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| Registros recuperados : 28 | |
| Registros recuperados : 28 | |
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 | Acesso ao texto completo restrito à biblioteca da Embrapa Unidades Centrais. Para informações adicionais entre em contato com biblioteca@embrapa.br. |
Registro Completo
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Biblioteca(s): |
Embrapa Unidades Centrais. |
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Data corrente: |
06/03/2000 |
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Data da última atualização: |
23/05/2005 |
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Autoria: |
COCHRANE, T. T.; SOUSA, D. M. G. de. |
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Afiliação: |
CPAC. |
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Título: |
A field test for ferrous iron and ferric-organic complexes in cerrados soils. |
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Ano de publicação: |
1986 |
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Fonte/Imprenta: |
Pesquisa Agropecuaria Brasileira, Brasilia, v.21, n.3, p.327-330, mar. 1986. |
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Idioma: |
Inglês |
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Conteúdo: |
A 0.1 M solution of barium chloride containing 1,10 - phenanthroline indicator gave a satifactory 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 ferri-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 vial exposed to light in contrast with no colour change in the other, indicates the presence of ferric-organic complexes. |
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Categoria do assunto: |
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Marc: |
LEADER 01302naa a2200133 a 4500
001 1104287
005 2005-05-23
008 1986 bl uuuu u00u1 u #d
100 1 $aCOCHRANE, T. T.
245 $aA field test for ferrous iron and ferric-organic complexes in cerrados soils.
260 $c1986
520 $aA 0.1 M solution of barium chloride containing 1,10 - phenanthroline indicator gave a satifactory 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 ferri-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 vial exposed to light in contrast with no colour change in the other, indicates the presence of ferric-organic complexes.
700 1 $aSOUSA, D. M. G. de
773 $tPesquisa Agropecuaria Brasileira, Brasilia$gv.21, n.3, p.327-330, mar. 1986.
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