紫外分光光度法测定水质COD 的技术研究.doc

文档介绍：紫外分光光度法测定水质COD的技术研究
张国强第一作者:张国强,男,1980年生,硕士研究生,研究方向为环境工程。
康戈文黄建国任文伟
(电子科技大学自动化工程学院,四川成都 610054)
摘要紫外分光光度法测定水质COD是利用有机物吸收紫外线的特征来测量水中的有机物浓度。用邻苯二甲酸氢钾标准溶液作为水样,验证了水样中COD与254 nm紫外线的吸光度之间在一定范围内有良好的线性关系。线性回归方程为y=- 5,相关系数r= 5。由于一般污水中有悬浊物的影响,因此研究了采用可见分光光度法补偿浊度影响的可行性。
关键词 COD 浊度补偿吸光度 UV
Research on UV spectrophotometry for determination of COD in water Zhang Guoqiang, Kang Gewen, Huang Jianguo, Ren Wenwei (School of Automation Engineering, University of Electronic Science and Technology of China, Chengdu Sichuan 610054)
Abstract: The determination of COD in water by ultraviolet spectrophotometry was to measure the concentration anic substance based on the feature anic substance could absorb ultraviolet. This paper had used potassium hydrogenphthalate(C8H5O4K) standard solution as sample water to test that there was better linear relationship between the COD of sample water and the absorbency of solution at 254 nm. The linear regression equation and correlation coefficient was y=- 5 and r=. Because there was the effect of turbidity, this paper studied the feasibility using visible spectrophotometry pensate the effect above.
Keywords: COD pensate Absorbency UV
现代社会环境污染尤其是水污染是迫切需要解决的问题之一。COD[1]是指在一定条件下,氧化1 L水样中还原性物质所消耗的氧化剂的量,以氧的mg/L表示。COD反映了水体受还原性物质污染的程度。COD作为河流和工业废水的研究及污水处理厂的一个重要的参数受到各个国家的重视。测定COD的方法主要有化学法和物理法,化学法是以各种化学反应为基础,物理法则主要是分光光度法。目前, 我国测定