To examine the effect of the sorbent amount, a series of sample solutions were studied using 500 mL methanol containing different amounts (0.2–10.0%)of benzophenone. As Fig. 3 shows,the
extraction recovery increased as the amount of benzophenone increased from 0.2 to 1.0%, as was expected.Further increase of the amount of benzophenone to 10.0% did not have any effecton
extraction recovery. Therefore, 1.0% of the benzophenone was selected as the optimum amount of the sorbent for further studies. Also, the effect of the sorbent amount on the size of the dispersed particles was investigated. The particle size distributions were
measured by DSL, and the results showed that the average size of the particles changed and increased from 500 to 1500 mm by increasing the amount of sorbent.