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Lead‐selective membrane electrodes based on dithiophenediazacrown ether derivatives
Author(s) -
Yang Xinhao,
Kumar Naresh,
Chi Hua,
Hibbert D. Brynn,
Alexander Peter W.
Publication year - 1997
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.1140090709
Subject(s) - potentiometric titration , electrode , chemistry , detection limit , electrochemistry , selectivity , ion selective electrode , inorganic chemistry , membrane , ether , ion , titration , mercury (programming language) , chromatography , organic chemistry , biochemistry , computer science , programming language , catalysis
Three double‐armed diazacrown ethers with two thiophene side groups, 7,16‐dithenyl‐1,4,10,13‐tetraoxa‐7,16‐diazacyclooctadecane (DTDC), 7,16‐dithenoyl‐1,4,10,13‐tetraoxa‐7,16‐diazacyclooctadecane (DTODC), and 7,16‐di‐(2‐thiopheneacetyl)‐1,4,10,13‐tetraoxa‐7,16‐diazacyclooctadecane (DTAODC), have been synthesized and used as novel neutral lead(II) ionophores in ion selective electrode applications. The relationship between the molecular structure of these ionophores and electrochemical properties (linear range, response time, selectivity) of the membrane electrode is discussed. The optimum conditions for the preparation of the electrodes are described. The optimized dithenoyldiazacrown had a detection limit of pPb = 5.7, and Nernstian range with slope 29.2 mV decade −1 from pPb = 5.0 to 2.7. Mercury and silver ions are the major interferences. These electrodes are applied to potentiometric titrations of lead(II) ions and show promise for the determination of lead ions in water samples.