3. Results and discussion
3.1. Analytical performance
Figure 1 A shows the visible absorption spectra for two molecular states of Toluidine Blue (TB) adsorbed on the optical fiber (solid line) and TB in solution (dash line), respectively. The spectral change, the shifting of the maximum wavelength locus from 632 nm to 565 nm, evidences that the analytical response of the optical fiber is produced by the interaction between the evanescent wave and TB adsorbed on the fiber probe resulting in an hypsochromic shift of the spectrum. Ionic strength, pH value and temperature were carefully controlled, monitored and kept constant during the experiments. Spectral changes observed cannot be explained in terms of acid-base equilibrium, neither changes given by coupled reactions; in fact, the change must be given by the immobilization of the dye molecules on the fiber surface where the environment has different electrical properties.
3. Results and discussion3.1. Analytical performanceFigure 1 A shows the visible absorption spectra for two molecular states of Toluidine Blue (TB) adsorbed on the optical fiber (solid line) and TB in solution (dash line), respectively. The spectral change, the shifting of the maximum wavelength locus from 632 nm to 565 nm, evidences that the analytical response of the optical fiber is produced by the interaction between the evanescent wave and TB adsorbed on the fiber probe resulting in an hypsochromic shift of the spectrum. Ionic strength, pH value and temperature were carefully controlled, monitored and kept constant during the experiments. Spectral changes observed cannot be explained in terms of acid-base equilibrium, neither changes given by coupled reactions; in fact, the change must be given by the immobilization of the dye molecules on the fiber surface where the environment has different electrical properties.
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