不同水体CODcr和BOD5相关性及其在环境监测中的应用

Correlation Between CODcr and BOD5 in Different Waters and Their Application in Environmental Monitoring

以3种常见水体为例,实验研究了五日生化需氧量(BOD 5)和化学需氧量(COD cr)之间存在的相关性。实验结果表明:①嘉陵江南充段水样所含有机污染物较少,BOD 5和COD cr比值(B/C)在0.15~0.19之间,两者线性关系不明显。②对城市污水处理厂出口水样而言,B/C的数值都在0.3上下浮动,BOD 5和COD cr有较为显著的的线性关系。③BOD 5标准样品的B/C的数值在0.6左右浮动,两者线性关系良好,相关系数R达到0.992。这种相关性分析结果有利于提高检测人员分析BOD 5的效率和准确性;有利于环境监测审核人员判断环境监测数据的合理性,降低了不合格监测报告出现的几率。

The linear relationship between BOD5 and CODcr was analyzed by taking three common water samples as examples.The experimental results show that:(1)The water samples in the Nanchong section of Jialing River contain fewer organic pollutants,and the ratio of BOD5 and COD cr(B/C)is between 0.15 and 0.19.The linear relationship between the two is not obvious.(2)For the export water samples of municipal sewage treatment plants,the B/C values fluctuate around 0.3,and BOD5 and COD cr have a significant linear relationship.(3)The B/C value of the BOD 5 standard sample fluctuates around 0.6,and the linear relationship between the two is good,and the correlation coefficient R reaches 0.992.The correlation analysis result is beneficial to improve the efficiency and accuracy of the detection personnel to analyze BOD 5;it is beneficial for environmental monitoring and auditing personnel to judge the rationality of environmental monitoring data and reduce the probability of occurrence of unqualified monitoring reports.