Influence of single bead string reactors on zone penetration and the isodispersion point in sequential injection analysis

A non-reactive dye was used to investigate the effect, that a single bead s tring reactor (SBSR) has upon the isodispersion point and the degree of zon e penetration of the "sample" and "reagent" zones in a simple sequential in jection system. The length of SBSR, the pump speed (flow rate) and the volu me ratios of both the sample and reagent zones in a total constant volume w ere parameters that were studied with the SBSR at one of two positions, eit her before the detector or between the selection valve, and the holding coi l.