2018 Volume 67 Issue 8 Pages 461-468
The quantification method of anions in water-immiscible organic solvents was examined using an in-line matrix elimination/ion chromatography (IME/IC) that utilized a concentration column method. The water-immiscible organic solvent was injected into the concentration column set on the 6-port valve to trap anions, and the residual water-immiscible organic solvent in the concentration column was washed out by flushing with pure water. The released anions from the concentration column were injected into a separation column by switching the 6-port valve, and then quantified by ion chromatography. Trace anions in the water-immiscible organic solvent were quantified with no interference based on the injection of a water-immiscible organic solvent by optimizing, the amount of pure water washing of the concentration column. The optimized method was applied to quantify anions in reagent-grade ethyl acetate, and 0.026 mg L−1 of chloride ion was determined with RSD = 3.2 %. Furthermore, the presented IME/IC method was applied to quantify anions in several water-immiscible organic solvents; it was confirmed that the presented method was valuable as a quantification method of trace anions in water-immiscible organic solvents.