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DKUM
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Title:
Sol-gel-based optical sensor for the detection of aqueous amines
Authors:
ID
Korent Urek, Špela
(Author)
ID
Lobnik, Aleksandra
(Author)
ID
Mohr, Gerhard J.
(Author)
Files:
http://dx.doi.org/10.1007/s00216-007-1146-x
Language:
English
Work type:
Unknown
Typology:
1.01 - Original Scientific Article
Organization:
FS - Faculty of Mechanical Engineering
Abstract:
We present an optical sensor for the detection of aqueous amines obtained by incorporating chromoionophore XV (ETHT 4001) into sol-gel thin films. Acid- and base-catalyzed sol-gel processes were studied to prepare stable ormosil layers using various amounts of organically modified sol-gel precursor such asmethyltriethoxysilane (MTriEOS). The sensor layers were coated with a protective layer of microporous white polytetrafluoroethylene (PTFE) in order to prevent interference from ions and ambient light. The measurements were carried out in a flow-through cell in the reflection mode. Acid-catalyzed ormosil layers (pH 1) based on the copolymerization of tetraethoxysilane (TEOS) and MTriEOS did not show any change in signal upon exposure to aqueous amine solutions, while base-catalyzed sensor layers (pH 3 and 13) showed significant changes in signal. The response time (t100) for the base-catalyzedsensor layer L3 (pH 13) upon exposure to different solutions containing 0-608 mmol L-1 aqueous propylamine was 20-30 s, the regeneration time was 70 s and the detection limit was 0.1 mmol L-1. The sensor response was reproducible and reversible. The porous ormosil layers permit dry sensor storage conditions.
Keywords:
analytical chemistry
,
optical sensors
,
sol-gel technology
,
determination of amines
,
fluorimetry
Year of publishing:
2007
PID:
20.500.12556/DKUM-27470
UDC:
543.4
ISSN on article:
1618-2642
COBISS.SI-ID:
11135254
NUK URN:
URN:SI:UM:DK:EWTYOBLA
Publication date in DKUM:
01.06.2012
Views:
3256
Downloads:
94
Metadata:
Categories:
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Record is a part of a journal
Title:
Analytical and bioanalytical chemistry
Shortened title:
Anal. bioanal. chem.
Publisher:
Springer
ISSN:
1618-2642
COBISS.SI-ID:
6966294
Secondary language
Language:
English
Keywords:
analizna kemija
,
optični senzorji
,
sol-gel tehnologija
,
določevanje aminov
,
fluorometrija
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