The adsorption process of four metals in solution (Pb, Cu, Zn, Cd) toChlorella Vulgariswill be described and compared to a previous study using three metals (Pb,Cu,Zn) in solution. The binding capacity ofChlorella Vulgaristo four elements simultaneously increases with time, mass of algae, and up to a temperature of about 20.0°C. The equilibrium points for binding three metals simultaneously are at pH=4.55, with 7 mg of algae, and after 2.0 hrs. in a 5 ml aliquot of the solution. In the four metal system, the optimum values are significantly higher while the binding capacity is reduced. The competition between metals for binding sites in the algal cells is governed by kinetic properties as related to the pH, mass of algae, time, and concentration of solution. The binding process is also dependent upon thermodynamics with respect to the temperature of the solution.