摘要
在原标准回流滴定法的基础上提出了化学耗氧量（ＣＯＤ）无汞快速测定法，同时采用银—氨络合还原法对化学耗氧量测定废液中的银进行了回收。采用本方法将一次测定ＣＯＤ的时间由原来的３ｈ缩短至１ｈ，精密度实验的相对标准偏差在±４％之内，加标回收率达到９８％以上，可以满足环境监测规定的要求。
The Enviro nmental Monitoring Station of the Dalian Railway Limited liability Company (Dalian 116001) Based on the old method of back flow titration,the article puts forward the method of testing COD rapidly without mercury.At the same time the author recycles silver from spent COD test solutions with silver ammonia complexing reduction.It only takes one hour to test COD once with the new method,while taking three hours before. CV of the precision test is between -4% and +4%.Rate of recovery adding standard substance exceeds 98%.They all meet environmental monitoring standard's demands.
出处
《铁道劳动安全卫生与环保》
1998年第4期272-276,共5页
Railway Occupational Safety Health & Environmental Protection
