Lanthanum(III) Ion Selective Electrode Based on a New Ionophore

Journal of Physical Chemistry & Eleectrochemistry

مقاله 4، دوره 3، شماره 2، مهر و آبان 2015، صفحه 189-194   

نوع مقاله: Research Paper

تاریخ دریافت: 20 مهر 1392،  تاریخ پذیرش: 20 مهر 1392 

چکیده

A PVC membrane electrode based on 1-[({[(butylsulfunyl)carbothioyl]disulfanyl} carbothioyl)sulfanyl]
butane as a suitable ion carrier for determination of lanthanum(III) ion was prepared. This electrode revealed
such a good selectivity toward La3+ ion over a wide variety of other metal ions. Some experimental parameter
such as membrane composition, nature, and amount of plasticizer, the amount of additive, and concentration
of internal solution on the potential response of La3+ sensor were investigated. The electrode exhibits a
Nernstian slope of 20.9±1.8 mV per decade of La3+ over a wide concentration range 3.3×10-7-1.0×10-2 M in
the pH range 3.7-7.3. The response time is about 7s and detection limit is 2.5 ×10-7 M and it can be used for
at least 1month without any considerable divergence in potential. It was used as an indicator electrode in
potentiometric titration of lanthanum(III) ion with EDTA.

کلیدواژه‌ها

Lanthanum (III)؛ Ion Selective Electrode؛ PVC