摘要
我们采用国家标准方法和 CTL-1 2型仪器快速法进行对比实验 ,得到以下结论 :CTL-1 2型测定仪器的回收率在 91 %～ 1 0 3 %之间 ,一般 ,随着测定浓度增大 ,其相对标准偏差及相对误差都减小。当 COD>60 mg/L时 ,相对标准偏差小于 1 0 .0 % ,相对误差小于 6.0 % ,能满足实验要求。当 COD≤ 3 0 mg/L时 ,相对标准偏差大于2 6.0 % ,相对误差大于 1 7.5 % ,为了得到准确值 ,建议用国标法测定。
This paper summarizes both the methods and equipment which are used to determine chemical oxygen demand(COD).We compare the results of different concentration samples by using National Standard Method and Model CTL 12 instrument.The results indicate the accuracy of Model CTL 12 instrument.Relative error is less than 6.0% when COD is more than 60mg/L. Relative error is more than 17.5% while COD is under 30mg/L.RSD is less than 10.0% when COD is more than 60mg/L. RSD is more than 26.0% while COD is under 30mg/L.At the same time, the paper analyses the samples from Fangzhuang Sewage Disposal Plant.
出处
《安全与环境工程》
CAS
2002年第2期18-20,24,共4页
Safety and Environmental Engineering
基金
国家重点基础研究专项资助 :北京及周边地区环境污染机制与控制原理 (G19990 45 70 9)
