Horacio A. Mottola

Effect of pore size on the capacity of sislca-immobilized 8-quinolinol

Abstract Optimization of the pore sizes of various silica gels used as supports in the immobilization of 8-quinolinol is described. Increased capacity is observed as pore size decrease to the opt? at about 6 nm. At smaller pore sizes, steric effects appear to predominate, ? capacities decrease sharply. An explanation for these effects is proposed, it was confirmed by using molecular models.

Absorptiometric determination of bismuth with thorin

Abstract A simple, precise absorptiomotric method for bismuth based upon its reaction with Thorin is described. The effect of foreign elements was established.

Removal of interferences in absorptiometric determination of bismuth with thorin

Abstract Bismuth can be separated by ion-exchange adsorption on Dowex 21 K resin from ca. 0.25 M HCl, after removal of volatile interferences by distillation in acid-oxidizing medium. Bismuth is eluted from the column with 1 M sulfuric acid. The method is useful in the absorptiometric determination of bismuth with thorin, as well as in other photometric methods.