分光光度法测定水中高锰酸盐指数条件的研究

Study on the Conditions for the Determination of Permanganate Index in Water by Spectrophotometry

高锰酸盐指数,通俗上也叫化学需氧量的高锰酸钾法。它是以高锰酸钾这种物质作为氧化剂,在标准规定的前提条件下,水中的有机物只有一部分能被氧化,并不是理论上的完全氧化的需氧量,它的反应所需时长、温度、氧化剂的浓度、反应的酸度很大程度上影响了实际上的氧化效率。分光光度法适用于地表水、饮用水、地下水等一些洁净水中高锰酸盐指数的测定。该方法与国标的《GB 11892—1989水质高锰酸盐指数的测定》比对结果显示没有显著差异,标准偏差和准确度都能达到预期的要求。且该方法样品取用量和试剂使用量小、检测耗时较短、自动化的程度高,很适用于批量检测样品。

Permanganate index, also known as chemical oxygen demand of potassium permanganate method. It uses potassium permanganate as oxidant. Under the specified conditions, the organic matter in water can only be partially oxidized, not the theoretical oxygen demand. Its reaction time, temperature, oxidant concentration and acidity greatly affect the actual oxidation efficiency. Spectrophotometry is suitable for the determination of permanganate index in surface water, groundwater, drinking water and other clean water. This method has no significant difference with the "GB 11892—1989 Water Quality Permanganate Index". The accuracy and standard deviation can meet the expected requirements. The method has the advantages of small sample and reagent consumption, short analysis time, high automation and is suitable for batch analysis.