INFLUENCE OF DIFFERENT VOLUME RATIOS ON THE ISODISPERSION POINT IN SEQUENTIAL INJECTION-ANALYSIS

The importance of zone penetration can be ascribed to the fact that th is influence has a dramatic effect on the surface area over which a co ncentration gradient exists and therefore over which axial mixing take s place. In this study different volume ratios were used to illustrate the shift of the isodispersion point due to the difference in concent ration gradients in sequential injection analysis (SIA). The position of penetration and the sequence of introduction of samples and reagent s for different sample and reagent volume ratios in a total constant v olume has a major influence on the response of the final peak profile. The response of the final peak profile depends largely on the kinetic s involved in both the ascending and tailing parts of the sample and r eagent zones at the isodispersion point. (C) 1997 Elsevier Science B.V .