Abstract
Circulatory flow-injection methods (cyclic FIA) are reviewed for the reuse of reagents that are present in excess. The application of cyclic FIA allows the repetitive determination and monitoring of analytical species. A new concept that detection can be carried out in the presence of an “inhibitor” makes it possible to recycle of the reagent solution successfully. Moreover, regenerations of the main reagent by means of ion exchange and chelate resins are presented. Examples of repetitive determination and monitoring for strong acids and bases (copper, calcium, chloride and ascorbic acid) are given. The advantages of cyclic FIA including minimization of the reagent and waste, long-run operation, and excellent reproducibility and robustness are also presented.
