Indirect determination of cyclamate by an on-line continuous precipitation-dissolution flow system.
A continuous-flow procedure is proposed for the indirect determination of sodium cyclamate by an atomic absorption spectrometric method in artificial sweeteners mixtures and soft drinks. Sulfamic group is oxidized to sulfate and it is continuously precipited with lead ion in a flow manifold. The lead sulfate formed is retained on a filter, washed with diluted ethanol and dissolved in ammonium acetate for on-line atomic absorption determination of lead, the amount of which in the precipitate is proportional to that of cyclamate in the sample. The proposed method allows the determination of sodium cyclamate in the range 1-90 mug ml(-1) with a relative standard deviation of 3.1% at a rate of ca. 35 samples per h. The 3sigma detection limit is 0.25 mug ml(-1). The method is very selective, no compounds normally found in the analysed samples and other artificial sweeteners had any effect on the determination of cyclamate.
Yebra
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MC
Department of Analytical Chemistry, Nutrition and Bromatology, Chemistry Faculty, University of Santiago, 15706-Santiago de Compostela, Spain.
Bermejo
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