Optical device for the measurement of chlorocarbon vapors

摘要

Abstract: An optical device for monitoring of volatile aliphatic chlorocarbons based on the measurement of fluorescence quenching of an indicator molecule that forms part of the sensing element is reported. Chlorocarbon vapors present in air mixture or in the water when in contact with the fluorescent indicator immobilized in a polymer film cause a quantitative decrease in the fluorescence intensity. The sensor offers response time of ca. 100 s, and recovery times, governed by diffusion of the analyte in the polymer film, are less than 100 s for measurement in air. A higher response time was observed for carbon tetrachloride saturated water. Detection limits less than ppm were obtained. !9