抄録
Many suitable developing agents have been reported on the separation of Ca, Sr, and Ba by paper chromatography. The authors obtained good results by using ethanol-HCl and ethanol-HNO3 systems as the developing agents. Solutions composed of ethanol, 6 N acid, and water made up to 100 vol. have been tested, among which those containing a constant amount of ethanol with increasing amount of the acid gave gradual decrease in Rf values in all those elements, while those with a constant amount of the acid and increasing amounts of ethanol gave rapid decrease in Rf values. Increasing the amount of water gave larger Rf values but the separation of Ca and Sr became difficult; also the detection was difficult due to diffusion. A solution composed of ethanol 6080, 6 N HCl or 6 N HNO3 10, and water 3010 gave especially good results for the separation of the three; and there was no change in Rf values when chlorides or nitrates were used. By using an ethanol-HCl system, detection of Sr and Ba was possible in a solution containing a large amount (500 times as much) of Ca.
