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Titolo:
Flow injection analysis of water vapour based on a fluorosensor
Autore:
Choi, MMF; Tse, OL;
Indirizzi:
Hong Kong Baptist Univ, Dept Chem, Kowloon Tong, Hong Kong, Peoples R China Hong Kong Baptist Univ Kowloon Tong Hong Kong Peoples R China es R China
Titolo Testata:
ANALYTICA CHIMICA ACTA
fascicolo: 2, volume: 423, anno: 2000,
pagine: 229 - 238
SICI:
0003-2670(20001101)423:2<229:FIAOWV>2.0.ZU;2-E
Fonte:
ISI
Lingua:
ENG
Soggetto:
HUMIDITY SENSING CHARACTERISTICS; COMPOSITE THIN-FILMS; RELATIVE-HUMIDITY; ORGANO-GELS; SENSOR; MOISTURE; SPECTROSCOPY; STABILITY; NETWORKS; DIOXIDE;
Keywords:
fluorescence; organogel; water vapour; flow injection;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
43
Recensione:
Indirizzi per estratti:
Indirizzo: Choi, MMF Hong Kong Baptist Univ, Dept Chem, Kowloon Tong, Hong Kong, Peoples R China Hong Kong Baptist Univ Kowloon Tong Hong Kong Peoples R China
Citazione:
M.M.F. Choi e O.L. Tse, "Flow injection analysis of water vapour based on a fluorosensor", ANALYT CHIM, 423(2), 2000, pp. 229-238

Abstract

A new fluorimetric sensor incorporated with flow injection (FI) technique has been developed for water vapour quantification. The sensor was fabricated by immobilising rhodamine 6G in an organogel deposited on an overhead transparency film. The organogel was prepared from a solution of gelatine, rhodamine 6G and sodium bis(2-ethylhexyl)sulphosuccinate (AOT) in water-isooctane. Isooctane was employed as the organic solvent and AOT as the surfactant, thus forming water-in-oil microemulsions with a high capacity for watersolubilisation. The organogel-based optode membrane showed a strong fluorescence at 564 nm when it was excited at 540 nm. The fluorescence intensity of the optode membrane at 564 nm decreased upon exposure to water vapour. The sensing system exhibited a relatively wide linear dynamic range from 0.252 to 2.52 kPa water vapour pressure and also demonstrated a good linearity(correlation coefficient was 0.9912) at 20.0 degreesC and 1 atm pressure. The sensor had good repeatability, photostability and long-term stability. Oxygen, carbon dioxide gases, acetone, toluene, ethanol, chloroform, aceticacid vapours and NO, did not cause any interference. The addition of AOT to the organogel was shown to enhance the sensitivity for the detection of water vapour and also shortened the exposure and recovery times in which 1 cycle of Fl was completed within 1 min. (C) 2000 Elsevier Science B.V. All rights reserved.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 04/04/20 alle ore 21:29:36