Precipitation and Complex Formation of Zirconium(IV) with Malonic, Succinic and Adipic Acids at 298 K

Using the tyndallometric technique, the precipitation of zirconium( IV) from aqueous solution of zirconyl chloride (1 mM) was investigated, in the presence of dicarboxylic acids: malonic, succinic and adipic, at pH 2-10 and 298 K. In the precipitation diagram only one region at pH < 2 exists in which zirconium is water- soluble with these acids. Polymeric, insoluble compounds of the composition Zr(OH)3HA (A = malonate, succinate, adipate ligands) were isolated at 2 3 continuous increase of zirconium percentage in precipitate with pH increasing was observed in all samples, due to zirconium hydroxide coprecipitatio