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Finally, fluorine contents of different toothpaste samples were determined applying standard addition and linear calibration techniques. Since the samples were introduced directly as their suspensions (or dilute slurries), the results reflect their total fluorine content. As shown in Table 3, the results found by the two techniques were generally not in agreement (at least in 95% confidence level).However, in case of any significant difference, the results found by standard addition technique should be more reliable due to the non-spectral interferences originating from cross reactions of Al and F with the matrix concomitants. It should be stated that the values given by the producers on the packages of the toothpastes are only informative and cannot be used as a reference.Therefore, although not being the sole criteria for the accuracy of the our experiments, it is observed that the results were found quite close to the values given by the producers.
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