Fig. 3

Adsorption of molybdenum by synthetic melanin. Levels of melanin-bound molybdenum (closed circle) and unbound molybdenum (open circle) molybdenum incubated in water for the indicated time (a) and equilibrium data (b) and Langmuir isotherm (c) for adsorption of molybdenum by synthetic melanin are presented. Consistent results were obtained by the experiment independently repeated three times, and representative result results are presented. Qe (μg/mg), amount of molybdenum adsorbed by melanin at equilibrium; Ce (μg/ml), concentration of molybdenum in solution at equilibrium; Qmax (131 μg/mg), maximum adsorption capacity