Electrochromatographic Separation of Silver and Thallium Ions from Each Other and from Mixtures of Various Polyvalent Cations

Separation of the Alkali Metal Cations from Mixtures of Various Cations by Electrochromatography

“…; and cesium, 34.0 cm. Spraying the aqueous portion of the electrochromatogram with yellow ammonium sulfide proved that silver and thallium were complexed and migrated as anions, as would any multivalent ions included in the mixture (7).…”

“…The recoveries are within the experimental limits inherent in the flame-photometric determination of known amounts of the alkali metals. In each case, spraying with yellow ammonium sulfide proved the silver and thallium migrated toward the anode, as would any multivalent ions included in the sample (7).…”

“…The H-shaped paper was used for the separation of the alkali metal ions from mixtures of various other ions; the rectangular paper was used for the separation of the alkali metal ions from one another as well as from the mixture. It was placed on a water-cooled copper plate (7) and saturated with the background solution to be used. The excess solution was removed.…”

“…Two background solutions were used in this work. One was an aqueous solution xvhich was 0.0125M in ammoniatriacetic acid (nitrilotriacetic acid), 0.1 M in ammonia, and 0.05M in hydrocyanic acid (7). The other was a nitromethane solution, 0.2M in ammonium formate and 0.4AÍ in trichloroacetic acid (8).…”

“…Previous reports have shown: that the alkali metal ions are partially separated from one another and from various alkaline earth ions by electrochromatography in aqueous solutions containing ammonium salts of complex-forming acids (4) I that sodium, potassium, rubidium, and cesium can be completely separated from one another by electrochromatography in nonaqueous solvents such as nitromethane (8); and that the univalent ions of silver and thallium can be separated from each other and from various multivalent ions by migration in an aqueous solution in which complexing and pH control are employed (7). This paper is concerned with an extension of these observations, so that all the alkali metal ions can be separated quantitatively in aqueous solution from univalent silver, thallium, and mercurous ions as well as from various multivalent ions.…”