,邻苯二酚能灵敏地阻抑铜(Ⅱ)催化过氧化氢氧化偶氮氯膦胂的褪色指示反应,催化反应速度的减慢程度与邻苯二酚的量有关。采用阻抑动力学光度法,测定痕量邻苯二酚并研究了最佳反应条件和动力学参数,探讨了方法的原理。结果该方法测定邻苯二酚浓度的线性范围为0.2～1.8mg/L,检出限为0.084mg/L。对浓度为0.6、1.12、1.6mg/L的邻苯二酚标准溶液进行11次平行测定,ΔA值的RSD分别为2.4%,1.2%和1.6%;回收率分别为98.0%和96.0%。结论该方法用于废水中邻苯二酚含量的测定,结果满意。

Objective To establish a kinetic spectrophotometric method for the determination of trace cateehol in the waste water. Methods Trace cateehol 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 AA 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.