APPLICATION OF OPTICAL FIBERS IN OXIDATION-REDUCTION TITRATIONS

The paper presents recent advances in the development of an optical fi bre system for determination of the end-point in redox titration. A ne w method for reagent immobilization based on the entrapment of the mol ecules in micropores is described. This method seems to be independent of both the physical and chemical properties of the reagent. As a pra ctical application we have tested an optrode based on the use of a col ourimetric indicator. This indicator was N,N'-diphenylbenzidine. A low -cost optoelectronic system consists of a bifurcated optical fibre bun dle with a light emitting diode as a light source and a silicone photo diode as a photodetector.