1. Experimental silica fume over 1 g Co-Pc 0.015 g DMF solution in measuring the absorbance with UV. Wavelength absorption maximum at 660 nm, and sampled every one hour calculate the percentage adsorption Co-Pc on the silica support then calculated the amount of Co-Pc in silica in trials tend percentage adsorption. higher during the first hour and trends on a fixed heel end of the four trials. Hours are absorbing the 28.2,30.9,34.4 percent and 37.7 respectively (as shown) and calculate the amount of silica is as follows: Co-Pc on 4.2283,4.6296,5.1543 and 5.6481, respectively (see picture).