Use este identificador para citar ou linkar para este item: http://www.alice.cnptia.embrapa.br/alice/handle/doc/122762
Unidade da Embrapa/Coleção:: Área de Informação da Sede - Artigo em periódico indexado (ALICE)
Data do documento: 15-Jan-2008
Tipo do Material: Artigo em periódico indexado (ALICE)
Autoria: PIRES, A.M.M.
MARCHI, G.
MATTIAZZO, M.E.
GUILHERME, L.R.G.
Informaçães Adicionais: Embrapa Meio Ambiente
Título: Organic acids in the rhizosphere and phytoavailability of sewage sludge-borne trace elements
Edição: 2007
Fonte/Imprenta: Pesquisa Agropecuária Brasileira, Brasília, v. 42, n.7, p. 917-924, jul. 2007
Idioma: en
Palavras-chave: biosolid
exudates
availability
biossólido
exsudatos
metais pesados
disponibilidade.
Conteúdo: The aim of this work was to quantify low molecular weight organic acids in the rhizosphere of plants grown in a sewage sludge-treated media, and to assess the correlation between the release of the acids and the concentrations of trace-elements in the shoots of the plants. The species utilized in the experiment were cultivated in sand and sewage sludge-treated sand. The acetic, citric, lactic, and oxalic acids, were identified and quantified by high performance liquid chromatography in samples collected from a hydroponics system. Averages obtained from each treatment, concentration of trace elements in shoots and concentration of organic acids in the rhizosphere, were compared by Tukey test, at 5% of probability. Linear correlation analysis was applied to verify an association between the concentrations of organic acids and of trace elements. The average composition of organic acids for all plants was: 43.2, 31.1, 20.4 and 5.3% for acetic, citric, lactic, and oxalic acids, respectively. All organic acids evaluated, except for the citric acid, showed a close statistical agreement with the concentrations of Cd, Cu, Ni, and Zn found in the shoots. There is a positive relationship between organic acids present in the rhizosphere and trace element phytoavailability.
NAL Thesaurus: heavy metals.
Ano de Publicação: 2007
Aparece nas coleções:Artigo em periódico indexado (AI-SEDE) / Embrapa Informação Tecnológica (SCT)

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