to reach a final metal concentration of 20 mg/L. Then,
2.5 mg of biosorbent was added to thesolution,
and the pH was adjusted to 5.0 for Cu(II) and 5.5 for Pb(II).
They were then stirred for 7.5 and 10 min for Cu(II) andPb(II), respectively.
Then, Pb(II) and Cu(II) were analyzed usingFAAS