Lanthanide Recognition: Development of an Asymetric Gadolinium Microsensor Based on N-(2-pyridyl)-N'-(4-nitrophenyl)thiourea

作者：Faridbod Farnoush; Ganjali Mohammad Reza^*; Labbafi Sharareh; Norouzi Parviz

来源：Analytical Letters, 2008, 41(16): 2972-2984.

DOI：10.1080/00032710802440525

• Gd(III)
• microsensor
• N-(2-pyridyl)-N'-(4-nitrophenyl)thiourea
• potentiometric membrane

The first asymmetric potentiometric Gd(III) microsensor is reported here. N-(2-Pyridyl)-N'-(4-nitrophenyl)thiourea (PyTu4NO2) was found to have a very selective and sensitive behavior toward Gd(III) ions, in comparison to other lanthanide ions as well as inner transition and representative metal ions and hence was used as a sensing material in the construction of a Gd(III) microelectrode. The Gd(III) sensor exhibits a Nernstian slope of 17.460.3mV per decade over the concentration range of 1.010-8 to 1.010-3 M and a detection limit of 3.010-9 M of Gd(III) ions. The potentiometric response of the sensor is independent of the solution pH in the range of 4.0-9.0. It manifests advantages of low detection limit and fast response time (10-15s).

• 出版日期2008