河道水体化学需氧量检测方法分析与验证

Analysis and Vlidation of Chemical Oxygen Demand Detection Methods for River Water Bodies

为解决河道水体检测过程中试剂消耗大、样品分析时间长、二次污染等问题,利用微流控技术和臭氧化学发光原理,研制了微流控芯片,搭建河道水体化学需氧量检测的硬件系统和软件系统。化学需氧量是利用化学方法检测水体中被氧化的还原性物质的量,是评价水体受污染程度的综合指标。利用该系统进行试验研究,分析数据采集系统采集化学发光信号,并进行数据拟合分析。根据化学发光强度与化学需氧量的对应关系,间接获得化学需氧量值,并与标准重铬酸钾法进行比较;结果表明,两者的平均偏差小于±5%,验证了该化学需氧量检测系统的可靠性和准确性。

To solve the problems of high reagent consumption,long sample analysis time,and secondary pollution in river water testing,a microfluidic chip through microfluidic technology and the principle of ozone chemiluminescence are used to build a hardware system and a software system for chemical oxygen demand testing in river water.COD is a chemical method to detect the amount of oxidised reducing substances in a water body and is a comprehensive indicator to evaluate the degree of pollution of a water body.The system is used for a pilot study to analyse the data acquisition system to collect the chemiluminescence signal and to fit the data for analysis.Chemical oxygen demand values are obtained indirectly based on the correspondence between chemiluminescence intensity and chemical oxygen demand and compared with the standard potassium dichromate method.The average deviation between the two is accepted to be less than±5%,verifying the reliability and accuracy of COD detection system.