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dc.contributor.authorVenâncio, Lígia V.L.
dc.contributor.authorFarinha, Andreia S.F.
dc.contributor.authorGomes, M. Teresa S.R.
dc.date.accessioned2018-12-31T13:19:34Z
dc.date.available2018-12-31T13:19:34Z
dc.date.issued2018-06-19
dc.identifier.citationVenâncio LVL, Farinha ASF, Gomes MTSR (2018) Analysing sulphate and chloride in mineral drinking water by flow injection analysis with a single acoustic wave sensor. Talanta 189: 65–70. Available: http://dx.doi.org/10.1016/j.talanta.2018.06.055.
dc.identifier.issn0039-9140
dc.identifier.doi10.1016/j.talanta.2018.06.055
dc.identifier.urihttp://hdl.handle.net/10754/630463
dc.description.abstractSulphate is a very hydrophilic anion, and, therefore, difficult to be selectively determined in aqueous solution with a coated sensor. Zinc(II) 2,3,9,10,16,17,23,24-Octatosylaminophthalocyanine was used for the first time as a sensitive coating. Selectivity to sulphate regarding chloride was not enough to ignore its contribution in mineral waters, and, therefore, an analytical protocol was carefully designed to allow the determination of both anions with this sensor. Results displayed on the label of eight commercial bottles of mineral waters are within the confidence interval of the values obtained with the FIA-sensor system, both for chloride and sulphate. However, results for chloride obtained by titrimetry are, in half of the cases, statistically different from the ones obtained by the sensor, and in 7 out of 8 of them more precise. There is an evidence of a systematic error in the chloride titrimetric analysis, consistent with a small overtaking of the equivalence point. Precision of the results obtained by the titrimetric analysis of sulphate were in 6 out of 8 of the analysis less precise than with the sensor, probably due to losses of the barium sulphate precipitate, which is consistent with the occurrence of lower values.
dc.description.sponsorshipThanks are due for the financial support to CESAM (UID/AMB/50017 - POCI-01–0145-FEDER-007638), to FCT/MCTES through national funds (PIDDAC), and the co-funding by the FEDER, within the PT2020 Partnership Agreement and Compete 2020
dc.publisherElsevier BV
dc.relation.urlhttps://www.sciencedirect.com/science/article/pii/S0039914018306581
dc.subject10
dc.subject16
dc.subject17
dc.subject23
dc.subject24-octatosylaminophthalocyanine
dc.subject3
dc.subject9
dc.subjectAcoustic wave sensor
dc.subjectChloride
dc.subjectPiezoelectric quartz crystal
dc.subjectSulphate
dc.subjectZinc(II) 2
dc.titleAnalysing sulphate and chloride in mineral drinking water by flow injection analysis with a single acoustic wave sensor
dc.typeArticle
dc.contributor.departmentBiological and Environmental Sciences and Engineering (BESE) Division
dc.contributor.departmentWater Desalination and Reuse Research Center (WDRC)
dc.identifier.journalTalanta
dc.contributor.institutionCESAM & Department of Chemistry, University of Aveiro, Aveiro, 3810-193, , Portugal
dc.contributor.institutionQOPNA & Department of Chemistry, University of Aveiro, Aveiro, 3810-193, , Portugal
kaust.personFarinha, Andreia S.F.
dc.date.published-online2018-06-19
dc.date.published-print2018-11


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