Determination of mercury in phosphate fertilizers by cold vapor atomic absorption spectrometry

Detalhes bibliográficos
Autor(a) principal: Jesus, Robson M. de
Data de Publicação: 2013
Outros Autores: Silva, Laiana O. B., Castro, Jacira T., Azevedo Neto, André Dias de, Jesus, Raildo M. de, Ferreira, Sergio Luis Costa
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Repositório Institucional da UFBA
Texto Completo: http://repositorio.ufba.br/ri/handle/ri/16816
Resumo: Texto completo: acesso restrito. p. 293–297
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spelling Jesus, Robson M. deSilva, Laiana O. B.Castro, Jacira T.Azevedo Neto, André Dias deJesus, Raildo M. deFerreira, Sergio Luis CostaJesus, Robson M. deSilva, Laiana O. B.Castro, Jacira T.Azevedo Neto, André Dias deJesus, Raildo M. deFerreira, Sergio Luis Costa2014-12-17T12:22:10Z20130039-9140http://repositorio.ufba.br/ri/handle/ri/16816v. 106, n. 15Texto completo: acesso restrito. p. 293–297n this paper, a method for the determination of mercury in phosphate fertilizers using slurry sampling and cold vapor atomic absorption spectrometry (CV QT AAS) is proposed. Because mercury (II) ions form strong complexes with phosphor compounds, the formation of metallic mercury vapor requires the presence of lanthanum chloride as a release agent. Thiourea increases the amount of mercury that is extracted from the solid sample to the liquid phase of the slurry. The method is established using two steps. First, the slurry is prepared using the sample, lanthanum chloride, hydrochloric acid solution and thiourea solution and is sonicated for 20 min. Afterward, mercury vapor is generated using an aliquot of the slurry in the presence of the hydrochloric acid solution and isoamylic alcohol with sodium tetrahydroborate solution as the reducing agent. The experimental conditions for slurry preparation were optimized using two-level full factorial design involving the factors: thiourea and lanthanum chloride concentrations and the duration of sonication. The method allows the determination of mercury by external calibration using aqueous standards with limits of detection and quantification of 2.4 and 8.2 μg kg−1, respectively, and precision, expressed as relative standard deviation, of 6.36 and 5.81% for two phosphate fertilizer samples with mercury concentrations of 0.24 and 0.57 mg kg−1, respectively. The accuracy was confirmed by the analysis of a certified reference material of phosphate fertilizer that was provided by the National Institute of Standards & Technology (NIST). The method was applied to determine mercury in six commercial samples of phosphate fertilizers. The mercury content varied from 33.97 to 209.28 μg kg−1. These samples were also analyzed employing inductively coupled plasma mass spectrometry (ICP-MS). The ICP-MS results were consistent with the results from our proposed method.Submitted by Edileide Reis (leyde-landy@hotmail.com) on 2014-12-17T12:22:10Z No. of bitstreams: 1 Robson M. de Jesus.pdf: 145757 bytes, checksum: 8b77785bbcddf44793203ed74e962025 (MD5)Made available in DSpace on 2014-12-17T12:22:10Z (GMT). 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dc.title.pt_BR.fl_str_mv Determination of mercury in phosphate fertilizers by cold vapor atomic absorption spectrometry
dc.title.alternative.pt_BR.fl_str_mv Talanta
title Determination of mercury in phosphate fertilizers by cold vapor atomic absorption spectrometry
spellingShingle Determination of mercury in phosphate fertilizers by cold vapor atomic absorption spectrometry
Jesus, Robson M. de
Mercury
Phosphate fertilizers
CV AAS
Slurry sampling
Release agent
title_short Determination of mercury in phosphate fertilizers by cold vapor atomic absorption spectrometry
title_full Determination of mercury in phosphate fertilizers by cold vapor atomic absorption spectrometry
title_fullStr Determination of mercury in phosphate fertilizers by cold vapor atomic absorption spectrometry
title_full_unstemmed Determination of mercury in phosphate fertilizers by cold vapor atomic absorption spectrometry
title_sort Determination of mercury in phosphate fertilizers by cold vapor atomic absorption spectrometry
author Jesus, Robson M. de
author_facet Jesus, Robson M. de
Silva, Laiana O. B.
Castro, Jacira T.
Azevedo Neto, André Dias de
Jesus, Raildo M. de
Ferreira, Sergio Luis Costa
author_role author
author2 Silva, Laiana O. B.
Castro, Jacira T.
Azevedo Neto, André Dias de
Jesus, Raildo M. de
Ferreira, Sergio Luis Costa
author2_role author
author
author
author
author
dc.contributor.author.fl_str_mv Jesus, Robson M. de
Silva, Laiana O. B.
Castro, Jacira T.
Azevedo Neto, André Dias de
Jesus, Raildo M. de
Ferreira, Sergio Luis Costa
Jesus, Robson M. de
Silva, Laiana O. B.
Castro, Jacira T.
Azevedo Neto, André Dias de
Jesus, Raildo M. de
Ferreira, Sergio Luis Costa
dc.subject.por.fl_str_mv Mercury
Phosphate fertilizers
CV AAS
Slurry sampling
Release agent
topic Mercury
Phosphate fertilizers
CV AAS
Slurry sampling
Release agent
description Texto completo: acesso restrito. p. 293–297
publishDate 2013
dc.date.issued.fl_str_mv 2013
dc.date.accessioned.fl_str_mv 2014-12-17T12:22:10Z
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://repositorio.ufba.br/ri/handle/ri/16816
dc.identifier.issn.none.fl_str_mv 0039-9140
dc.identifier.number.pt_BR.fl_str_mv v. 106, n. 15
identifier_str_mv 0039-9140
v. 106, n. 15
url http://repositorio.ufba.br/ri/handle/ri/16816
dc.language.iso.fl_str_mv eng
language eng
dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.source.pt_BR.fl_str_mv http://dx.doi.org/ 10.1016/j.talanta.2012.11.001
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