Potassium trifluoromethanesulfonate is a kind of organometallic compound, which can be used to study the mixed alkali effect and short-range interaction in polyepoxyethane electrolyte and the electrochemical behavior of glass carbon in super acid medium. The purity of potassium trifluoromethanesulfonate can be obtained by detecting the ion of trifluoromethanesulfonate by ion chromatography, which provides monitoring for the production process of the product.