摘要
化学需氧量(CODcr)、高锰酸盐指数(CODMn)通常被作为直接表示水体中有机物相对含量的指标,化学需氧量和高锰酸盐指数是指在一定条件下,以不同的氧化剂,即重铬酸钾(K2Cr2O7)和高锰酸钾(KMnO4)氧化水中的亚硝酸盐、亚铁盐、硫化物和有机物所消耗的氧化剂的量,以氧的mg/L表示,二者均是条件性指标。通过选取北京市北运河水系原宣武区内西便门、右安门两个监测断面,对其进行了高锰酸盐指数和化学需氧量的相关性分析,通过相关系数分析及F检验,表明高锰酸盐指数与化学需氧量显著相关。同时在分析过程中发现虽然同为一条水系,但由于这两个监测断面受污染的程度不同,其高锰酸盐指数与CODcr的线性关系并不完全相同,但差异不大。因此可以用高锰酸盐指数估算CODcr结果,可以减少CODcr监测频次,降低分析产生的Cr6+的二次污染。
CODcr and CODMn are usually used as a direct indicator of the relative content of organic matter in the water. COD and CODMn are the amount of different oxidants（KaCr207 and KMnO4） demand by oxidizing the ferrous salts, sulfides and organic matter under certain conditions. The unit is mg/L and both of them are the condition index. This paper selected two monitoring sections in the Xibianmen and Youanmen in the North Canal, and did some correlation analysis between the COD, and CODMn. Through the analysis of correlation coefficient and the F test, it indicated that CODcr is significantly associated with the C CODMn. At the same time, it indicated that the two linear relations are not same even the two monitoring sections in the same walet system, because the level of contamination is different. However, the difference is small. So we can estimate CODer by reterencing the CODMn, in order to reduce the secondary Cr^6＋ pollution by reducing the CODcr monitoring frequency.
出处
《环境科学与管理》
CAS
2011年第9期118-121,共4页
Environmental Science and Management
