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Journal of Automatic Chemistry
Volume 17, Issue 1, Pages 17-20

Automatic calibration for on-line process monitoring in continuous-flow systems

1Department of Analytical Ckemistry, University of Córdoba, Córdoba E-14004, Spain
2Faculty of Chemistry, University of Bucharest, Bul. Carol I, Bucharest 13, Romania

Copyright © 1995 Hindawi Publishing Corporation. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


An automatic procedure for calibration in continuous-flow systems is proposed. A flow gradient unit in the sample channel, controlled via a switching valve, delivers a concentration gradient of the standard so that the standard concentration varies with time after the flow-rate gradient is started. Thus, the signal (absorbance)- concentration relationship can be determined and checked for (recalibration) as frequently as required. The procedure was applied to a simulated continuous monitoring of hydrazine in waters, as well as to specific water samples that were spiked with hydrazine at different concentrations.