Abstract
An approach to calculating the rate of entropy production in a system was developed to characterize the stationary state in flow-injection systems on the basis of principles of nonequilibrium thermodynamics, and its relationship to the parameters of the measured peak was found. Thus, it became possible to make quantitative relative estimations in real systems. By the example of a classical flow-injection spectrophotometric determination of uranium with Arsenazo III, it was shown that the rate of entropy production can be estimated from experimental data. It was found that the peak-averaged rate of entropy production decreases with concentration. It was found that, at the moment of the measurement of the peak maximum, this value is actually minimum and nonzero, and the nonlinear dependence corresponds to the best calibration function because of the effect of nonequilibrium factors.
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