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A fiber optic 2-cholrophenol(2-CP) sensor was developed based on the fluorescence quenching of molecular oxygen on the oxygen-sensitive membrane and O2 consumption during catalytic oxidation reaction of 2-CP. The 2-CP concentration can be determined by utilizing a lock-in amplifier 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)3Cl2) 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 1×10-7 to 1×10-5 mol/L and 1×10-5 to 1×10-4 mol/L. The detection limit of the sensor is 7×10-8 mol/L(S/N=3) and the response time is 5 min. Our experimental measurements confirmed good response characteristics of the as-prepared fiber optic 2-CP sensor, as well as its capability to detect the 2-CP concentration in practical water samples.
A fiber optic 2-cholrophenol (2-CP) sensor was developed based on the fluorescence quenching of molecular oxygen on the oxygen-sensitive membrane and O2 consumption during catalytic oxidation reaction of 2-CP. The 2-CP concentration can be determined by utilizing a lock-in amplifier to measure the change in the fluorescence lifetime of an oxygen-sensitive membrane, wherein the tris (2,2’-bipyridyl) ruthenium (II) chloride complexes (Ru (II) (byp) 3Cl2) 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 1 × 10-7 to 1 × 10-5 mol / L and 1 × 10 -5 to 1 × 10 -4 mol / L The detection limit of the sensor is 7 × 10 -8 mol / L (S / N = 3) and the response time is 5 min. good response characteristics of the as-prepared fiber optic 2-CP sensor, as well as its capability to detect the 2-CP concentration i n practical water samples.