POLYMER TRACK MEMBRANES AS A TRAP SUPPORT FOR REAGENT IN FIBER OPTIC SENSORS

The article presents a new idea of the application of polymer track me mbranes (PTM) for immobilization of a reagent in fiber optic chemical sensors. PTM was made of a poly(ethylene terephthalate) foil (10 mu m in thickness, pores of 0.2 mu m in diameter). The usefulness of membra nes additionally covered by poly(vinyl chloride) was tested in a fiber optic redox titrator. The titrator utilized N,N'-diphenylloenzidine a s a reagent which changes its absorbance in dependence on the redox po tential. The measuring system is based on a light-emitting diode and a silicon photodiode connected to a bifurcated fiber optic bundle. The gain is in price and availability of the membrane. (C) 1996 John Wiley & Sons, Inc.