化学需氧量测定影响因素分析与探讨  

ANALYSIS AND DISCUSSION ON THE FACTORS INFLUENCING THE DETERMINATION OF CHEMICAL OXYGEN DEMAND

作　　者：牛新征[1] 

机构地区：[1]中国石油化工股份有限公司洛阳分公司,河南洛阳471012

出　　处：《石油化工安全环保技术》2017年第2期49-52,共4页Petrochemical Safety and Environmental Protection Technology

摘　　要：对水质监测中影响化学需氧量测定的主要因素进行了探讨,通过实验确定了提高化学需氧量测定结果准确性的措施与条件。实验结果表明:在取样过程中摇匀样品,在试样中加入0.4 g硫酸汞、0.250 0 mol/L重铬酸钾溶液、硫酸-硫酸银溶液30 m L并控制加热回流时间为2 h,可提高分析数据准确度,使结果真实反映样品实际。This paper discusses the main factors influencing the determination of chemical oxygen demand(COD)in water quality monitoring.Through experiments,the measures and conditions to improve the accuracy of determining chemical oxygen demand are confirmed.The experimental results show that the accuracy of analysis data can be improved by shaking the sample during sampling,adding 0.4g of sulfuric acid,0.2500mol/L potassium dichromate solution and 30 ml acid-silver sulfate solution in the sample and controlling the heating reflux time to be 2 h.In this way,the results can reflect the actual sample.

关 键 词：化学需氧量测定 影响因素分析 重铬酸钾法 

分 类 号：X832[环境科学与工程—环境工程]