纳米二氧化钛膜光催化分解-电化学法联用测定水体中的总磷

Determination of Total Phosphorus in Water Based on Nanometer Titanium Dioxide Film Photocatalytic Oxidation with Electrochemical Method

利用电化学方法制备了磷钼酸修饰电极，该修饰电极对溶液中的PO4^3-有很好的电流响应，继而提出了一种用纳米TiO2-K2S2O7共存体系光催化氧化有机磷生成正磷，然后以磷铝酸修饰电极进行测定的新方法。实验中以有机膦酸为标准物质，研究了测定机理，优化了测定条件。实验表明，本方法操作简单、快速、准确。PO4^3-在0．04～16mg/L浓度范围内，与修饰电极上的电流响应呈线性关系，检出限为0．02mg／L。用本方法测定实际水样与标准分析方法所得结果相近。

A new method of detection total phosphorus in water based on nano-TiO2-K2S2O8co-existed system photocatalytic oxidation with PMo12 film modified electrode was described. The PMo12 film modified electrode was prepared with phosphomolybdate （PMo12） by electrochemical syntheses on a glassy carbon electrode. The PMo12 film modified electrode shows high electrochemical response toward PO4^3- and thus could be used as an anaperometric sensor for the determination of the PO4^3-. The optimal experimental conditions and the mechanism of the detection were discussed by using organophosphonic acid as a standard substance. The experiment showed that this method is convenient and can implement fast and accurate determination. The determination range of PO4^3- was 0.04 - 16 mg/L and the limit of detection was 0.02 mg/L. The method was also applied to determine total phosphorus of real water samples. The results were in good agreement with the standard method.