Abstract
Anion exchange chromatography with evaporative light scattering detection was investigated for the direct and simultaneous analysis of methyl and ethylphosphonic acids and inorganic anions in aqueous media. The chromatographic system made up of a Dionex IonPac AS4A-SC column and an aqueous mobile phase containing NH4HCO3 25 mM (pH 7.8) allows the resolution of the two phosphonic acids in less than 10 minutes without coelution of chloride, phosphate, and sulfate. This methodology has been successfully applied to the direct analysis of aqueous matrix containing low levels of phosphonic acids and high levels of inorganic anions (chloride 1700 mg/L, phosphate 1000 mg/L, or sulfate 1200 mg/L) without any baseline perturbation and matrix pretreatment. Quantitative analysis of phosphonic acids is achieved with a good correlation coefficient, and a 200 ng (200 μL of 1 mg/L) detection limit of MPA or EPA is obtainable.
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