106 



DESCRIPTION OF PLATES. 



Plate 38. A. Uranous Chloride in equal parts by volume of Water and Methyl Alcohol 

 (strip 1) to which is added increasing amounts of Sodium Chlorate dis- 

 solved in equal volumes of Water and Methyl Alcohol (succeeding strips). 

 This spectrogram shows very little of any selective action on the uranous 

 chloride water and alcohol bands. 

 B. Uranous Chloride in equal volumes of Water and Methyl Alcohol (strip 1) 

 to which Potassium Chlorate in Water and Methyl Alcohol is added 

 in increasing amounts (strips 2, 3, 4, and 5), and to which Hydrogen 

 Peroxide is added (strip 6). This spectrogram shows the selective action 

 of potassium chlorate on the uranous chloride water and methyl alcohol 

 bands. The water bands are seen to decrease in intensity, while the 

 alcohol bands increase in intensity. In this example the addition of 

 hydrogen peroxide seems to have oxidized only the alcoholated uranous 

 chloride. 



Plate 39. A. Uranous Chloride in equal volumes of Water and Methyl Alcohol (strip 1) 

 to which is added Sodium Chlorate in equal volumes of Water and Methyl 

 Alcohol (strip 2) in one case, and Potassium Chlorate in the other (strip 

 3). The last strip represents the absorption of uranous chloride in 

 methyl alcohol and ether. This plate shows the selective action of the 

 above salts on the water and alcohol bands. 

 B. Uranous Chloride in equal volumes of Water and Alcohol to which is added 

 Calcium Nitrate in 2 parts Water and 3 parts Methyl Alcohol (strip 1) ; 

 in 1 part Water and 1 part Methyl Alcohol (strip 2) ; and in pure Water 

 (strip 3). A corresponding addition of potassium nitrate was made, 

 the potassium nitrate being dissolved in 2 parts water and 3 parts 

 methyl alcohol (strip 4), 1 part water and 1 of alcohol (strip 5) and in 

 pure water (strip 6). The last strip represents the absorption of uranous 

 chloride itself in equal parts of water and methyl alcohol. This spec- 

 trogram shows the selective action of the salts on the uranous water and 

 alcohol bands. The selective action is particularly marked in the case of 

 potassium nitrate. The presence of this salt seems to weaken the alcohol 

 bands much less than the water bands, the proportion of water and alcohol 

 present being kept constant. 



Plate 40. A. Uranous Bromide in Water to which Methyl Alcohol is added. The con- 

 centration of the aqueous solution was 0.5 normal, and the percentages 

 of alcohol in the solution, starting with the first strip, were: 0, 24, 39, 

 49, 56, and 62. This spectrogram shows that in the case of uranous 

 "bromide at this temperature and concentration (the solution also con- 

 tains zinc bromide) it is necessary that the amount of alcohol required 

 to make the water and alcohol bands have approximately the same inten- 

 sity is about 1 }4 times that of the water present. 

 B. Uranous Chloride in acidified (Hydrochloric Acid) Ethyl Ester to which 

 Ethyl Alcohol is added. The absorption of the ester solution is very 

 similar to that of an aqueous solution. The spectrogram shows the much 

 greater absorbing power of the ethyl alcohol solution compared with the 

 ester solution, the amount of uranous chloride being kept constant. 



Plate 41. A. Uranous Chloride in Water and Methyl Alcohol (strip 1) to which are added 

 increasing amounts of Calcium Nitrate in 2 parts Water and 3 parts 

 Methyl Alcohol (strips 2, 3, 4), and finally Hydrogen Peroxide (strip 5). 

 The spectrogram shows that the original solution was almost entirely 

 free from uranyl chloride; that the addition of calcium nitrate had a 

 marked selective action on the uranous bands, the water bands being 

 greatly decreased in intensity while the alcohol bands became more 

 intense. The addition of hydrogen peroxide causes the complete disap - 

 pearance of the uranous bands and the appearance of the uranyl bands. 

 B. Uranous Bromide in 2 parts Water and 3 parts Methyl Alcohol (strip 1) 

 to which Hydrogen Peroxide (2 parts of a 3 per cent Hydrogen Peroxide 

 solution in Water with 3 parts of Methyl Alcohol) was added 5 drops at 

 a time (strips 2, 3, 4, 5, 6, and 7). Strip 1 shows that the oxidization of 

 the uranous chloride by the hydrogen peroxide is the same, as indicated 

 either by the intensity of the water bands or the alcohol bands. 



