A field test for ferrous iron and ferric-organic complexes in cerrados soils

Detalhes bibliográficos
Autor(a) principal: Cochrane, Thomas T.
Data de Publicação: 2014
Outros Autores: Sousa, Djalma M. G. de
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Pesquisa Agropecuária Brasileira (Online)
Texto Completo: https://seer.sct.embrapa.br/index.php/pab/article/view/14753
Resumo: A 0.1 M solution of barium chloride containing 1,10 - phenanthroline indicator gave a satisfactory field test for exchangeable and water-soluble ferrous iron in Cerrados soils. A 1 ml subsample of soil is added to a vial containing 5 ml of the solution and shaken for 20 seconds. An orange-red colour indicates the presence of ferrous iron. The presence of ferric-organic complexes in soils can also be detected, as the reduction of ferric to ferrous iron in the presence of oxidisable organic ligands is a photochemical process. Subsamples of soils are added to two separate vials containing the solution and shaken for 20 seconds. One vial is kept in the dark and the other exposed to sunlight. After five to fifteen minutes, the development of an orange-red colour in the vial exposed to light in contrast with no colour change in the other, indicates the presence of ferric-organic complexes.
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spelling A field test for ferrous iron and ferric-organic complexes in cerrados soilsTestes de campo para ferro ferroso e complexos férrico-orgânicos em solos de CerradoA 0.1 M solution of barium chloride containing 1,10 - phenanthroline indicator gave a satisfactory field test for exchangeable and water-soluble ferrous iron in Cerrados soils. A 1 ml subsample of soil is added to a vial containing 5 ml of the solution and shaken for 20 seconds. An orange-red colour indicates the presence of ferrous iron. The presence of ferric-organic complexes in soils can also be detected, as the reduction of ferric to ferrous iron in the presence of oxidisable organic ligands is a photochemical process. Subsamples of soils are added to two separate vials containing the solution and shaken for 20 seconds. One vial is kept in the dark and the other exposed to sunlight. After five to fifteen minutes, the development of an orange-red colour in the vial exposed to light in contrast with no colour change in the other, indicates the presence of ferric-organic complexes.Uma solução 0,1 molar de cloreto de bário, contendo o indicador 1,10 - fenantrolina, pode ser utilizado como um teste satisfatório feito no campo para detectar a presença de ferro ferroso trocável e solúvel em água nos solos de Cerrados. Este teste consta da adição de 5 ml da solução de cloreto de bário + 1,10 - fenantrolina a 1 ml de solo com agitação por 20 segundos. O desenvolvimento da cor laranja-avermelhado indica a presença de ferro ferroso. A presença de complexos férrico-orgânicos pode também ser detectada, pela redução do ferro férrico a ferroso na presença de ligantes orgânicos oxidáveis por um processo fotoquímico. Subamostras de solos são adicionadas em dois frascos distintos, contendo a solução de cloreto de bário + 1,10 - fenantrolina e agitados por 20 segundos. Um frasco é guardado no escuro e o outro é exposto à luz solar. Dentro de cinco a quinze minutos uma cor laranja-avermelhado é desenvolvida no frasco exposto à luz, enquanto no frasco que permaneceu no escuro no há mudança de cor, o que indica a presença de complexos férricos orgânicos.Pesquisa Agropecuaria BrasileiraPesquisa Agropecuária BrasileiraCochrane, Thomas T.Sousa, Djalma M. G. de2014-04-17info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionapplication/pdfhttps://seer.sct.embrapa.br/index.php/pab/article/view/14753Pesquisa Agropecuaria Brasileira; v.21, n.3, mar. 1986; 327-330Pesquisa Agropecuária Brasileira; v.21, n.3, mar. 1986; 327-3301678-39210100-104xreponame:Pesquisa Agropecuária Brasileira (Online)instname:Empresa Brasileira de Pesquisa Agropecuária (Embrapa)instacron:EMBRAPAenghttps://seer.sct.embrapa.br/index.php/pab/article/view/14753/8436info:eu-repo/semantics/openAccess2014-10-17T19:41:59Zoai:ojs.seer.sct.embrapa.br:article/14753Revistahttp://seer.sct.embrapa.br/index.php/pabPRIhttps://old.scielo.br/oai/scielo-oai.phppab@sct.embrapa.br || sct.pab@embrapa.br1678-39210100-204Xopendoar:2014-10-17T19:41:59Pesquisa Agropecuária Brasileira (Online) - Empresa Brasileira de Pesquisa Agropecuária (Embrapa)false
dc.title.none.fl_str_mv A field test for ferrous iron and ferric-organic complexes in cerrados soils
Testes de campo para ferro ferroso e complexos férrico-orgânicos em solos de Cerrado
title A field test for ferrous iron and ferric-organic complexes in cerrados soils
spellingShingle A field test for ferrous iron and ferric-organic complexes in cerrados soils
Cochrane, Thomas T.
title_short A field test for ferrous iron and ferric-organic complexes in cerrados soils
title_full A field test for ferrous iron and ferric-organic complexes in cerrados soils
title_fullStr A field test for ferrous iron and ferric-organic complexes in cerrados soils
title_full_unstemmed A field test for ferrous iron and ferric-organic complexes in cerrados soils
title_sort A field test for ferrous iron and ferric-organic complexes in cerrados soils
author Cochrane, Thomas T.
author_facet Cochrane, Thomas T.
Sousa, Djalma M. G. de
author_role author
author2 Sousa, Djalma M. G. de
author2_role author
dc.contributor.none.fl_str_mv

dc.contributor.author.fl_str_mv Cochrane, Thomas T.
Sousa, Djalma M. G. de
dc.subject.none.fl_str_mv

description A 0.1 M solution of barium chloride containing 1,10 - phenanthroline indicator gave a satisfactory field test for exchangeable and water-soluble ferrous iron in Cerrados soils. A 1 ml subsample of soil is added to a vial containing 5 ml of the solution and shaken for 20 seconds. An orange-red colour indicates the presence of ferrous iron. The presence of ferric-organic complexes in soils can also be detected, as the reduction of ferric to ferrous iron in the presence of oxidisable organic ligands is a photochemical process. Subsamples of soils are added to two separate vials containing the solution and shaken for 20 seconds. One vial is kept in the dark and the other exposed to sunlight. After five to fifteen minutes, the development of an orange-red colour in the vial exposed to light in contrast with no colour change in the other, indicates the presence of ferric-organic complexes.
publishDate 2014
dc.date.none.fl_str_mv 2014-04-17
dc.type.none.fl_str_mv
dc.type.driver.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
format article
status_str publishedVersion
dc.identifier.uri.fl_str_mv https://seer.sct.embrapa.br/index.php/pab/article/view/14753
url https://seer.sct.embrapa.br/index.php/pab/article/view/14753
dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv https://seer.sct.embrapa.br/index.php/pab/article/view/14753/8436
dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv Pesquisa Agropecuaria Brasileira
Pesquisa Agropecuária Brasileira
publisher.none.fl_str_mv Pesquisa Agropecuaria Brasileira
Pesquisa Agropecuária Brasileira
dc.source.none.fl_str_mv Pesquisa Agropecuaria Brasileira; v.21, n.3, mar. 1986; 327-330
Pesquisa Agropecuária Brasileira; v.21, n.3, mar. 1986; 327-330
1678-3921
0100-104x
reponame:Pesquisa Agropecuária Brasileira (Online)
instname:Empresa Brasileira de Pesquisa Agropecuária (Embrapa)
instacron:EMBRAPA
instname_str Empresa Brasileira de Pesquisa Agropecuária (Embrapa)
instacron_str EMBRAPA
institution EMBRAPA
reponame_str Pesquisa Agropecuária Brasileira (Online)
collection Pesquisa Agropecuária Brasileira (Online)
repository.name.fl_str_mv Pesquisa Agropecuária Brasileira (Online) - Empresa Brasileira de Pesquisa Agropecuária (Embrapa)
repository.mail.fl_str_mv pab@sct.embrapa.br || sct.pab@embrapa.br
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