高氯废水COD值测定方法研究

化学需氧量(COD)是水质监测的重要指标之一,而氯离子是COD值测定中的主要干扰物。如何消除氯离子干扰,是提高COD值测定准确的关键。当高氯废水中氯离子质量浓度为40000mg/L时,比较在不同COD值下,重铬酸钾法和碘化钾碱性高锰酸钾法测定COD值的准确性。此外,研究得出了HJ/T132-2003方法中测量水中含有氧化性物质的水样COD时,其中的预处理方法不适用。

Study on determination of cod inhigh chlorine wastewater

Chemical oxygen demand(COD for short) is one of the important indicators of water quality monitoring, but chloride ion is the main interference in the determination of COD value. How to eliminate chloride ion interference is the key to improve the determination of COD value. When the chloride ion concentration in thehigh chlorine wastewater is 40000mg/L, the accuracy of COD is determined by potassium dichromate method and potassium iodide alkaline potassium permanganate method under different COD values. In addition, the method of pretreatment of water samples in HJ/T132-2003 method for the presence of oxidizing substances in water is not applicable.