阻抑动力学光度法测定痕量邻苯二甲酸二辛酯

Determination of trace dioctyl-o-phthalate by inhibitory kinetic spectrophotometry

在HAc-NaAc缓冲介质中，邻苯二甲酸二辛酯对H2O2氧化中性红褪色反应有明显的抑制作用，据此建立了测定痕量邻苯二甲酸二辛酯的阻抑动力学光度法。测定的线性范围为0．26～4．10μg/mL，检出限为0．038μg／mL，回收率在98％～102％之间。该方法已用于一次性塑料袋、塑料拖鞋、河泥中邻苯二甲酸二辛酯的测定。

An inhibitory kinetic spectrophotometric method has been proposed for the determination of trace dioctyl-o-phthalate. The method is based on the inhibitory of dioctyl-o-phthalate to discoloring reaction of neutral red oxidized by hydrogen peroxide in the medium of NaAc-HAc buffer solution. The linear range is 0. 26 - 4.10μg/mL, and the detection limit is 0.038μg/mL. The recovery ranges from 98% to 102%. This method has been applied satisfactorily to the determination of dioctyl-o-phthalate in disposable plastic bag, plastic, slipper and river soil.