The conditions for the measurement for Pb were: lamp 5 mA; wavelength
324.8 nm; air flow 13.5 L/min; flame air/acetylene; acetylene flow
2 L/min. For Cd, similar condition was used except for the wavelength
fixed, for this case, at 228.8 nm and, in the case of Cu, a
4.5 mA lamp was used at 324.8 nm. Biosorption capacity for every
material was calculated by