微波加热法检测水体中化学耗氧量的研究

Study on the Determination of Chemical Oxygen Demand in Water by the Microwave Heating Method

本文研究了微波加热法快速测定水体中化学需氧量的分析方法,考察了微波消解功率、微波加热时间以及标准物质等因素对化学耗氧量COD(Mn)测定结果的影响。与传统的电炉加热法比较,测定结果用F-检验法及t-检验法分别进行检验,没有发现显著性差异。而用微波加热法处理样品的时间缩短,大大提高了工作效率,而且操作安全、简便、快速。本文用微波加热法分别对自来水、大沽河水及黄河水样进行了测定,方法的变异系数<4%,加标回收率在97.4%~104.4%,结果令人满意。

In this paper,the analytical method of rapid determination of chemical oxygen demand in water by microwave heating was studied,and the effects of microwave digestion power,microwave heating time and standard substances on the determination of chemical oxygen consumption COD(Mn)were investigated.Compared with the traditional electric cooker heating system,there is no significant difference according to F-test and t-test.This method not only saves the heating time,greatly improves the working efficiency,but also easily and simply operates,and improves the speed.Using the microwave heating system,we analyzed the tap water,the Dagu River water and the Yellow River water,the coefficient of variation<4%,and the recovery is 97.4%~104.4%,the results are satisfactory.