水样的代表性和滴定剂浓度对重铬酸钾法测定化学需氧量的影响  

Effect of Sample Representativeness and Titrant Concentration on Determination of COD in Potassium Dichromate Test

作　　者：张洪 

机构地区：[1]通州市环境监测站,江苏通州226300

出　　处：《四川环境》2009年第1期41-42,共2页Sichuan Environment

摘　　要：化学需氧量测定中,样品的代表性和滴定的误差直接影响结果的准确性。采用水浴超声器均化水样,可提高样品的代表性,通过调整滴定液硫酸亚铁铵标准溶液的浓度,可以减小滴定的误差,从而提高结果的准确性。In determination of COD, the representativeness of water sample and the titration inaccuracy directly affect the accuracy of the result. The sample representativeness could be enhanced by ultrasonic homogenization in water-bath; and the titration inaccuracy could also be minimized by adjusting the concentration of the ferrous ammonium sulphate in the standard solution. Therefore the accuracy of determination could be improved.

关 键 词：化学需氧量 样品代表性 重铬酸钾法 

分 类 号：X832[环境科学与工程—环境工程]