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)