A1 Journal article – refereed
Hydrated electron-induced chemiluminescence of thallium(I) ion

List of Authors: Kulmala A, Kulmala S, Ala-Kleme T, Hakanen A, Korpela T
Publication year: 1999
Journal: Analytica Chimica Acta
Journal name in source: ANALYTICA CHIMICA ACTA
Journal acronym: ANAL CHIM ACTA
Volume number: 382
Issue number: 3
Number of pages: 11
ISSN: 0003-2670

Dissolution of X-ray irradiated sodium chloride or additively coloured potassium chloride induces generation of hydrated electrons which produce thallium(I)-specific chemiluminescence in the presence of thallium(I) ions. Such a luminescence is also called extrinsic lyoluminescence (ELL) of X-ray irradiation coloured sodium chloride, or additively coloured potassium chloride. The present ELL is considered chemiluminescence induced by dissolution-produced strong reducing and oxidising agents, i.e. hydrated electrons, surface-bound and only partially hydrated hole centres, and hydroxyl or sulphate radicals (in the case of additively coloured potassium chloride dissolved in solution containing peroxodisulphate ions). Dichlorothallate(I) (Tl(I)Cl-2(-)) was the main emitter in the ELL processes at about 430 nn. The reduction-initiated excitation pathway of TlCl2- involves a colloidal thallium atom surrounded by chloride anions (Tl(O):2Cl(-)) while in the less important oxidation-initiated excitation pathway the precursor of excited Tl(I)Cl-2(-) is transiently existing T1(II)CI; produced by dissolution-uncovered hole centres (or sulphate radicals). Both of the lyoluminescence procedures allow Tl(I) to be detected below nanomolar concentrations, yielding linear log-log calibration plots spanning several orders of magnitude of concentration. (C) 1999 Elsevier Science B.V. All rights reserved.

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