Flow injection analysis dispersion coefficient

In flow injection analysis, the first index proposed for this purpose was the dilution factor, D [7], further defined as "the ratio of concentrations before and after the dispersion process has taken place in the element of fluid that yields the analytical readout" [114]. This index has also been called dispersion number, dispersion D, dispersion value, dilution ratio and dispersion coefficient [115], and the latter term has been generally accepted. Its reciprocal was called the dispersion factor [116]. The dispersion coefficient also holds for flow injection systems with reagent injection into the flowing sample [117]. 

In 1978, dispersion in flow injection analysis was classified as large (D > 10), medium (10 > D > 3) and limited (D < 3), and was solely dependent on the dispersion coefficient [39]. This classification is valid only for single-line flow systems. 

Process control—continuous and discrete analyzers, p. 661 Automatic instruments, p. 664 Flow injection analysis, p. 665 Dispersion coefficient (key equation 23.1), p. 667 Sample volume, Sy2 (key equation 23.3), p. 670 Sequential injection analysis, p. 673 Microprocessors and computers in analytical chemistry, p. 674... 

J. T. Vanderslice, G. R. Beecher, and A. G. Rosenfeld, Dispersion and Diffusion Coefficients in Flow Injection Analysis. Anal. Chem., 56 (1984) 292. 

Figure 8.5 Dispersion coefficient versus injected volume inflow injection analysis using a stirred-flow cell.

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