Resumen

SOLIS PACHECO, Josué et al. Ability of Phanerochaete chrysosporium and Trametes versicolor to remove Zn²⁺, CR³⁺, Pb²⁺ metal ions. Terra Latinoam [online]. 2015, vol.33, n.3, pp.189-198. ISSN 2395-8030.

The use of fungal biomass as an alternative for removing heavy metals has become increasingly important in recent years, replacing conventional methods based on chemical physical processes. In this study, we evaluated the biosorption of Zn2+, Cr3+ and Pb2+, which were analyzed to determine their effect on growth kinetic parameters of Phanerochaete chrysosporium strain ATCC 32629 and Trametes versicolor ATCC 1267. Growth kinetics were performed in four liquid culture media: 1) Yeast Nitrogen Base (YNB) used as control, 2) YNB medium plus Pb2+ (0.25, 1 and 2 mg L-1), 3) YNB medium plus Zn2+ (5, 10 and 20 mg L-1) and 4) YNB medium plus Cr3+ (0.5, 1 and 2 mg L-1). The flasks were incubated at 25 °C with shaking at 150 rpm. Metal concentrations were determined by inductively coupled plasma atomic emission spectroscopy (ICP-AES) with prior acid digestion of the sample. The results demonstrated that Phanerochaete chrysosporium ATCC 32629 and Trametes versicolor ATCC 12679 are able to grow in the culture medium with Pb2+, Zn2+ and Cr3+ ions at different concentrations. However, P. chrysosporium ATCC 32629 showed greater adaptability and ability to adsorb Cr3+ in the culture medium at concentrations of 0.5 and 1 mg L-1, whereas T. versicolor ATCC 12679 was capable of Pb2+ biosorption at concentrations of 0.25, 1 and 2 mg L-1.

Palabras llave : fungal biomass; biosorption; bioremediation; growth parameters; heavy metals.

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