steiger: analysis of deep well water 423 



6. The ''mean relative discrepancy" of all the determinations 

 is probably the best single index of the agreement of a mineral 

 analysis with a chemical formula. 



CHEMISTRY. — Note on the analysis of water fro??i a deep well 

 in Pennsylvania. George Steiger, Geological Survey. 



The well from which the water was obtained is situated eight 

 miles southwest of Imperial, Allegheny County, and five miles 

 northwest of McDonald, Washington County, Pennsylvania. ^ 

 Down to 6300 feet the well was perfectly dry; at this point water 

 was encountered and finally filled the well to a depth of 3000 feet. 



At the request of Dr. G. F. Becker, the Peoples Gas Company, 

 owners of the well, collected two samples of five gallons each. 

 One sample was sent to the laboratory of the Bureau of Mines 

 at Denver for radioactive tests; the other was shipped to the 

 laboratoiy of the U. S. Geological Survey for the general chemi- 

 cal analysis. 



Grams per Kilogram of Water 



Fe 0.16 SO4 0.05 



Mg 2.48 CI 161 .80 



Ca 25.19 Br 0.70 



Sr 3.55* I 



Ba trace 



Na 64.55 263.64 



K 5.16 Sp. G 1.211 



112.5 X 10~" grams of radium per liter. 



Silicon, aluminum, titanium, phosphorus, manganese, lead, bismuth, and 

 carbonic acid, were tested for and were found to be absent. 



* Equivalent to 7.8 grams of SrCl2 per liter. 



This water contains about eight times the cjuantity of dissolved 

 salts per kilogram as that of sea-water. When received, a quan- 

 tity of suspended matter was present, probably finely divided 

 rock introduced through the process of drilling. This was sep- 

 arated by filtration and the filtrate which was perfectly clear 

 was used for analysis. Dr. Becker who will be assisted by Mr. 

 C. E. Van Orstrand, in the near future, intends studying the 

 well regarding temperature and radioactivity. It was in rela- 



1 A complete description of this well by I. C. White will be found in the Bulle- 

 tin of the Geological Society of America, 24: 273-282. 1913. 



