流动注射在线光催化降解-分光光度法测定水中总磷

Determination of Total Phosphorus in Water by Flow Injection On-line Photocatalytic Digestion Spectrophotometry

本文研究了利用二氧化钛光催化作用并添加适量过硫酸钾降解水体中的无机 /有机膦 ,通过流动注射分光光度法法测定总磷的含量。结果表明 :在二氧化钛和过硫酸钾的协同作用下 ,可有效降解无机 /有机膦。利用流动注射技术可以快速测定总磷的含量 ,在 30样 / h的采样频率下 ,检出限 (3σ)为 0 .0 2 mg/ L,线性范围为 0— 2 .5 mg/ L,RSD为 0 .2 1%。可用于工业循环水总磷的测定 。

A UV photocatalytic digestion system for the highly sensitive flow-inject spectrophotometric determination of total phosphorus in recycle water was described.Sample was digested in a UV photo-reactor with TiO 2 and potassium persulfate.A detection limit(3σ)of 0.02mg/L was achieved at a sampling frequency of 30h -1.The relative standard deviation was 0.21% for the determination of 0.4mg/L phosphorus (n=11).This method can be applied for the detection of total phosphorus in recycle water with satisfactory results.