Laser-induced breakdown spectroscopy: Extending its application to soil pH measurements
Autor(a) principal: | |
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Data de Publicação: | 2015 |
Outros Autores: | , , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Institucional da UNESP |
Texto Completo: | http://dx.doi.org/10.1016/j.sab.2015.06.002 http://hdl.handle.net/11449/177391 |
Resumo: | Acid-base equilibria are involved in almost all the processes that occur in soil. The bioavailability of nutrients for plants, for instance, depends on the solubilization of mineral nutrients in the soil solution, which is a pH-dependent process. The determination of pH in soil solutions is usually carried out by potentiometry using a glass membrane electrode, after extracting some of the soil components with water or CaCl<inf>2</inf> solution. The present work describes a simple method for determining the pH of soil, using laser-induced breakdown spectroscopy (LIBS). Sixty samples presenting different textural composition and pH (previously determined by potentiometry) were employed. The samples were divided into a calibration set with fifty samples and a validation set with ten samples. LIBS spectra were recorded for each pelleted sample using laser pulse energy of 115 mJ. The intensities of thirty-two emission lines for Al, Ca, H, and O were used to fit a partial least squares (PLS) model. The model was validated by prediction of the pH of the validation set samples, which showed good agreement with the reference values. The prediction mean absolute error was 0.3 pH units and the root mean square error of the prediction was 0.4. These results highlight the potential of LIBS for use in other applications beyond elemental composition determinations. For soil analysis, the proposed method offers the possibility of determining pH, in addition to nutrients and contaminants, using a single LIBS measurement. |
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Repositório Institucional da UNESP |
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Laser-induced breakdown spectroscopy: Extending its application to soil pH measurementsLIBSPLSSoil pH determinationAcid-base equilibria are involved in almost all the processes that occur in soil. The bioavailability of nutrients for plants, for instance, depends on the solubilization of mineral nutrients in the soil solution, which is a pH-dependent process. The determination of pH in soil solutions is usually carried out by potentiometry using a glass membrane electrode, after extracting some of the soil components with water or CaCl<inf>2</inf> solution. The present work describes a simple method for determining the pH of soil, using laser-induced breakdown spectroscopy (LIBS). Sixty samples presenting different textural composition and pH (previously determined by potentiometry) were employed. The samples were divided into a calibration set with fifty samples and a validation set with ten samples. LIBS spectra were recorded for each pelleted sample using laser pulse energy of 115 mJ. The intensities of thirty-two emission lines for Al, Ca, H, and O were used to fit a partial least squares (PLS) model. The model was validated by prediction of the pH of the validation set samples, which showed good agreement with the reference values. The prediction mean absolute error was 0.3 pH units and the root mean square error of the prediction was 0.4. These results highlight the potential of LIBS for use in other applications beyond elemental composition determinations. For soil analysis, the proposed method offers the possibility of determining pH, in addition to nutrients and contaminants, using a single LIBS measurement.São Paulo State University - UNESP, Analytical Chemistry Department, Rua Prof. Francisco Degni 55Embrapa Agricultural Instrumentation, Rua XV de Novembro 1452Laser Laboratory and Environment, Faculty of Sciences, University of Zaragoza, C/. Pedro Cerbuna 12São Paulo State University - UNESP, Analytical Chemistry Department, Rua Prof. Francisco Degni 55Universidade Estadual Paulista (Unesp)Empresa Brasileira de Pesquisa Agropecuária (EMBRAPA)Laser Laboratory and Environment, Faculty of Sciences, University of ZaragozaFerreira, Edilene Cristina [UNESP]Gomes Neto, José A. [UNESP]Milori, Débora M.B.P.Ferreira, Ednaldo JoséAnzano, Jesús Manuel2018-12-11T17:25:12Z2018-12-11T17:25:12Z2015-06-23info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/article96-99application/pdfhttp://dx.doi.org/10.1016/j.sab.2015.06.002Spectrochimica Acta - Part B Atomic Spectroscopy, v. 110, p. 96-99.0584-8547http://hdl.handle.net/11449/17739110.1016/j.sab.2015.06.0022-s2.0-849349668592-s2.0-84934966859.pdfScopusreponame:Repositório Institucional da UNESPinstname:Universidade Estadual Paulista (UNESP)instacron:UNESPengSpectrochimica Acta - Part B Atomic Spectroscopy0,960info:eu-repo/semantics/openAccess2024-01-28T06:44:09Zoai:repositorio.unesp.br:11449/177391Repositório InstitucionalPUBhttp://repositorio.unesp.br/oai/requestopendoar:29462024-01-28T06:44:09Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)false |
dc.title.none.fl_str_mv |
Laser-induced breakdown spectroscopy: Extending its application to soil pH measurements |
title |
Laser-induced breakdown spectroscopy: Extending its application to soil pH measurements |
spellingShingle |
Laser-induced breakdown spectroscopy: Extending its application to soil pH measurements Ferreira, Edilene Cristina [UNESP] LIBS PLS Soil pH determination |
title_short |
Laser-induced breakdown spectroscopy: Extending its application to soil pH measurements |
title_full |
Laser-induced breakdown spectroscopy: Extending its application to soil pH measurements |
title_fullStr |
Laser-induced breakdown spectroscopy: Extending its application to soil pH measurements |
title_full_unstemmed |
Laser-induced breakdown spectroscopy: Extending its application to soil pH measurements |
title_sort |
Laser-induced breakdown spectroscopy: Extending its application to soil pH measurements |
author |
Ferreira, Edilene Cristina [UNESP] |
author_facet |
Ferreira, Edilene Cristina [UNESP] Gomes Neto, José A. [UNESP] Milori, Débora M.B.P. Ferreira, Ednaldo José Anzano, Jesús Manuel |
author_role |
author |
author2 |
Gomes Neto, José A. [UNESP] Milori, Débora M.B.P. Ferreira, Ednaldo José Anzano, Jesús Manuel |
author2_role |
author author author author |
dc.contributor.none.fl_str_mv |
Universidade Estadual Paulista (Unesp) Empresa Brasileira de Pesquisa Agropecuária (EMBRAPA) Laser Laboratory and Environment, Faculty of Sciences, University of Zaragoza |
dc.contributor.author.fl_str_mv |
Ferreira, Edilene Cristina [UNESP] Gomes Neto, José A. [UNESP] Milori, Débora M.B.P. Ferreira, Ednaldo José Anzano, Jesús Manuel |
dc.subject.por.fl_str_mv |
LIBS PLS Soil pH determination |
topic |
LIBS PLS Soil pH determination |
description |
Acid-base equilibria are involved in almost all the processes that occur in soil. The bioavailability of nutrients for plants, for instance, depends on the solubilization of mineral nutrients in the soil solution, which is a pH-dependent process. The determination of pH in soil solutions is usually carried out by potentiometry using a glass membrane electrode, after extracting some of the soil components with water or CaCl<inf>2</inf> solution. The present work describes a simple method for determining the pH of soil, using laser-induced breakdown spectroscopy (LIBS). Sixty samples presenting different textural composition and pH (previously determined by potentiometry) were employed. The samples were divided into a calibration set with fifty samples and a validation set with ten samples. LIBS spectra were recorded for each pelleted sample using laser pulse energy of 115 mJ. The intensities of thirty-two emission lines for Al, Ca, H, and O were used to fit a partial least squares (PLS) model. The model was validated by prediction of the pH of the validation set samples, which showed good agreement with the reference values. The prediction mean absolute error was 0.3 pH units and the root mean square error of the prediction was 0.4. These results highlight the potential of LIBS for use in other applications beyond elemental composition determinations. For soil analysis, the proposed method offers the possibility of determining pH, in addition to nutrients and contaminants, using a single LIBS measurement. |
publishDate |
2015 |
dc.date.none.fl_str_mv |
2015-06-23 2018-12-11T17:25:12Z 2018-12-11T17:25:12Z |
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://dx.doi.org/10.1016/j.sab.2015.06.002 Spectrochimica Acta - Part B Atomic Spectroscopy, v. 110, p. 96-99. 0584-8547 http://hdl.handle.net/11449/177391 10.1016/j.sab.2015.06.002 2-s2.0-84934966859 2-s2.0-84934966859.pdf |
url |
http://dx.doi.org/10.1016/j.sab.2015.06.002 http://hdl.handle.net/11449/177391 |
identifier_str_mv |
Spectrochimica Acta - Part B Atomic Spectroscopy, v. 110, p. 96-99. 0584-8547 10.1016/j.sab.2015.06.002 2-s2.0-84934966859 2-s2.0-84934966859.pdf |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
Spectrochimica Acta - Part B Atomic Spectroscopy 0,960 |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
96-99 application/pdf |
dc.source.none.fl_str_mv |
Scopus reponame:Repositório Institucional da UNESP instname:Universidade Estadual Paulista (UNESP) instacron:UNESP |
instname_str |
Universidade Estadual Paulista (UNESP) |
instacron_str |
UNESP |
institution |
UNESP |
reponame_str |
Repositório Institucional da UNESP |
collection |
Repositório Institucional da UNESP |
repository.name.fl_str_mv |
Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP) |
repository.mail.fl_str_mv |
|
_version_ |
1799965745893867520 |