Adsorpiton of Cu++ by Filter Paper

A phenomenon of adsorption of a small amount of ion by the filter paper was studied with the use of Cu++.The adsorption of Cu++ is not only caused by heretofore considered exchange of ash contained in the paper but a certain chemical combination with the cellulose, electrical or other physical adsorption is possible.Factors which have the influence on the amount of adsorption are concentration of solution, ash content, speed of filtration and temperature;especially, the influence of temperature is important from various standpoints.The liberation of adsorbed ion is difficult with the use of filter paper of high ash content and filtered at high temperature, The adsorption is increased with an increase in the concentration but these portions of increased adsorption are easily liberated by washing. Also, the change of adsorption phenomena of S2O3-- and Al+++ are studied and its mechanism is clarified.