高氯废水化学需氧量测定方法研究进展
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摘要
化学需氧量(COD)是指水体中易被强氧化剂氧化的还原性物质所消耗氧化剂的量,它反映了水中受还原性物质污染的程度。目前COD值的测定普遍采用国标重铬酸盐法(GB/T11914-89),但用这种方法测定高氯废水时存在较大误差,这为环境执法带来一定困扰,如何消除氯离子对COD值的干扰已成为环境监测工作者关注的热点。文章从测定原理、消除效果、适用范围等方面对国内外现行国家标准、行业标准以及改进方法进行了探讨,提出现有高氯废水COD测定方法中存在的问题和今后的研究展望。
Chemical oxygen demand(COD) is the amount of oxidant consumed by a reducing substance that is easily oxidized by a strong oxidant in a water body, and it reflects the degree of contamination of the water by reducing substances. At present, the national standard dichromate method(GB/T 11914-89) is generally used for the determination of COD value. However, there is a large error in the determination of high-chlorine wastewater by this method, which brings some troubles to environmental law enforcement. How to eliminate chloride ion Interference with COD values has become a hot spot for environmental monitoring workers. The article discusses the current national standards, industry standards and improvement methods from the aspects of measurement principle,elimination effect and scope of application, and puts forward the problems existing in the current COD determination method of high-chlorine wastewater and future research prospects.
Chemical oxygen demand(COD) is the amount of oxidant consumed by a reducing substance that is easily oxidized by a strong oxidant in a water body, and it reflects the degree of contamination of the water by reducing substances. At present, the national standard dichromate method(GB/T 11914-89) is generally used for the determination of COD value. However, there is a large error in the determination of high-chlorine wastewater by this method, which brings some troubles to environmental law enforcement. How to eliminate chloride ion Interference with COD values has become a hot spot for environmental monitoring workers. The article discusses the current national standards, industry standards and improvement methods from the aspects of measurement principle,elimination effect and scope of application, and puts forward the problems existing in the current COD determination method of high-chlorine wastewater and future research prospects.
引文
[1]刘娟,吴浩宇.高氯废水COD测定方法的探究[J].工业水处理, 2011, 31(4):66-69.
[2]王俊荣.高氯离子低浓度化学需氧量水样测定方法的研究[D].山东济南:山东大学, 2005. 4-5, 31-34.
[3]王耘.一种高氯废水化学需氧量的测定及K值确定[J].科技致富向导, 2009(9):34-35.
[4]陈东顺.氯离子对COD测定的干扰机校正方法的研究[J].化工环保, 2002, 14(1):33-38.
[5]易春叶,林亲铁.高氯废水COD测定中消除Cl-干扰的方法探讨[J].广东化工, 2012, 37(7):166-168.
[6]李桂华.悬浮物SS和化学需氧量CODCr的相关性研究[J].环境科学与技术, 1997(1):37-40.
[2]王俊荣.高氯离子低浓度化学需氧量水样测定方法的研究[D].山东济南:山东大学, 2005. 4-5, 31-34.
[3]王耘.一种高氯废水化学需氧量的测定及K值确定[J].科技致富向导, 2009(9):34-35.
[4]陈东顺.氯离子对COD测定的干扰机校正方法的研究[J].化工环保, 2002, 14(1):33-38.
[5]易春叶,林亲铁.高氯废水COD测定中消除Cl-干扰的方法探讨[J].广东化工, 2012, 37(7):166-168.
[6]李桂华.悬浮物SS和化学需氧量CODCr的相关性研究[J].环境科学与技术, 1997(1):37-40.