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Lead-Selective Membrane Electrodes Based on Dithiophenediazacrown Ether Derivatives
journal contribution
posted on 2023-05-16, 10:58 authored by Yang, X, Kumar, N, Chi, H, Hibbert, DB, Alexander, PWThree 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.
History
Publication title
ElectroanalysisVolume
9Issue
7Pagination
549-553ISSN
1040-0397Department/School
University CollegePublisher
VCH Verlagsgesellschaft mbHPlace of publication
WeinheimRepository Status
- Restricted