Using a new ionophore and nano materials for design and fabrication of novel chemicaly modified carbon paste electrode for response of a potentiometric sensor to Nd(III)

Nowadays, determination of rare-earth compounds is considered necessary because of the increasing interest in bioinorganic and inorganic chemistry, increased industrial use, and also dueto their enhanced discharge, toxic properties, and other adverse effects [1]. Neodymium is thesecond most abundant rare earth element [2]. In this study a high sensitivity potentiometricmethodology, using a novel chemicaly modified carbon paste electrode for determination ofNd(III) in aqueous solution was investigated. For modification of the electrode a typically room temperature ionic liquid was applied as a high conductive binder, and Multi-walled carbon nanotubes (MWCNTs) were used in the structure of the carbon paste to improve conductivityand transduction of chemical signal to electrical signal, and nanosilica particles were used into this electrode to improve of the response and mechanical resistant of the electrode [1, 3,4]. Moreover, a new neodymium(III)-selective ligand was incorporated as an ionophore to thiscomposition caused to significantly enhanced selectivity toward Nd(III) over a wide concentration range of 5.00×10-8-1.00×10-1 M with a low detection limit of 1.00×10-8 M and a Nernstian slope of (19.38±0.1 mV decade-1). The potentiometric response of prepared sensor isindependent of the pH of test solution in the pH range 3.5 to 7.0. A fixed interference methodindicated that the electrode has an excellent selectivity for Nd(III) ions over alkali, alkaline earth and other heavy metal ions. The electrode can be used to accurately monitor the Nd(III) pollutionin environmental waters.

کلیدواژه ها:

Carbon paste electrode ، Nd(III) ، Multi-walled carbon nanotubes ، Nanosilica ، Ionic liquids ، Potentiometric sensor