“…Among trace elements, hydrolyzates located in the third and fourth column of the Periodic Table are the most likely to be affected by sorption processes and colloidal transport, as follows from recent ultrafiltration experiments [2][3][4][5]. In contrast to a large number of studies devoted to adsorption and colloidal behavior of divalent metals, rare earth elements, and actinides in aquatic systems [6][7][8][9][10][11][12][13][14][15], very little is known on interface equilibria of less common "insoluble" trivalent and tetravalent elements (Al, Sc, Ti, Cr, Ga, Ge, Y, Zr, In, Hf, Tl) [16][17][18][19]. Until recently, progress in studying the adsorption of these elements has been significantly hampered by ana-…”