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Title: An acoustic wave sensor for the hydrophilic fluoride
Author: Valente, Nuno I. P.
Muteto, Paulino V.
Farinha, Andreia S. F.
Tomé, Augusto C.
Oliveira, João A. B. P.
Gomes, M. Teresa S. R.
Keywords: Acoustic wave sensor
Piezoelectric quartz crystal
Issue Date: 2011
Publisher: Elsevier
Abstract: A new acoustic wave sensor to detect and quantify fluoride, one of the most hydrophilic anions, is proposed. Meso-octamethylcalix[4]pyrrole (OMCP) and seven of its derivatives were evaluated as piezoelectric quartz crystal coatings. Some of these sensors experienced appreciable coating leaching under a water flow, while others did show a very small sensitivity to fluoride. As the OMCP-naphthoquinone sensor was very sensitive to fluoride and did not lose a significant amount (α = 0.05) of coating during eight weeks, it was selected among all the others. A piezoelectric crystal coated with an amount of OMCP-naphthoquinone that produced a frequency decrease of 22 kHz showed a linear calibration range that extended up to 80 mg L−1, within which sensitivity to fluoride was 0.45 Hz L mg−1, and was able to detect fluoride at the concentration of 3.66 mg L−1. This sensor was used to determine fluoride in commercial fluoride tablets, and the result found was not statistically different (α = 0.05) from the value provided by the manufacturer.
Peer review: yes
DOI: 10.1016/j.snb.2011.05.028
ISSN: 0925-4005
Appears in Collections:CESAM - Artigos
DQ - Artigos
QOPNA - Artigos

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