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|Title:||A dynamic electrochemical sensor for europium(III)|
|Abstract:||A new calixarene derivative, i.e<i style="">.</i>, <i>p-tert</i>-butylcalixarene has been used as an excellent ionophore in the construction of a novel PVC based Eu(III)-selective electrode. A master membrane with percentage composition of PVC:DBP:L: NaTPB:: 32:55:4:9 gives the best results. The membrane electrode exhibits a nernstian response with the slope of 19.7±1.0 mV/decade over a wide concentration range of 9.1 × 10<sup>-8</sup>-1.0 × 10<sup>-1 </sup><i style="">M</i> and with detection limit of 8.8 × 10<sup>-8</sup> <i style="">M</i>. The effects of membrane composition and <i style="">p</i>H as well as the influence of the anionic additive on the electrode performance have been investigated. The potential response of the resulting sensor is not influenced in the <i style="">p</i>H range 3.0-9.0. Moreover, the membrane electrode has a good reproducibility (RSD 3%), very fast response time (5 s) and ability to detect Eu(III) among other rare earth metal and common cations. The membrane sensor works satisfactorily up to 40% non-aqueous medium and can be used over a period of 6 months. The sensor has been successfully applied for the determination of Eu(III) in analytical and biological samples (urine and serum) and also acts as an electrode indicator.|
|Appears in Collections:||IJC-A Vol.49A(10) [October 2010]|
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|IJCA 49A(10) 1325-1331.pdf||170.24 kB||Adobe PDF||View/Open|
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