Organic Acid And Heavy Metals Solubilization In Soils Treated With Sewage Sludge
(Altafin, Leticia)
Organic acid and heavy metals solubilization in soils treated with sewage sludgeIn soils treated with sewage sludge, heavy metals concentration insolution is low and solubilization kinetics is slow. So, solublecomplex formation that occurs in the rhizosphere became to be importantin plant availability of these metals. Recent studies showed thatorganic acids released by roots, like acetic, citric, lactic, oxalicand tartaric acids, are important agents of solubilization andconsequently can change heavy metals availability. Solution of acetic,citric, lactic, oxalic and tartaric acids in concentrations: 0.4, 0.6,0.8, and 1.0 mol L-1 were used to extract Cd, Cu, Cr, Ni, Pb and Zn ofsoil samples treated with sewage sludge, in levels of 0, 40 and 80 Mgha-1. Soils samples were also used in a Neubauer essay with rice astest plant. Heavy metals concentrations in the plants harvested 18 daysafter the germination were correlated with metals quantities removedfrom the different Organic acid solutions. The results showed that Cuand Zn plant availability can be evaluated with all tested acids in alltested concentrations. Lactic and tartaric acids, 0.4 to 1.0 mol L-1,can be used to evaluate availability of Ni and oxalic acid, in allconcentrations, can be a Cr extractant. . In the treatment receiving 80Mg ha-1 of sewage sludge the Cd and Pb were not available as a resultit was not possible to determine the organic acids efficiency toevaluate the bioavailability of these elements.
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