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摘要
A new method has been proposed for fast determination of hexafluorophosphate (PF6-) and some inorganic anions (F-, Cl-, NO3-, SO42-). It was accomplished by valve switching between anion exchange guard column and separation column connected in series. With strong retentive ion (PF6-) only through guard column and the inorganic anions through both guard column and separation column, the separation was completed within a much shorter time. Under the optimum conditions, the linear ranges of the method for PF6-, F-, Cl-, NO3- and SO42- were 1-200 mg/L (r=0.9997), 0.1-25 mg/L (r=0.9995), 0.1-5 mg/L(r=0.9997), 0.1-5 mg/L(r=0.9997) and 0.1-5 mg/L(r=0.9999), whereas detection limits calculated at S/N=3 were 8.90, 0.41, 0.44, 1.23 and 1.20 mu g/L, respectively. The recoveries were in the range of 86.5%-112.2% with the relative standard deviations of 1.4%-4.1%. The method could be applied to determine strong retentive and weak retentive ions simultaneously.
