OBSERVATIONS ON THE CORROSION OF STEEL IN WATER. 



73 



Table IV — continued. 



Solution. 



*Coonamble, No. 2 

 containing "04% 



Bore, water 

 total solids, 



chiefly bicarbonate of calcium 



and sodium. 



Water containing "12% sodium 

 bicarbonate, 05% magnesium 

 sulphate, "07% sodium chloride. 



Water containing 

 sulphate. 



0-2°/ ferrous 



Water containing "25% potassium 

 hydrate. 



Water containing '25' 

 cyanide. 



potassium 



Weight of 

 Steel strip. 



64-300 

 65-128 

 65-246 

 64-986 



65-640 

 64-850 

 64490 



62-766 

 64-725 



64-561 



65-914 



Loss of 



weight after 



37 days. 



0-298 

 0284 

 0-282 

 0-284 



0-240 



0-269 

 0-267 



0-304 

 0-312 



0-002 



Average loss 

 of weight. 



0-287 



0-258 



0-308 



0002 



* These waters contain all the carbonate present as bicarbonate. They 

 contain besides carbonates small quantities oj chlorides and sulphates of 

 sodium, potassium and calcium. They contain a little free carbon dioxide. 



The water from Coonamble No. 2 bore was tested [by- 

 Mr. G. Wright, a demonstrator in the Chemical Depart- 

 ment] for radioactivity by boiling out all the dissolved gases 

 and bringing these inside a gold leaf electroscope (in vacuo). 

 The radioactivity of the emanation from 1 litre of solution, 

 after three days had elapsed from the time the sample 

 was collected, was equal to that of the emanation obtain- 

 able from '0005 grams uranium, from pitch blende. This 

 corresponds on Boltwood's scale to an initial activity of 

 90 X 10 -4 grams uranium per litre of water. As the 

 activity of the emanation decayed to one half its value in 

 four days it may be considered to be radium emanation. 

 Boltwood 1 has examined a large number of waters from 



1 American Journ. of Sci„ 1904, iv 18, p. 378, ibid. 1905, iv 20, p. 128. 



