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http://hdl.handle.net/10773/25034
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DC Field | Value | Language |
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dc.contributor.author | Valente, Nuno I. P. | pt_PT |
dc.contributor.author | Muteto, Paulino V. | pt_PT |
dc.contributor.author | Farinha, Andreia S. F. | pt_PT |
dc.contributor.author | Tomé, Augusto C. | pt_PT |
dc.contributor.author | Oliveira, João A. B. P. | pt_PT |
dc.contributor.author | Gomes, M. Teresa S. R. | pt_PT |
dc.date.accessioned | 2019-01-10T12:30:50Z | - |
dc.date.available | 2019-01-10T12:30:50Z | - |
dc.date.issued | 2011 | - |
dc.identifier.issn | 0925-4005 | pt_PT |
dc.identifier.uri | http://hdl.handle.net/10773/25034 | - |
dc.description.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. | pt_PT |
dc.description.sponsorship | This work was supported by the FCT, FEDER and CESAM. | pt_PT |
dc.language.iso | eng | pt_PT |
dc.publisher | Elsevier | pt_PT |
dc.rights | restrictedAccess | pt_PT |
dc.rights.uri | https://creativecommons.org/licenses/by/4.0/ | pt_PT |
dc.subject | Acoustic wave sensor | pt_PT |
dc.subject | Fluoride | pt_PT |
dc.subject | Calix[4]pyrrole | pt_PT |
dc.subject | Piezoelectric quartz crystal | pt_PT |
dc.title | An acoustic wave sensor for the hydrophilic fluoride | pt_PT |
dc.type | article | pt_PT |
dc.description.version | published | pt_PT |
dc.peerreviewed | yes | pt_PT |
degois.publication.firstPage | 594 | pt_PT |
degois.publication.issue | 2 | pt_PT |
degois.publication.lastPage | 599 | pt_PT |
degois.publication.title | Sensors and Actuators B: Chemical | pt_PT |
degois.publication.volume | 157 | pt_PT |
dc.identifier.doi | 10.1016/j.snb.2011.05.028 | pt_PT |
Appears in Collections: | CESAM - Artigos DQ - Artigos QOPNA - Artigos |
Files in This Item:
File | Description | Size | Format | |
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Valente et al. - 2011 - An acoustic wave sensor for the hydrophilic fluori.pdf | 497.75 kB | Adobe PDF |
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