1909.] OF VARIOUS SALTS IN SOLUTION. 205 



the acetate the bands were more intense than for the more concen- 

 trated solution. There was no noticeable change in the position 

 of the bands. Neither the intensity nor the position of the uranyl 

 nitrate or the uranyl sulphate bands was changed by the above 

 dilution. 



A more detailed study was made as to whether Beer's law holds 

 for uranyl nitrate and for the other uranyl salts. The method 

 of taking the spectrograms is the same as that used for the potas- 

 sium salts. 



Beer's law was found to hold for dilute solutions of uranyl 

 nitrate in water. When the concentration is greater than .5 normal 

 the absorption is greater than it should be if Beer's law held. 



(d) Uranyl Nitrate in Methyl Alcohol. 



In methyl alcohol the general appearance of the absorption is 

 very similar to that of the aqueous solution ; the blue-violet, the 

 ultra-violet, and uranyl bands appearing under the same general 

 conditions that they appear for aqueous solutions. There is a very 

 marked deviation from Beer's law for the more concentrated solu- 

 tions, however; the absorption of concentrated solutions being 

 greater than it would be if Beer's law held. The positions of the 

 bands are quite different from the positions of the uranyl bands 

 of the aqueous solution, or of the crystals, as shown by the follow- 

 ing values : 



abcdefghi 

 X 4930 4760 4610 4455 4325 4190 4070 3965 385s 



{e) Uranyl Nitrate in Mixtures of Methyl Alcohol and Water. 



In the previous work of Jones and Anderson'' it was found that 

 in some cases (for example neodymium chloride) a salt in water 

 had a different set of absorption bands compared with the same 

 salt in another solvent as, e. g., methyl alcohol. 



When the salt is dissolved in mixtures of these two solvents, 

 say methyl alcohol and water, it was found that as the amount of 

 one solvent, methyl alcohol for instance, decreased the methyl 



"Publication No. no, Carnegie Institution of Washington. 



