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Journal of Automatic Chemistry
Volume 14 (1992), Issue 3, Pages 101-105

A versatile injection system for flow-injection analysis

1Laboratoire de Tkermorégulation et Energétique de l'Exercice, CNRS URA 1341, Faculté de Médecine, 8, Avenue Rockefeller, Lyon Cedex 08 69373, France
2Laboratoire de Chimie Analytique Instrumentale, Faculté de Pharmacie, 8, Avenue Rockefeller, Lyon Cedex 08 69373, France

Copyright © 1992 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.


Analyser injection systems based on the principle of flow-injection analysis depend on the technique used. They generally take the form of an injection loop valve; the injected sample volume is determined by the volume of the valve. Injection systems are seldom designed with a time factor to define this volume. The authors report on an original injection system, which enables the two techniques to be used. The paper describes the evaluation of this system using both injection techniques and the comparison between them. The results show good linearity (r = 0.999 to 1.000) and an average precision (CV = 1.04 to 1.51%) for the volume-based injection technique; (ii) good linearity (r = 1.000) and better precision (CV = 0.73 to 1.30%) for the time-based injection technique. The system can be used equally well by the loop and by the clock; however, the latter is preferable because of its practicability.