of salt in deionized water and at constant PH
value (about 3) by adding small volumes of acids
or bases concentrated solutions. The 1 gm/L
solution of metal ions (Zn(II) and Cu(II)) was
obtained by metal sulphate salt dissolving in
deionized and distillate water, the initial metal ion
concentration was varied by taking 0.25, 0.5, 1
and 2 mL of the 1 gm/L metal ion solution
prepared.