Design and construction of a novel optical sensor for determination of trace amounts of dysprosium ion

In this work, for the first time, a highly selective and sensitive dysprosium (Dy) optical sensor based on immobilization of N'-[(2-hydroxyphenyl)methylene] benzohydrazide (BBH) on a triacetylcellulose membrane was reported. This optode exhibits a linear range of 5.0 x 10(-7) to 8.0 x 10(-6) M of the Dy(III) ion concentration with a detection limit of 3.5 x 10(-7) M. Response time of the newly designed optode was within 30-50s, depending on the Dy(Ill) ion concentration. Response of the sensor is independent of the pH of the solution in the range of 3.0-5. The proposed optode shows low detection limit, fast response time, and most significantly, very good selectivity with respect to a number of lanthanide ions (La(3+), Ce(3+), Sm(3+), Gd(3+), Tm(3+), Ho(3+), and Eu(3+) ions). The sensor was successfully regenerated with a thiourea solution and its response was reversible and reproducible (R.S.D. less than 1.6%). This optode was applied to the determination of Dy(III) in spiked sample. (C) 2009 Elsevier B.V. All rights reserved.