38 



THE DETEEMINATTON OF LITHIUM. 



produce the line. With the Kriiss spectroscopic apparatus regularly 

 employed, using a Bunsen burner, the following figures were obtained : 



Results obtained ivith spectroscope, using a Bunsen burner. 



SUMMARY. 



1. In this paper are considered various quantitative methods of 

 separating lithium from the other metals. Some of them have been 

 tested in the Bureau of Chemistry and the method of Gooch/ modi- 

 fied slightly in some details of manipulation, has proven entirely 

 satisfactory, when weighable amounts are present. 



2. Satisfactory results are obtained by the spectroscopic estimation 

 of lithium according to the methods of Ballmann,^ Bell,^ or Foehr,'* 

 when modified by applying them to the alkalis extracted mth amyl 

 alcohol by the Gooch method. 



3. Contrary to the statement of Ranzoli •"' the quantitative spec- 

 troscopic method is not found preferable to the Gooch method for 

 weighable amounts of lithium. 



4. Approximate spectroscopic determinations regularly made of 

 quantities of lithium, potassium, barium, strontium, and calcium are 

 very often of great service as a guide to the proper procedure in 

 analyses. 



1 Amer. Chem. J., 1887, 9,- 33-51. 



2 Zts. anal. Chem., 1875, U; 297. 



3 Amer. Chem. J., 1885, 7; 35. 



■• Chem. Ztg., 18S5, 9; 1013. 



6 Gaz. chim. ital., 1901, 31 (I): 40. 



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