Fiber-optic sensor for iodine based on a covalently immobilized aminobenzanthrone Schiff base.
An aminobenzanthrone Schiff base has been synthesized as a new fluorescence carrier for the preparation of an optical chemical sensor for iodine. The response of the sensor is based on fluorescence quenching of the aminobenzanthrone Schiff base by iodine. The sensor shows a linear response toward iodine in the range of 1.0 x 10(-5) to 1.0 x 10(-3) mol l(-1), with a detection limit of 6.0 x 10(-6) mol l(-1) at pH 8.0. Leaching of the fluorophore from the membrane is effectively hindered by covalent immobilization, resulting in an enhanced sensor lifetime. In addition to satisfactory reproducibility and reversibility, the prepared sensor exhibits sufficient selectivity toward iodine with respect to other coexisting ions. The sensor has been applied to the determination of iodine in common salt samples.
Chen
Li-Xin
LX
Department of Chemistry and Chemical Engineering, Hunan Institute of Engineering, Xiangtan 411104, P.R. China. lxchen@21cn.com
Niu
Cheng-Gang
CG
Xie
Zhi-Min
ZM
Long
You-Qian
YQ
Song
Xin-Rong
XR
D000873:Anthracenes / Q000138:chemical synthesis / Q000737:chemistry*; D005336:Fiber Optic Technology; D006863:Hydrogen-Ion Concentration; D007455:Iodine / Q000032:analysis*; D015394:Molecular Structure; D055100:Optical Fibers; D012545:Schiff Bases / Q000138:chemical synthesis / Q000737:chemistry*; D012680:Sensitivity and Specificity; D013050:Spectrometry, Fluorescence / Q000379:methods; D013997:Time Factors
D000873:Anthracenes; D012545:Schiff Bases; C516993:aminobenzanthrone; D007455:Iodine