Determination of Potassium in Reduced-sodium Salts by Cation Chromatography

Abstract

In this study, cation chromatography was performed to analyze high-concentration potassium contained in reduced-sodium edible salts. Regarding conditions, the eluent was set at a concentration of 30 mmol/L methanesulfonic acid, and potassium, sodium, magnesium, and calcium ions were observed to be well separated. Interference by other elements became negligible within 30 minutes. The recovery rate of potassium was 99.8-100.2 ％. In addition, good linearity was obtained in the potassium calibration curve at a concentration range of 1-50 mg/L. Validity could be confirmed from the accuracy, parallel precision of the results of this analysis method. This developed method can be applied as a rapid and effective analysis method for reduced-sodium edible salts containing high concentrations of potassium.