Journal
SENSORS AND ACTUATORS B-CHEMICAL
Volume 120, Issue 1, Pages 119-124Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2006.01.050
Keywords
Er(III); ion-selective electrode; hydrazone derivative
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N '-(2-Hydroxy-1,2-diphenylethylidene) benzohydrazide (HDEBH) was found to be a suitable neutral pseudo-ionophore for the preparation of a highly selective Er(111) membrane sensor. Poly vinyl chloride (PVC)-based membranes of HDEBH with potassium tetrakis (P-chlorophenyl) borate (KTpCIPB) as an anionic additive, and dibutyl phthalate (DBP), nitrobenzene (NB), and o-nitrophenyloctyl ether (NPOE) as plasticizing solvent mediators were prepared and investigated as Er(III) sensors. A membrane composed of HDEBH-PVC-KTpCIPB-DBP with the ratio 5.0:30.0:3.0:62.0 (0.015 mmolHDEBH-30wt.%PVC-0.006 mmol additive-62% DBP) works well over a wide range (1.0 x 10(-7) to 1.0 x 10(-2) M) with a Nernstian slope of 21.0 +/- 0.5 mV per decade of activity between pH values of 3.2 and 8.9. The detection limit of the sensor was calculated to be 7.0 x 10(-8) M. The proposed electrode shows excellent discrimination toward Er(III) ions with regard to most common metal ions, and especially, all lanthanide ions (lanthanum, cerium, praseodymium, neodymium, samarium, europium, gadolinium, dysprosium, holmium, thulium, ytterbium, lutetium). To test the analytical applicability of the sensor, it was successfully used as an indicator electrode for the titration of Er(Ill) ions with EDTA. (c) 2006 Elsevier B.V. All rights reserved.
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