Development of Analysis Method for Total Nitrogen Using a Copper-zinc Reduction Coil by Continuous Flow Analysis

Abstract

We developed an analysis method for total nitrogen using a copper-zinc reduction coil without cadmium by continuous flow analysis. In this study, we attempted to realize a total nitrogen analysis method without using harmful substances by combining the previously reported nitric acid analysis method using a copper-zinc reduction coil and by decomposition using potassium peroxodisulfate. The coefficient of determination was 0.9996, and the instrument limit of detection and the method limit of quantification were lower than the limit of quantification required for the measurement of environmental water and wastewater. In the analysis of environmental water and wastewater samples by this method, we were able to obtain results equivalent to those obtained by the conventional method. In addition, we conducted measurements at three facilities. Repeatability relative standard deviation was lower than 10%, suggesting the validity of this method.