Analysing sulphate and chloride in mineral drinking water by flow injection analysis with a single acoustic wave sensor
Autor(a) principal: | |
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Data de Publicação: | 2018 |
Outros Autores: | , |
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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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 |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
application/pdf |
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) instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação instacron:RCAAP |
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Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação |
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RCAAP |
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RCAAP |
reponame_str |
Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
collection |
Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
repository.name.fl_str_mv |
Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação |
repository.mail.fl_str_mv |
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1799137729841201152 |