Determinations of phosphorus in fertilizers by spark discharge-assisted laser-induced breakdown spectroscopy

Página do item simplificado
dc.contributor.authorVieira, Alan Lima [UNESP]
dc.contributor.authorSilva, Tiago Varão [UNESP]
dc.contributor.authorde Sousa, Felipe Schiavon Inocêncio
dc.contributor.authorSenesi, Giorgio Saverio
dc.contributor.authorJúnior, Dário Santos
dc.contributor.authorFerreira, Edilene Cristina [UNESP]
dc.contributor.authorNeto, José Anchieta Gomes [UNESP]
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.contributor.institutionUniversidade de São Paulo (USP)
dc.contributor.institutionCNR-Istituto di Nanotecnologia (NANOTEC) – PLasMI Lab
dc.date.accessioned2018-12-11T17:36:12Z
dc.date.available2018-12-11T17:36:12Z
dc.date.issued2018-06-01
dc.description.abstractA spark discharge system was coupled to laser-induced breakdown spectroscopy (SD-LIBS) to improve sensitivity in the determination of P in fertilizers. A LIBS system consisting of a Q-switched Nd:YAG laser operating at 1064 nm and emitting pulses at 50 mJ with a fluence of 70 J cm−2 at the focal point was used. Results of preliminary experiments suggested that the most appropriate wavelength to measure P was the P (I) line at 214.9 nm, which did not show interferences by Fe, Cu and Zn. The electrical discharge was provided by a homemade high-voltage electronic circuit consisting of two cylindrical tungsten electrodes at the optimized output voltage of 4.5 kV, with tips arranged at the optimal distances of 4 mm between them and 2 mm above the sample surface. To minimize the expected matrix effects calibration standards of P2O5 in the range of 4.8 and 33.3% were prepared by mixing various amounts of a phosphate rock reference material (SRM-120c) with a mixture of CaCO3, CaSO4, (NH2)2CO and KCl at a 1:1:1:1 mass ratio. The calibration curves obtained at a 4.5 kV SD-LIBS output voltage showed correlation coefficients ≥0.993, RSD ≤8% and LOQ 5.3% (m/m) P2O5. Data obtained by analyzing commercial samples by the proposed system were in good agreement, at 95% confidence level, with those obtained by using high-resolution continuum-source flame atomic absorption spectroscopy.en
dc.description.affiliationSão Paulo State University - UNESP Analytical Chemistry Department, P.O. Box 355
dc.description.affiliationUniversity of São Paulo – USP Department of Electrical and Computer Engineering
dc.description.affiliationCNR-Istituto di Nanotecnologia (NANOTEC) – PLasMI Lab, Via Amendola 122/D
dc.description.affiliationFederal University of São Paulo - UNIFESP Exact and Earth Sciences Department
dc.description.affiliationUnespSão Paulo State University - UNESP Analytical Chemistry Department, P.O. Box 355
dc.description.sponsorshipConselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
dc.description.sponsorshipFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
dc.description.sponsorshipIdCNPq: 141977/2016-7
dc.description.sponsorshipIdFAPESP: 2004/14212-0
dc.description.sponsorshipIdCNPq: 2015/24757-9
dc.description.sponsorshipIdCNPq: 303255/2013-7
dc.description.sponsorshipIdCNPq: 311085/2014-8
dc.format.extent322-326
dc.identifierhttp://dx.doi.org/10.1016/j.microc.2018.03.011
dc.identifier.citationMicrochemical Journal, v. 139, p. 322-326.
dc.identifier.doi10.1016/j.microc.2018.03.011
dc.identifier.file2-s2.0-85043451770.pdf
dc.identifier.issn0026-265X
dc.identifier.scopus2-s2.0-85043451770
dc.identifier.urihttp://hdl.handle.net/11449/179652
dc.language.isoeng
dc.relation.ispartofMicrochemical Journal
dc.rights.accessRightsAcesso aberto
dc.sourceScopus
dc.subjectFertilizer analysis
dc.subjectLIBS
dc.subjectPhosphorus determination
dc.subjectSpark discharge
dc.titleDeterminations of phosphorus in fertilizers by spark discharge-assisted laser-induced breakdown spectroscopyen
dc.typeArtigo

Arquivos

Pacote Original
Agora exibindo 1 - 1 de 1
Imagem de Miniatura
Nome:
2-s2.0-85043451770.pdf
Tamanho:
704.75 KB
Formato:
Adobe Portable Document Format
Descrição:
Baixar

Coleções

Artigos - Química Analítica - IQ