Fiber optic sensor for the continuous measurement of carbon tetrachloride vapors

Ashutosh Sharma; Oliver William Carter

doi:10.1117/12.261001

10 December 1996 Fiber optic sensor for the continuous measurement of carbon tetrachloride vapors

Ashutosh Sharma, Oliver William Carter

Proceedings Volume 2836, Chemical, Biochemical, and Environmental Fiber Sensors VIII; (1996) https://doi.org/10.1117/12.261001
Event: SPIE's 1996 International Symposium on Optical Science, Engineering, and Instrumentation, 1996, Denver, CO, United States

Abstract

An optical sensor for carbon tetrachloride measurement has been developed that utilizes a covalently bound fluorescent indicator. In methanol solution the quenching of the indicator by CCl₄ followed Stern-Volmer kinetics (k_q equals 9.9 multiplied by 10⁹ M^-1s^-1), suggesting a diffusion-controlled process. Solutions we also quenched by other chlorocarbon compounds, e.g. perchloroethylene. Once immobilized, the indicator behavior coupled with the preferential adsorption of CCl₄ by the porous substrate offered selective measurement of carbon tetrachloride. The sensitivity of the sensor varied with concentration according the the adsorption isotherm, with a linear Stern-Volmer plot (K_sv equals 1000 M^-1) up to an analyte concentration of 100 (mu) M (2400 ppm v/v). The sensor offers a detection limit of 20 (mu) M (480 ppm v/v), the equivalent of a 3.0 (mu) M (460 ppb v/v) aqueous solution headspace. A sensor for fiberoptic based monitoring of carbon tetrachloride is discussed.

Citation Download Citation

Ashutosh Sharma and Oliver William Carter "Fiber optic sensor for the continuous measurement of carbon tetrachloride vapors", Proc. SPIE 2836, Chemical, Biochemical, and Environmental Fiber Sensors VIII, (10 December 1996); https://doi.org/10.1117/12.261001

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