化学需氧量(COD)的新型测定方法及研究进展

New Methods and Research Progress on Determination of Chemical Oxygen Demand

化学需氧量(COD)是我国污染排放总量控制指标之一,最常用的测定方法是国标法(重铬酸钾法和高锰酸钾法),虽然测定结果准确、重现性好,但是仍然存在诸多不足。文章总结了COD测定的一些新型方法:光催化氧化法、电极氧化法、库仑滴定法、臭氧氧化结合化学发光法、分光光度法、相关系数法、生物法等;并对COD在线自动监测技术和仪器的研发前景进行了展望。

Chemical oxygen demand （short for COD） is one of the control indicators of total quantity of pollutant emissions in China. The most commonly used method for determination is national standard method （including potassium dichromate and potassium permanganate）, it has good precision and repeatability, but there are still many shortcomings. The paper generalized some new methods to measure COD, such as photo catalytic oxidation, electrode oxidation, coulometric titration and ozone oxidation with chemoluminescence, spectrophotometry, correlation coefficient and biological method. Moreover, the on-line automatic monitoring technology and instrument are prospected.