Lanthanide Recognition: an Asymetric Erbium Microsensor Based on a Hydrazone Derivative

Farnoush Faridbod; Mohammad Reza Ganjali; Bagher Larijani; Parviz Norouzi; S Riahi; F Fatemeh Sadat Mirnaghi

doi:10.3390/s7123119

Lanthanide Recognition: an Asymetric Erbium Microsensor Based on a Hydrazone Derivative

Sensors (Basel). 2007 Dec 5;7(12):3119-3135. doi: 10.3390/s7123119.

Authors

Farnoush Faridbod¹, Mohammad Reza Ganjali², Bagher Larijani³, Parviz Norouzi¹, S Riahi⁴, F Fatemeh Sadat Mirnaghi¹

Affiliations

¹ Center of Excellence in Electrochemistry, Faculty of Chemistry, University of Tehran, Tehran, Iran.
² Center of Excellence in Electrochemistry, Faculty of Chemistry, University of Tehran, Tehran, Iran. ganjali@khayam.ut.ac.ir.
³ Endocrinology & Metabolism Research Center, Medical Sciences/ University of Tehran, Tehran, Iran.
⁴ Institute of Petroleum Engineering, Faculty of Engineering, University of Tehran, Tehran, Iran.

Abstract

N'-(2-hydroxy-1,2-diphenylethylidene)benzohydrazide (HDB) was found tohave a very selective and sensitive behavior towards erbium(III) ions, in comparison tothirteen lanthanide ions, inner transition and representative metal ions and was hence usedas a neutral ion carrier in construction of an Er(III) microelectrode. Theoretical calculationsand conductance studies of HDB to erbium and some other metal ions were carried out andconfirmed selectivity toward Er(III) ions.The best performance was obtained with a membrane contain 3% potassium tetrakis(p-chlorophenyl)borate (KTpClPB) as an anionic additive, 72% dibutyl phthalate (DBP) assolvent mediator, 5% HDB, and 20% poly(vinyl chloride) (PVC). The proposed Er(III)microelectrode exhibits a near Nernstian response of 17.5±0.5 mV per decade of erbiumactivity, and a very wide linear range 1.0×10^-3-3.0×10^-10 M. It can work well in the pHrange of 3.0-9.0. The lower detection limit (LDL) of the microelectrode was calculated tobe 2.0×10^-10 M.

Keywords: Er(III); Hydrazone derivative; Microelectrode; Potentiometry; Sensor.