RESUMO
An electrodialyser unit has been designed, incorporated into the conduits of a flow injection (FI) system, and employed for the removal of interferences in the determination of zinc(II) in multivitamin tablets. The proposed system is fully computerised and is able to determine zinc(II) at a frequency of 18 samples/h with a sample interaction of 0.0015%. The calibration graph is linear between 1 and 20 mg/L. The detection limit is 0.998 mg/L. The results obtained for zinc(II) in multivitamin tablets with the proposed system compared favourably with those obtained with the standard manual AAS method.
Assuntos
Diálise/instrumentação , Diálise/métodos , Comprimidos/química , Vitaminas/química , Zinco/análise , Calibragem , Ferro/farmacologia , Preparações Farmacêuticas/química , Padrões de Referência , Reologia , Sensibilidade e EspecificidadeRESUMO
The viability of electrodialysis (ED) for the enhancement of mass transfer through passive neutral membranes in a flow injection system was investigated. A Spectrapore and Technicon type C membrane were evaluated using chloride anions as analyte. Both membranes showed an increase in mass transfer and the proposed electrodialyser/FIA system was applied for the determination of chloride in industrial effluents with results that compared very well with a standard titration procedure.
