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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. O objetivo deste estudo foi quantificar ácidos orgânicos de baixo peso molecular presentes na rizosfera de plantas cultivadas na presença de lodo de esgoto e avaliar a correlação entre a liberação dos ácidos e a concentração de elementos-traço nas plantas. As espécies utilizadas no experimento foram cultivadas em areia e areia com lodo de esgoto. Os ácidos acético, cítrico, lático e oxálico foram identificados e quantificados por cromatografia líquida de alta eficiência em amostras coletadas de um sistema hidropônico. As médias obtidas em cada tratamento, para concentração de elementos-traço na parte aérea e para concentração de ácidos orgânicos rizosféricos, foram comparadas pelo teste de Tukey, a 5% de probabilidade. A análise de correlação linear foi utilizada para verificar a associação entre as concentrações de ácidos orgânicos e elementos-traço. A média de composição dos ácidos orgânicos para todas as plantas foi 43,2, 31,1, 20,4 e 5,3%, para os ácidos acético, cítrico, lático e oxálico, respectivamente. Todos os ácidos orgânicos, com exceção do cítrico, correlacionaram-se com as concentrações de Cd, Cr, Cu, Ni e Zn na parte aérea das plantas. Existe associação entre ácidos orgânicos rizosféricos e fitodisponibilidade de elementos-traço

Organic acids in the rhizosphere and phytoavailability of sewage sludge-borne trace elements