Spectrophotometric determination of phosphite in fertilizers in a flow injection system with online sample preparation
Autor(a) principal: | |
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Data de Publicação: | 2000 |
Outros Autores: | , , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Institucional da UNESP |
Texto Completo: | http://dx.doi.org/10.1002/1098-2728(2000)12:6<286 http://hdl.handle.net/11449/224182 |
Resumo: | A flow injection system with online sample preparation is proposed for the determination of phosphite in liquid fertilizers by spectrophotometry. After loop-based injection, phosphite is oxidized by an acidic permanganate solution (1.0 10-2 mol L-1 KMnO4+1.0 mol L-1 H2SO4) in a heated reactor (50 °C). The phosphate generated is then determined by the molybdenum blue method. Influence of flow rates, temperature, and concentration and order of addition of reagents, sample volume, and reactor configuration for the blue complex formation on recorded signals were investigated. The flow system was applied to phosphite determination in commercial samples of liquid fertilizers. The proposed system handles about 80 samples per hour [0.05-0.40% (w/v) H3PO3; R = 0.9998], consuming about 80 μL sample, 1 mg KMnO4, 25 mg (NH4)6Mo7O24, and 10 mg ascorbic acid per determination. Results are precise [relative standard deviation ≤3.5% for 0.1% (w/v) H3PO3, n = 12] and in agreement with those obtained by gravimetry at 95% confidence level. |
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Repositório Institucional da UNESP |
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2946 |
spelling |
Spectrophotometric determination of phosphite in fertilizers in a flow injection system with online sample preparationA flow injection system with online sample preparation is proposed for the determination of phosphite in liquid fertilizers by spectrophotometry. After loop-based injection, phosphite is oxidized by an acidic permanganate solution (1.0 10-2 mol L-1 KMnO4+1.0 mol L-1 H2SO4) in a heated reactor (50 °C). The phosphate generated is then determined by the molybdenum blue method. Influence of flow rates, temperature, and concentration and order of addition of reagents, sample volume, and reactor configuration for the blue complex formation on recorded signals were investigated. The flow system was applied to phosphite determination in commercial samples of liquid fertilizers. The proposed system handles about 80 samples per hour [0.05-0.40% (w/v) H3PO3; R = 0.9998], consuming about 80 μL sample, 1 mg KMnO4, 25 mg (NH4)6Mo7O24, and 10 mg ascorbic acid per determination. Results are precise [relative standard deviation ≤3.5% for 0.1% (w/v) H3PO3, n = 12] and in agreement with those obtained by gravimetry at 95% confidence level.Depto. de Quim. Analítica Instituto de Química Paulista-UNESP, P.O. Box 355, 14801-970, Araraquara, SPDepto. de Quim. Analítica Instituto de Química Paulista-UNESP, P.O. Box 355, 14801-970, Araraquara, SPUniversidade Estadual Paulista (UNESP)Neto, José Anchieta Gomes [UNESP]Ito, Helenice Akemi [UNESP]Das Graças Fernandes, Kelly [UNESP]De Moraes, Mercedes [UNESP]Cardoso, Arnaldo Alves [UNESP]2022-04-28T19:55:03Z2022-04-28T19:55:03Z2000-12-01info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/article286-290http://dx.doi.org/10.1002/1098-2728(2000)12:6<286Laboratory Robotics and Automation, v. 12, n. 6, p. 286-290, 2000.0895-7533http://hdl.handle.net/11449/22418210.1002/1098-2728(2000)12:6<2862-s2.0-0034510707Scopusreponame:Repositório Institucional da UNESPinstname:Universidade Estadual Paulista (UNESP)instacron:UNESPengLaboratory Robotics and Automationinfo:eu-repo/semantics/openAccess2022-04-28T19:55:03Zoai:repositorio.unesp.br:11449/224182Repositório InstitucionalPUBhttp://repositorio.unesp.br/oai/requestopendoar:29462024-08-05T15:47:54.121044Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)false |
dc.title.none.fl_str_mv |
Spectrophotometric determination of phosphite in fertilizers in a flow injection system with online sample preparation |
title |
Spectrophotometric determination of phosphite in fertilizers in a flow injection system with online sample preparation |
spellingShingle |
Spectrophotometric determination of phosphite in fertilizers in a flow injection system with online sample preparation Neto, José Anchieta Gomes [UNESP] |
title_short |
Spectrophotometric determination of phosphite in fertilizers in a flow injection system with online sample preparation |
title_full |
Spectrophotometric determination of phosphite in fertilizers in a flow injection system with online sample preparation |
title_fullStr |
Spectrophotometric determination of phosphite in fertilizers in a flow injection system with online sample preparation |
title_full_unstemmed |
Spectrophotometric determination of phosphite in fertilizers in a flow injection system with online sample preparation |
title_sort |
Spectrophotometric determination of phosphite in fertilizers in a flow injection system with online sample preparation |
author |
Neto, José Anchieta Gomes [UNESP] |
author_facet |
Neto, José Anchieta Gomes [UNESP] Ito, Helenice Akemi [UNESP] Das Graças Fernandes, Kelly [UNESP] De Moraes, Mercedes [UNESP] Cardoso, Arnaldo Alves [UNESP] |
author_role |
author |
author2 |
Ito, Helenice Akemi [UNESP] Das Graças Fernandes, Kelly [UNESP] De Moraes, Mercedes [UNESP] Cardoso, Arnaldo Alves [UNESP] |
author2_role |
author author author author |
dc.contributor.none.fl_str_mv |
Universidade Estadual Paulista (UNESP) |
dc.contributor.author.fl_str_mv |
Neto, José Anchieta Gomes [UNESP] Ito, Helenice Akemi [UNESP] Das Graças Fernandes, Kelly [UNESP] De Moraes, Mercedes [UNESP] Cardoso, Arnaldo Alves [UNESP] |
description |
A flow injection system with online sample preparation is proposed for the determination of phosphite in liquid fertilizers by spectrophotometry. After loop-based injection, phosphite is oxidized by an acidic permanganate solution (1.0 10-2 mol L-1 KMnO4+1.0 mol L-1 H2SO4) in a heated reactor (50 °C). The phosphate generated is then determined by the molybdenum blue method. Influence of flow rates, temperature, and concentration and order of addition of reagents, sample volume, and reactor configuration for the blue complex formation on recorded signals were investigated. The flow system was applied to phosphite determination in commercial samples of liquid fertilizers. The proposed system handles about 80 samples per hour [0.05-0.40% (w/v) H3PO3; R = 0.9998], consuming about 80 μL sample, 1 mg KMnO4, 25 mg (NH4)6Mo7O24, and 10 mg ascorbic acid per determination. Results are precise [relative standard deviation ≤3.5% for 0.1% (w/v) H3PO3, n = 12] and in agreement with those obtained by gravimetry at 95% confidence level. |
publishDate |
2000 |
dc.date.none.fl_str_mv |
2000-12-01 2022-04-28T19:55:03Z 2022-04-28T19:55:03Z |
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/10.1002/1098-2728(2000)12:6<286 Laboratory Robotics and Automation, v. 12, n. 6, p. 286-290, 2000. 0895-7533 http://hdl.handle.net/11449/224182 10.1002/1098-2728(2000)12:6<286 2-s2.0-0034510707 |
url |
http://dx.doi.org/10.1002/1098-2728(2000)12:6<286 http://hdl.handle.net/11449/224182 |
identifier_str_mv |
Laboratory Robotics and Automation, v. 12, n. 6, p. 286-290, 2000. 0895-7533 10.1002/1098-2728(2000)12:6<286 2-s2.0-0034510707 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
Laboratory Robotics and Automation |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
286-290 |
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_ |
1808128564115013632 |