Abstract
A mathematical model based on an analytical solution for the axial dispersion plug flow model is used for simulating the dispersion in flow injection analysis. The dispersion coefficients for the leading and trailing components of the profile are modeled as a function of the physical parameters of the system (reactor length, internal diameter of the reactor) and experimental conditions (flow rate and sample volume). Modeling the dispersion coefficients using all these parameters renders the model with a generality that has not been previously observed when simulating the dispersion profiles. The internal radius of the coiled manifold was observed to have a significant influence on the axial dispersion coefficient; an variable that has not been taken into account in many previous approaches. The volume of the sample plug did not significantly influence the axial dispersion coefficient. The model was set based on a spectrophotometric determination of a colored compound, bromocresol green. The full dispersion profile can be estimated for a large range of experimental conditions and the information retrieved from the simulation can be used in a rapid yet less reagent consuming optimization of the flow conditions.
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