A Fiber Optic Sensor for 2-cholrophenol Analysis based on Oxygen Sensing System

A fiber optic 2-cholrophenol (2-CP) sensor was developed based on the fluorescence quenching of molecular oxygen on the oxygen-sensitive membrane and O-2 consumption during catalytic oxidation reaction of 2-CP. The 2-CP concentration can be determined by utilizing a lock-in amplifi er to measure the change in the fluorescence lifetime of an oxygen-sensitive membrane, in which the tris (2,2'-bipyridyl) ruthenium(II) chloride complexes (Ru(II)(byp)(3)Cl-2) were immobilized in cellulose acetate (CA) via simple hybridized approach. The experimental results show the good linear relationship between the phase delay of sensitive membrane and 2-CP concentration in its detection range of 1x10(-7) to 1x10(-5) mol/L and 1x10(-5) to 1x10(-4) mol/L. The detection limit of the sensor is 7x10(-8) mol/L (S/N=3) and the response time is 5 min. Our experimental measurements confi rmed good response characteristics of the as-prepared fi ber optic 2-CP sensor, as well as its capability to detect the 2-CP concentration in practical water samples.