Determinations of phosphorus in fertilizers by spark discharge-assisted laser-induced breakdown spectroscopy
dc.contributor.author | Vieira, Alan Lima [UNESP] | |
dc.contributor.author | Silva, Tiago Varão [UNESP] | |
dc.contributor.author | de Sousa, Felipe Schiavon Inocêncio | |
dc.contributor.author | Senesi, Giorgio Saverio | |
dc.contributor.author | Júnior, Dário Santos | |
dc.contributor.author | Ferreira, Edilene Cristina [UNESP] | |
dc.contributor.author | Neto, José Anchieta Gomes [UNESP] | |
dc.contributor.institution | Universidade Estadual Paulista (Unesp) | |
dc.contributor.institution | Universidade de São Paulo (USP) | |
dc.contributor.institution | CNR-Istituto di Nanotecnologia (NANOTEC) – PLasMI Lab | |
dc.date.accessioned | 2018-12-11T17:36:12Z | |
dc.date.available | 2018-12-11T17:36:12Z | |
dc.date.issued | 2018-06-01 | |
dc.description.abstract | A 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.affiliation | São Paulo State University - UNESP Analytical Chemistry Department, P.O. Box 355 | |
dc.description.affiliation | University of São Paulo – USP Department of Electrical and Computer Engineering | |
dc.description.affiliation | CNR-Istituto di Nanotecnologia (NANOTEC) – PLasMI Lab, Via Amendola 122/D | |
dc.description.affiliation | Federal University of São Paulo - UNIFESP Exact and Earth Sciences Department | |
dc.description.affiliationUnesp | São Paulo State University - UNESP Analytical Chemistry Department, P.O. Box 355 | |
dc.description.sponsorship | Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) | |
dc.description.sponsorship | Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP) | |
dc.description.sponsorshipId | CNPq: 141977/2016-7 | |
dc.description.sponsorshipId | FAPESP: 2004/14212-0 | |
dc.description.sponsorshipId | CNPq: 2015/24757-9 | |
dc.description.sponsorshipId | CNPq: 303255/2013-7 | |
dc.description.sponsorshipId | CNPq: 311085/2014-8 | |
dc.format.extent | 322-326 | |
dc.identifier | http://dx.doi.org/10.1016/j.microc.2018.03.011 | |
dc.identifier.citation | Microchemical Journal, v. 139, p. 322-326. | |
dc.identifier.doi | 10.1016/j.microc.2018.03.011 | |
dc.identifier.file | 2-s2.0-85043451770.pdf | |
dc.identifier.issn | 0026-265X | |
dc.identifier.scopus | 2-s2.0-85043451770 | |
dc.identifier.uri | http://hdl.handle.net/11449/179652 | |
dc.language.iso | eng | |
dc.relation.ispartof | Microchemical Journal | |
dc.rights.accessRights | Acesso aberto | |
dc.source | Scopus | |
dc.subject | Fertilizer analysis | |
dc.subject | LIBS | |
dc.subject | Phosphorus determination | |
dc.subject | Spark discharge | |
dc.title | Determinations of phosphorus in fertilizers by spark discharge-assisted laser-induced breakdown spectroscopy | en |
dc.type | Artigo |
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