A Fiber Optic Sensor for 2,4-dichlorophenol Analysis based on Optical Composite Oxygen-sensitive Film
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https: //doi. org/10.1007/s11595-020-2316-3
A Fiber Optic Sensor for 2,4-dichlorophenol Analysis based on Optical Composite Oxygen-sensitive Film TONG Yilin, ZENG Zhihong, YU Kan*, BAO Jiaqi, YIN Juanjuan (Information Science and Technology Department, Wenhua College, Wuhan 430074, China)
Abstract: A novel fiber optic sensor based on optical composite oxygen-sensitive film was developed for determination of 2,4-dichlorophenol (DCP). The optical composite oxygen-sensitive film consists of tris(2,2’-bipyridyl) dichloro ruthenium(II) hexahydrate (Ru(bpy)3Cl2) as the fluorescence indicator and iron(III) tetrasulfophthalocyanine (Fe(III)PcTs) as bionic enzyme. A lock-in amplifier was used for detecting the lifetime of the composite oxygen-sensitive film by measuring the phase delay of the sensor head. The different variables affecting the sensor performance were evaluated and optimized. Under the optimal conditions (i e, pH 6.0, 25 ℃, Fe(III)PcTs concentration of 5.0×10-5 mol/L), the linear detection range, detection limit and response time of the fiber optic sensor are 3.0×10-7-9.0×10-5 mol/L, 4.8×10-8 mol/L(S/N=3), and 220 s, respectively. The sensor displays high selectivity, good repeatability and stability, which have good potentials in analyzing DCP concentration in practical water samples. Key words: 2, 4-dichlorophenol; optical composite oxygen-sensitive film; fiber optic sensor; phase delay
1 Introduction Chlorinated phenols are widely used in the manufacturing of pharmaceuticals, resins and plastics, coal refineries, painting, pulp and paper, pesticides, herbicide and even from food processing industries[1-3]. They have become primary pollutants of various industries. 2,4-dichlorophenol(DCP) is of particular interest since it is a precursor for the synthesis of carcinogenic endocrine, 2,4-dichlorophenoxyacetic acid, which is the active ingredient of more than 1500 herbicides. The toxicity linked to DCP exposure has been evidenced to cause endocrine related cancers and chronic conditions such as chloracne and porphyria in humans[4,5]. Due to the toxic properties, the detection of DCP in water or soil have an important significance to human health and natural environment[6-8]. Several methods have been used for the determination of DCP including the gas chromatography[9,10], flow injection analysis[11], HPLC[12], photocatalysis[13], electrode[14],
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© Wuhan University of Technology and Springer-Verlag GmbH Germany, Part of Springer Nature 2020 (Received: Sept. 17, 2019; Accepted: Dec. 18, 2019) TONG Yilin(童伊琳): Assoc. Prof.; Ph D; E-mail: T111L@126.
*Corresponding author: YU Kan(俞侃): Prof.; Ph D; E-mail: [email protected] Funded by the National Natural Science Foundation of China (No. 61205062), and the Scientific Research Foundation for Doctor of University (No. 2019Y02)
and electrochemical sensor [15,16] . However, these methods have many deficiencies, such as high cost, complicated sample preparation, difficult operation and impossibility of online detection[17,18]. The fiber optic sensor have
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