摘要
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.
出处
《分析化学》
SCIE
EI
CAS
CSCD
北大核心
2006年第8期1068-1072,共5页
Chinese Journal of Analytical Chemistry
基金
国家自然科学基金(No.20327001)
科技攻关(No.2002AA601330)资助项目
关键词
总磷
磷铝酸修饰电极
光催化氧化
纳米二氧化钛
Total phosphorus, phosphomolybdate modified electrode, photocatalytic oxidation, nanometer titanium dioxide