Please use this identifier to cite or link to this item:
http://hdl.handle.net/10773/25034
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 Fluoride Calix[4]pyrrole 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 |
URI: | http://hdl.handle.net/10773/25034 |
DOI: | 10.1016/j.snb.2011.05.028 |
ISSN: | 0925-4005 |
Appears in Collections: | CESAM - Artigos DQ - Artigos QOPNA - Artigos |
Files in This Item:
File | Description | Size | Format | |
---|---|---|---|---|
Valente et al. - 2011 - An acoustic wave sensor for the hydrophilic fluori.pdf | 497.75 kB | Adobe PDF |
Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.