148 S. G. WALTON. 



A COMPLETE ANALYSIS OF SYDNEY WATER. 

 By Sidney G. Walton, f.c.s. 



(Communicated by the Government Analyst, W. M. 

 Hamlet, Esq., f.i.c., f.c.s.) 



[Read before the Royal Society of N. S. Wales, September 1, 1909-1 



So far as I am aware a complete analysis of Sydney water 

 has never been published. For this reason I thought it 

 would be of interest to carry out such an examination and 

 to place the results before the members of this Society. 



The water used for the analysis was taken from a tap 

 in the water analysis room of the Government Laboratory, 

 Department of Public Health, and may be considered a 

 fair sample of the average supply. 



In order to estimate more accurately those constituents 

 occurring in small amount, large quantities of the water 

 were taken. 



As the most important use of the water is for drinking 

 and domestic purposes, it seemed to me advisable to present 

 the various items in the order usually followed in analyses 

 of potable waters, and following these, a complete analysis 

 of the residue. The methods adopted are first described, 

 and the results tabulated at the end of the paper. 



Total solids— Four litres of the water were evaporated 

 in a platinum dish and dried at 110° C. to constant weight. 



Chlorides— One litre of the water was concentrated and 

 the chlorine determined by titrating with standard silver 

 nitrate using potassium chromate as indicator. 



Tree and Albuminoid Ammonia— These were estimated 

 in 500 cc. of the water by Wanklyn's process. The amounts 



