10 December 1996 Fiber optic sensor for the continuous measurement of carbon tetrachloride vapors
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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 (kq 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 (Ksv 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.
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Ashutosh Sharma, Ashutosh Sharma, Oliver William Carter, 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); doi: 10.1117/12.261001; https://doi.org/10.1117/12.261001
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