154- Thornton, Jr.— Separation of Thorium from Iron. 



acetate whs added, the volume made up to 400 cm 3 or 500 cm' 

 aud a 5 per cent " cupferron " solution added in decided excess. 

 From this point on the determination was made just as in the 

 ca6e of thorium alone. Table II contains the results of three 

 experiments. 



Table II. 



The Separation of Thorium from Iron. 



Th0 2 Fe 2 O s ThO a Vol. of 



taken taken found Error C2H3O2NH4 Solution 



No. grm. grm. grin. grm. grm cm 3 



3 0-0924 0-1018 0-0922 —0-0002 25 400 



4 0*0924 0-1018 0-0916 —0-0008 25 500 



5 0-1840 0-1018 0-1840 —0-0006 25 400 



A separation of thorium from iron with the aid of the " cup- 

 ferron " reagent has been satisfactorily worked out and the 

 experimental data show a fair degree of accuracy. Let the 

 reader distinctly understand, however, that the above process 

 is not offered as an analytical method for practical purposes. 

 The well-known oxalate* precipitation is satisfactory and 

 separates thorium from nearly all the common elements with 

 which it is likely to be associated. But another link has been 

 added to the chain of " cupferron " results and some com- 

 parative data on titanium, zirconium and thorium with respect 

 to this remarkable reagent have been brought to light, which 

 it is hoped will prove of interest. 



Finally the author wishes to state that the experimental part 

 of the work on thorium was carried out in the laboratory of 

 the College of the City of New York and to thank Professor 

 Charles Baskerville for fostering the investigation. 



Wilmington, Delaware, 

 June 6, 1916. 



*See E. Benz, Zs. angew. Chem., xv, 297, 1902. 



