A COMPLETE ANALYSIS OF SYDNEY WATER. 



155 



Total gaaes o (sample taken J ^.^ ^ ±S . QS cc 



Free oxygen (Winkler's ( Qvt1 Q 0.407 



method) f d41d " d40/ " 



Free oxygen (Thresh's ( o< 4 o 0.^0 



method) / do4y " d&& ^" 



Free carbonic acid 1*57 ,, 1*57 ,, 



Nitrogen by difference 



Analysis of Total Solids. 



18*76 cc. 

 3*41 „ 



3*55 „ 



1*57 „ 

 13*71 „ 



3 Mean 



0*2565 

 0*33425 

 0*0320 

 0*0050 

 0*07775 

 0*0085 



1*7433 1*7429 

 0*1023 

 0*720 



0*6464 0*6466 

 3*025 

 traces 

 nil 



0*1075 

 0*0054 

 0*0460 



Total ions 7*1097 



The knowledge obtained from a statement of the total 

 amounts of the ions present in the salts not being sufficient 

 to show how they are combined together, an attempt was 

 made to obtain some information of this character by a 

 treatment of the dried residue with alcohol. In carrying 

 out this treatment four litres of water were evaporated to 

 dryness on a water bath in a platinum dish, the residue 

 repeatedly extracted with cold 40°/° alcohol, and the ions in 

 both the soluble and insoluble portions estimated. 



It was found that 64*12°/> of the S0 4 together with all 

 the calcium, iron, aluminium, zinc, manganese, phosphoric 

 acid, and 26*93°/° of the magnesium remained in the insoluble 



Ca .., 

 Mg ... 

 Zn ... 

 Mn .., 

 Fe .., 

 Al .. 

 Na ... 

 K .., 

 C0 3 .. 

 S0 4 ... 

 CI .. 

 Br .. 

 N0 2 .. 

 N0 3 .. 

 P0 4 ... 

 Si ... 



1 



2 



0*259 



0*254 



0*336 



0*3325 



0*0327 



0*0313 



0*0050 



0*0050 



0*0733 



0*0822 



0*008 



0*009 



1*7444 



1*7411 



0*1023 



... 



0*720 



0*720 



0*6458 



0*6478 



3*025 



3*025 



traces 



traces 



nil 



nil 



0*106 



0*109 



0*0054 



0*0054 



0*0460 



0*0460 



