Br^-离子选择性电极法测定地表水化学需氧量的研究

Study on the detection of the COD values of the ground water by using bromide ion selective electrode

该文基于KBrO_3能在光照的纳米TiO_2表面接受光生电子,减少纳米TiO_2光生电子和光生空穴的复合,提高纳米TiO_2的光催化氧化能力,提出了一种新的光催化氧化体系——纳米TiO_2-KBrO_3协同作用测定地表水化学需氧量(COD)的方法。以Br^-离子选择性电极为手段探讨了光催化氧化COD的机理,考察了测定COD的最佳反应条件。实验结果表明,该方法条件温和,不会造成二次污染,能够实现COD快速准确的测定。在该实验所选择的条件下,可准确的测定2.0～100 mg/L之间的COD值,检测限为0.8 mg/L。

A new photocatalytic and oxidation system, nano TiO_2—KBrO_3 synergic system, for the detection of the chemical oxygen demand (COD) of the ground water was studied. The bromide ion selective electrode was used as the detection method so that the detection time was largely shortened. This new method is a fast and precise method for detecting the COD value without producing second pollution. The optimal experimental conditions of the detection were discussed by using glucose as a standard substance. The application range is 2.0～100mg/L, and the lowest limit of detection is O. 8 mg/L.