Premium
Novel Potentiometric PVC‐Membrane and Coated Graphite Sensors for Lanthanum(III)
Author(s) -
Ganjali Mohammad Reza,
KianiAnbouhi Roya,
Shamsipur Mojtaba,
Poursaberi Tahereh,
SalavatiNiasari Masoud,
Talebpour Zahra,
Emami Mahdi
Publication year - 2004
Publication title -
electroanalysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.574
H-Index - 128
eISSN - 1521-4109
pISSN - 1040-0397
DOI - 10.1002/elan.200302899
Subject(s) - potentiometric titration , membrane , lanthanum , graphite , inorganic chemistry , electrode , chemistry , fluoride , potentiometric sensor , alkali metal , ion selective electrode , metal ions in aqueous solution , titration , ion , analytical chemistry (journal) , nuclear chemistry , chromatography , selectivity , organic chemistry , biochemistry , catalysis
Preliminary theoretical studies revealed the selective complexation of bis (2‐mercaptoanil) diacetyl (BMDA) with La 3+ over several alkali, alkaline earth and heavy metal ions. Thus, novel PVC‐based membrane (PBM) and coated graphite membrane (CGM) sensors for La(III) based on BMDA were prepared. The electrodes display Nernstian behavior over wide concentration ranges (i.e., 1.0×10 −5 –1.0×10 −1 M for PBM and 1.0×10 −6 –1.0×10 −1 M for CGM). The potential response of sensors was pH independent in the range of 4.0–8.0. The sensors possess satisfactory reproducibility, fast response time (<15 s), and specially excellent discriminating ability for La 3+ ions with respect to most of the cations. The membrane sensor was used as an indicator electrode in potentiometric titration of lanthanum ions with EDTA. The coated graphite membrane electrode was applied in determination of fluoride ions in mouth wash preparations.