Abstract
To improve the sensitivity of the analysis method for 1,4-dioxane using Headspace-GC/MS, we developed a highly sensitive analysis method using sodium hydroxide as a salting-out reagent.
When 3g of sodium hydroxide was added as a salting-out reagent, the amount of 1,4-dioxane in the gas phase increased approximately 9.3 times more than when 3g of sodium chloride was added. So, after the addition of 5mL of 600g/L sodium hydroxide and surrogate to 5mL of sample water, 1,4-dioxane was measured using Headspace-GC/MS. The method detection limit (MDL) of this method was 0.095-0.124μg/L and the method quantification limit (MQL) was 0.244-0.322μg/L. This MQL was an improvement of more than six times compared to conventional methods. Overall recoveries were good (almost 100%) at each concentration (2, 5, 10μg/L).
Measured values of 1,4-dioxane in samples such as leachate from landfill by this method were in good agreement with those measured by the official method. Therefore, this method was found to be useful for the analysis of 1,4-dioxane in real samples.
