4. Conclusions
The plastic optical fiber sensor presented in this paper is able to quantify TB in aqueous medium with a high level of turbidity. The interaction between the evanescent wave and the dye adsorbed on the fiber has been evidenced and plays a central role in the sensor operation. The sensor presented can be used as a tool to construct the TB on TiO2(s)adsorption isotherm in its dynamic range of concentration. The experimental data evidence the analytical system capacity to provide direct measure for concentration changes of TB in a turbid suspension without any centrifugation or filtration steps. The TB photodegradative TiO2 mediated process was clearly evidenced and kinetic information can be easily accessed.