Chemical oxygen demand （COD） is an important index to evaluate the water pollution level. The method of potassium dichromate is used as a national standard for determination of COD in China. Chloride is the most com...Chemical oxygen demand （COD） is an important index to evaluate the water pollution level. The method of potassium dichromate is used as a national standard for determination of COD in China. Chloride is the most common interference in COD determination process. In order to solve the problem, this paper analyzes the effect of chlorine ion on the determination ofCOD in principle. And then a kind of measurement system is designed based on the structure of nanometer glass probe, which achieves rapid measurement of the concentration of chloride ions within a larger range and provides a new technical solution for improving the accuracy of the COD measurement. Alter theoretical studies and experimental verification on the distractions in the process of ion current detection, the effects of probe diameter and bias voltage on the system measuring range and sensitivity are discussed.展开更多
基金National Natural Science Foundation of China(No.61072013)
文摘Chemical oxygen demand （COD） is an important index to evaluate the water pollution level. The method of potassium dichromate is used as a national standard for determination of COD in China. Chloride is the most common interference in COD determination process. In order to solve the problem, this paper analyzes the effect of chlorine ion on the determination ofCOD in principle. And then a kind of measurement system is designed based on the structure of nanometer glass probe, which achieves rapid measurement of the concentration of chloride ions within a larger range and provides a new technical solution for improving the accuracy of the COD measurement. Alter theoretical studies and experimental verification on the distractions in the process of ion current detection, the effects of probe diameter and bias voltage on the system measuring range and sensitivity are discussed.
