fairchild: mineral sulphide water 



563 



TABLE 2 



Table Showing the Behavior ok NaSH and NaHCOa Alone When Boiled 



IN Hydrogen 



a Same room temperature for 1^/4 hours: CO2 87.7; S 24.4. 

 b Very rapid boiling. 

 c Hi.ffh. 



The percentages shown indicate that the fixed COo remains 

 fairly constant. The figure for volatile COo ranged from 0.006 

 to 0.014 gm., depending on the rate of boiling and the flow of 

 hydrogen. This rate has a more marked effect on the amount 

 of volatile sulphide as well. An effort was therefore made to 

 pass the hydrogen at as nearly a uniformly rapid rate as possible. 

 In all the tests made the sum of fixed and volatile COo was 

 within 0.00 1 to 0.003 g^i- of the total present. The quantities 

 of sulphide were in closer agreement with the total present, 

 about o.ooi gm. Because of the greater ease in dealing with the 

 fixed sulphide left in the flask, this portion was determined iodo- 

 metrically, and the volatile sulphide was obtained by difference. 

 From time to time blank tests for COo were made in order to 

 check up the apparatus, no blank of more than o.ooi gm. being 

 accepted. Most blanks were nearly zero. 



Another solution was now prepared, containing magnesium 

 chloride in an amount equal to that present in the natural water 

 to be analyzed, namely, about 3.3 gm. MgClo.6HoO per liter. 

 It was thought possible that such a solution might on boiling 

 show hydrolysis of the MgClo, the effect of which would be to 

 liberate more half -bound COo than had been recovered above. 



