Spectrophotometric determination of phosphite in fertilizers in a flow injection system with online sample preparation

Registro completo de metadados
MetadadosDescriçãoIdioma
Autor(es): dc.contributorUniversidade Estadual Paulista (UNESP)-
Autor(es): dc.creatorNeto, José Anchieta Gomes-
Autor(es): dc.creatorIto, Helenice Akemi-
Autor(es): dc.creatorDas Graças Fernandes, Kelly-
Autor(es): dc.creatorDe Moraes, Mercedes-
Autor(es): dc.creatorCardoso, Arnaldo Alves-
Data de aceite: dc.date.accessioned2025-08-21T16:46:51Z-
Data de disponibilização: dc.date.available2025-08-21T16:46:51Z-
Data de envio: dc.date.issued2022-04-28-
Data de envio: dc.date.issued2022-04-28-
Data de envio: dc.date.issued2000-12-01-
Fonte completa do material: dc.identifierhttp://dx.doi.org/10.1002/1098-2728(2000)12:6<286-
Fonte completa do material: dc.identifierhttp://hdl.handle.net/11449/224182-
Fonte: dc.identifier.urihttp://educapes.capes.gov.br/handle/11449/224182-
Descrição: dc.descriptionA 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.-
Descrição: dc.descriptionDepto. de Quim. Analítica Instituto de Química Paulista-UNESP, P.O. Box 355, 14801-970, Araraquara, SP-
Descrição: dc.descriptionDepto. de Quim. Analítica Instituto de Química Paulista-UNESP, P.O. Box 355, 14801-970, Araraquara, SP-
Formato: dc.format286-290-
Idioma: dc.languageen-
Relação: dc.relationLaboratory Robotics and Automation-
???dc.source???: dc.sourceScopus-
Título: dc.titleSpectrophotometric determination of phosphite in fertilizers in a flow injection system with online sample preparation-
Tipo de arquivo: dc.typelivro digital-
Aparece nas coleções:Repositório Institucional - Unesp

Não existem arquivos associados a este item.