Die Verhinderung der Fällung einiger Metallhydroxyde aus ihren Lösungen durch Zuckerarten

Abstract

1. Es wurde eine experimentelle Untersuchung ausgeführt über die Verhinderung der Fällung von Zirkonium‐, Lanthan‐, Yttrium‐ und Uranylhydroxyd durch Alkali.

Contributions to the Chemistry of Indium. IV. The Effects of Certain Poly-hydroxy Non-electrolytes upon the Precipitation of Hydrous Indium Hydroxide.

“…Such effects were originally ascribed to the formation of complexes between the metal ion and the added non-electrolyte (5, 7, 13), although Graham (5) also recognized the presence of colloidal oxide particles. It is now believed, however, that in most instances the hydrous oxide or hydroxide is peptized by the excess hydroxyl ion from the added base in the presence of the polyhydroxy compounds (3,9,10,14,15,(17)(18)(19)(20)(21), for such solutions contain negatively charged colloidal particles (17,21) and have the same conductivities as suspensions formed in the absence of the nonelectrolytes (2). On the other hand, evidence has been presented for complex formation in the cases of copper (22,23), bismuth (8), and zirconium (1).…”

An Investigation of Certain Properties of Hydrous Lanthanum Hydroxide Sols.

“…Hydrous lanthanum hydroxide sols have been prepared by several investigators. The methods used have included dialysis after the addition of small amounts of ammonia to lanthanum acetate solutions (6,1), electrolysis of a lanthanum chloride solution using a mercury cathode (14), peptization of the freshly precipitated and well-washed hydroxide with dilute hydrochloric acid (2, 9), addition of less than 2.6 equivalents of sodium hydroxide to solutions of lanthanum nitrate or chloride (3,17), and the "peptization" of lanthanum hydroxide with sucrose or levulose (18).…”