Standard additions in flow injection analysis with atomic absorption spectrometry

A standard additions method in flow injection atomic absorption analysis has been described. The proposed method was applied to the determination of calcium in synthetic samples with and without chemical interference and the results were compared with those obtained by the conventional standard additions method in atomic absorption spectrometry. The influence of parameters of the flow injection system was studied. The results showed that the proposed method was independent of such parameters. The relative standard deviations within and between analyses were found to be 1.61 and 1.81%, respectively, at the 1.5 μg ml−1 Ca level. The method was used for the determination of calcium in tap water.