Article révisé par les pairs
Résumé : It has been shown that the artificial contamination of the chromatographic cell is a simple and efficient means for learning the dimensions of stains, such as their migration velocities. The effect may affect the determination of chromatographic stains as has been shown in the case of chromate and tungstate. Twelve pairs of saturants and developers have been employed with various contaminants. The effect of the contamination has been followed qualitatively in the development of eight elements. The conjugated actions on the atmosphere of the chromatographic cell and on the composition of the development may be effective when the object is to discover better chromatographic conditions of separation. The action on the saturant presents the advantage of allowing the intervention of solvents which are not miscible or not soluble in each other. © 1954 Springer-Verlag.