COD在线监测仪器比对监测采样误差分析研究

化学需氧量(COD)和悬浮物(SS)是衡量污水对外界环境的污染程度的重要指标.化学需氧量是指在强酸并加热条件下,用重铬酸钾作为氧化剂处理水样时所消耗氧化剂的量.悬浮物即"不可滤残渣"是指将水过滤后留在过滤材料上的物质.针对引起比对分析监测结果中采样环节误差的原因,从理化概念入手,分析了环境样品随沉降时间不同引起的CODcr值的变化,以及CODcr值与SS值的相关性,并提出了相应的对策.以提高COD在线监测结果的科学性、可靠性,使其更好地发挥COD在线监测仪在环境管理中的作用,为污染减排和污染物总量控制工作提供准确、科学的技术支持.

Error Analysis of Sampling COD cr On-line Monitoring Instrument

Chemical oxygen demand( COD) and suspended solids( SS) are important indicators to measure the extent of sew-age pollution to the external environment. Chemical oxygen demand( BOD) is the amount of oxidant consumed when treated with potassium dichromate as an oxidant under strong acid and heating conditions. Suspended matter, that is, "non-filtration resi-due", refers to the substance that filters the water and leaves it on the filter material. The reasons for the sampling error caused by comparison and analysis of the monitoring results, starting from the physical and chemical concepts, analysis of environmental samples with different settling time caused by the change of the CODcr value of the correlation with SS values and CODcr values, and puts forward the corresponding countermeasures. In order to improve the scientific and reliability of the monitoring results of online COD, make it play a better role of COD online monitoring instrument in environmental management, to provide accurate, scientific and technical support for the work of total control of pollution reduction and pollution.