Abstract
Fluoride concentrations in Dutch rain water samples were determined by three different analytical techniques, i.e., (i) capillary electrophoresis (CE), (ii) ion chromatography (IC) and (iii) ion-selective electrode potentiometry (ISE). Performance characteristics in terms of precision, limit of detection and run time have been obtained for the three applied methods using standard solutions in the range of 0.5 to 10.0 μmol l −1. Limits of detection were found to be similar for IC and ISE (0.2 and 0.3 μmol l −1, respectively) and somewhat higher for CE (0.6 μmol l −1). Statistical analysis of the fluoride concentrations in rain water samples as obtained by CE, IC and ISE indicated that there was no evidence for systematic differences between CE and ISE, whereas the fluoride concentrations obtained by IC were significantly higher. The observed differences are most likely due to the presence of aluminium cations.
Published Version
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