Analysis of Dissolved Oxygen and Nitrogen in Water

User Benefits

- Trace amounts of oxygen (O₂) and Nitrogen (N₂) contained in water can be quantified. - Both calibration curve preparation and sample analysis can be performed with an autoinjector. - Analysis at low cost is realized by using air as a substitute for standard gas.

Introduction

The amount of gas dissolved in a solution controls its functionality and the gas concentration may affect the stability and reactivity of other dissolved components. Fine bubble is a technology that makes the gas in bubbles dissolve into solution more than the saturation concentration, so it is applied to growing agricultural products and preserving the freshness of foods. Therefore, interest in analysis of gas dissolved in water is increasing. A previous Application News (01-00183) introduced the analysis of dissolved gases in the split mode using a capillary column, but the reproducibility of water analysis was not very good. In this article, the quantitation of O₂ and N₂ in water was performed using a thermal conductivity detector (TCD) and packed column, which enabled satisfactory reproducibility to be achieved.

May 16, 2022 GMT