there was no significant variation in extraction
efficiency between 250 and 750 mL of methanol and the extraction
recovery was quantitative. The extraction efficiency slightly
decreased when the volume of methano lexceeded 1000 mL. It is
clear that an increase in the volume of methanol results in an
increase in the solubility of the complex. Therefore,the extraction
recovery decreases. Thus,500 mL of methanol was selected as the
optimum volume in order to achieve a better cloudy solution.