K_2Cr_2O_7法和紫外分光光度法测定污水COD的对比研究  

Comparative Study on COD Determination Using K_2Cr_2O_7 and UV Spectrophotometry Method

作　　者：展惠英[1] 蒋煜峰[2] 王进喜[1] 魏惠荣[1] 李乔[1] 

机构地区：[1]兰州文理学院化工学院,甘肃兰州730010 [2]兰州交通大学环境与市政工程学院,甘肃兰州730070

出　　处：《环境科学与管理》2014年第2期58-61,共4页Environmental Science and Management

基　　金：国家自然科学基金项目(NSFC 41363008);国家自然科学基金项目(NSFC 21067005)

摘　　要：分别利用重铬酸钾法、重铬酸钾紫外分光光度法和紫外分光光度法测定污水的COD极差分别为2．43mg／L、1．19mg／L和4．72mg／L，RE％分别为0．84％、0．53％和1．36％，重铬酸钾紫外分光光度法和紫外分光光度法的线性范围分别在0—280mg／L和0—400mg／L．结果表明：重铬酸钾紫外分光光度法测定的准确度和精密度最高，简化了用标准溶液进行标定的步骤，缩短了实验时间；紫外分光光度法测定的结果准确度和精密度相对差一些，但是快速、操作简单、节省试剂，为广大环境工作者提供借鉴参考的实例。K2Cr2O7, K2Cr2O7 -UV spectrophotometry and UV spectrophotometry methods were adopted to determine COD in sewage. The largest errors are 2. 43 mg/L,1.19 mg/L and 4.72mg/L, RE % are 0. 84%, 0. 53% and 1.36% respectively. The linear ranges of K2 Cr2O7 -UV spectrophotometry and UV spectrophotometry are 0 - 280 mg/L and 0 -400 mg/L. The results show that the method of K2Cr2O7 -UV spectrophotometry has the highest accuracy and precision, simple operations and decreasing the experiment time. The accuracy and precision of determination results using UV spectrophotometry is relatively low, but it has advantages of fast and simple operation and saving reagent. This study provides the reference example for environmental workers.

关 键 词：K2Cr O7、重铬酸钾紫外法、紫外法、COD测定 

分 类 号：X703.1[环境科学与工程—环境工程]