Development of Quantitative Analysis Method for Sodium Peroxide in Sodium Combustion Residue

Abstract

To investigate the behavior of a sodium leakage fire and evaluate the fire risk, it is necessary to estimate quantitatively the sodium peroxide content in the sodium combustion residue. As the physical and chemical properties of sodium combustion residue are considerably different from the sodium peroxide reagent, it is necessary to verify whether a general method of the quantitative analysis intended for the sodium peroxide reagent is applicable to the analysis of the sodium combustion residue. For this purpose, we first analyzed the sodium peroxide reagent and sodium combustion residue generated under different atmosphere conditions using the potassium permanganate oxidation-reduction titration method and hydrolysis method respectively, and compared the obtained results. Next, we examined whether the oxygen generated from the sample was completely detected in the analysis process of each analysis method. Further, we investigated the cause of the incomplete detection of the generated oxygen in the analysis process of the combustion residue by the potassium permanganate oxidation-reduction titration method established in JIS K8231. From these results, we conclude that JIS K8231 is an improper method to the analysis of the sodium combustion residue and propose the application of the hydrolysis method with the analysis of the residual liquid to the analysis of the sodium combustion residue.