Optochemical fiber sensor for Toluidine Blue detection in high turbidity media

BENAVENTE VICTORIA; BARUZZI ANA M.; IGLESIAS RODRIGO

SENSORS AND ACTUATORS B-CHEMICAL

ELSEVIER SCIENCE SA

Lugar: Amsterdam; Año: 2015 vol. 216

0925-4005

We report the analytical performance of an optochemical fiber optic sensor for the detection of dyes inaqueous media with high turbidity. Specifically, the analytical performance of this sensor was evaluatedfor the quantitative detection of Toluidine Blue (TB) in aqueous solution and also in turbid suspensionsof TiO2 anatase nanoparticles. The detection limit attained was 5 × 10−7 M with a linear sensitivity of7 × 104 M−1 across a linear range from 5 × 10−7 to 5 × 10−6 M. We used the optochemical sensor for twomain purposes: (1) in situ characterization of the adsorption isotherm of Toluidine Blue on TiO2 nanoparticles;(2) in situ characterization of the photodegradation of Toluidine Blue mediated by UV irradiationof TiO2 nanoparticles. The main aim of this report is to establish the construction and performanceof a simple, cheap and small optochemical sensor with clear applications in the field of dye-pollutedenvironmental monitoring.