Analysing sulphate and chloride in mineral drinking water by flow injection analysis with a single acoustic wave sensor

Detalhes bibliográficos
Autor(a) principal: Venâncio, Lígia V. L.
Data de Publicação: 2018
Outros Autores: Farinha, Andreia S. F., Gomes, M. Teresa S. R.
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
Texto Completo: http://hdl.handle.net/10773/36767
Resumo: Sulphate 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.
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spelling Analysing sulphate and chloride in mineral drinking water by flow injection analysis with a single acoustic wave sensorAcoustic wave sensorSulphateChlorideZinc(II) 23, 9, 10, 16, 17, 23, 24-octatosylaminophthalocyaninePiezoelectric quartz crystalSulphate 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.Elsevier2023-03-31T11:18:43Z2018-11-01T00:00:00Z2018-11-01info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleapplication/pdfhttp://hdl.handle.net/10773/36767eng0039-914010.1016/j.talanta.2018.06.055Venâncio, Lígia V. L.Farinha, Andreia S. F.Gomes, M. Teresa S. R.info:eu-repo/semantics/openAccessreponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãoinstacron:RCAAP2024-02-22T12:10:52Zoai:ria.ua.pt:10773/36767Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-20T03:07:28.248814Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãofalse
dc.title.none.fl_str_mv Analysing sulphate and chloride in mineral drinking water by flow injection analysis with a single acoustic wave sensor
title Analysing sulphate and chloride in mineral drinking water by flow injection analysis with a single acoustic wave sensor
spellingShingle Analysing sulphate and chloride in mineral drinking water by flow injection analysis with a single acoustic wave sensor
Venâncio, Lígia V. L.
Acoustic wave sensor
Sulphate
Chloride
Zinc(II) 2
3, 9, 10, 16, 17, 23, 24-octatosylaminophthalocyanine
Piezoelectric quartz crystal
title_short Analysing sulphate and chloride in mineral drinking water by flow injection analysis with a single acoustic wave sensor
title_full Analysing sulphate and chloride in mineral drinking water by flow injection analysis with a single acoustic wave sensor
title_fullStr Analysing sulphate and chloride in mineral drinking water by flow injection analysis with a single acoustic wave sensor
title_full_unstemmed Analysing sulphate and chloride in mineral drinking water by flow injection analysis with a single acoustic wave sensor
title_sort Analysing sulphate and chloride in mineral drinking water by flow injection analysis with a single acoustic wave sensor
author Venâncio, Lígia V. L.
author_facet Venâncio, Lígia V. L.
Farinha, Andreia S. F.
Gomes, M. Teresa S. R.
author_role author
author2 Farinha, Andreia S. F.
Gomes, M. Teresa S. R.
author2_role author
author
dc.contributor.author.fl_str_mv Venâncio, Lígia V. L.
Farinha, Andreia S. F.
Gomes, M. Teresa S. R.
dc.subject.por.fl_str_mv Acoustic wave sensor
Sulphate
Chloride
Zinc(II) 2
3, 9, 10, 16, 17, 23, 24-octatosylaminophthalocyanine
Piezoelectric quartz crystal
topic Acoustic wave sensor
Sulphate
Chloride
Zinc(II) 2
3, 9, 10, 16, 17, 23, 24-octatosylaminophthalocyanine
Piezoelectric quartz crystal
description Sulphate 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.
publishDate 2018
dc.date.none.fl_str_mv 2018-11-01T00:00:00Z
2018-11-01
2023-03-31T11:18:43Z
dc.type.status.fl_str_mv info:eu-repo/semantics/publishedVersion
dc.type.driver.fl_str_mv info:eu-repo/semantics/article
format article
status_str publishedVersion
dc.identifier.uri.fl_str_mv http://hdl.handle.net/10773/36767
url http://hdl.handle.net/10773/36767
dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv 0039-9140
10.1016/j.talanta.2018.06.055
dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
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dc.publisher.none.fl_str_mv Elsevier
publisher.none.fl_str_mv Elsevier
dc.source.none.fl_str_mv reponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
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