Abstract
Mass spectrometric evidence for the formation of (sodium-oxalate)–(NaC2O4–) and (potassium-oxalate)–(KC2O4–) ion pairs in aqueous solutions of potassium oxalate and sodium oxalate was obtained by analysing different concentrations of sodium and potassium oxalates in water containing 10% glycerol. The results suggest that fast atom bombardment mass spectrometry can be used to reveal the behaviour of ionic species in aqueous solutions. The KC2O4– and NaC2O4– ion pairs form clusters with neutral molecules of potassium oxalate and sodium oxalate and glycerol. No ion pair or cluster formation was observed when dry salts (without glycerol) were analysed. This behaviour differs from what has been observed for alkali halides under similar experimental conditions.
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