Cadmium removal by living cells of the marine microalgaTetraselmis suecica
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Cadmium removal by living cells of the marine microalgaTetraselmis suecicaData
2002-09Cita bibliográfica
Pérez-Rama M, Abalde Alonso J, Herrero López C, Torres Vaamonde E. Cadmium removal by living cells of the marine microalgaTetraselmis suecica. Bioresour Technol. 2002;84(3):265-70.
Resumo
[Abstract] Cadmium removal by living cells of the marine microalga Tetraselmis suecica was tested in cultures exposed to different cadmium concentrations (0.6, 3, 6, 15, 30 and 45 mg/l). The EC50 for growth was 7.9 mg Cd/l after six days of exposure. The cadmium removed was proportional to the concentration of this metal in the medium and it was dependent on the time of exposure; cultures with higher cadmium concentration removed a higher amount of this metal. In cultures exposed to 0.6 mg/l, T. suecica cells removed 98.1% of added cadmium with 0.392x10-6ug Cd/cell, whereas in cultures with 45 mg/l only 7.7% was removed with 16.052x10-6ug Cd/cell. The highest amount of cadmium removed per liter of culture was observed in cultures exposed to 6 mg/l, with 3.577 mg/l of cadmium. After six days of incubation, the higher proportion of cadmium was bioaccumulated intracellularly in all cultures except in 45 mg/l cultures, the percentage of intracellular cadmium being always more than 50%. The highest percentage of bioadsorbed cadmium (60.1%) was found in cells of cultures with the highest cadmium concentration (45 mg/l). Furthermore, a relation between intracellular cadmium and the concentration of sulfhydryl groups was observed.
Palabras chave
Biosorption
Sulfhydryl groups
Tetraselmis suecica
Microalga
Cadmium removal
Bioaccumulation
Sulfhydryl groups
Tetraselmis suecica
Microalga
Cadmium removal
Bioaccumulation