NOTES ON GOULBUKN WATER. 



395 



•02 parts per 100,000 

 1*35 

 4*25 



•144 



•192 



Nitrogen as nitrites 



Sulphur trioxide (S0 3 )... 



Magnesium oxide (MgO) 



Oxygen absorbed in L5 minutes 



Oxygen absorbed in 4 hours ... 

 The solid residue before ignition had a strong organic odour 

 and a brownish colour. 



Since the organic and free ammonia appears excessive in 

 this analysis a sample from another bottle was tested, with 

 the following results : — 



Organic ammonia ... '014 parts pet* 100,000 



Free ammonia "023 ,, ,, 



Total *067 



Experiments with Clarifying Agents.— Experiments were 

 next tried with clarifying agents : lime, alumi no-ferric 

 (commercial aluminium sulphate) and ferrous sulphate, to 

 test the effect on the ammonia and on the hardness. As 

 the water had been standing for a month since the last 

 determination of amm onia this was redetermined; the organic 

 ammonia had decreased and the free ammonia increased, 

 the total being very nearly the same. These figures are 

 given in Table I. 600 cc. of the water were taken in each 

 case, the clarifying agent added, allowed to stand one night, 

 then filtered and analysed. 



Table I. 





Ammonia. 



Hardness. 



Substance added. 



Organic 



Free. 



Total. 



Tempry. 



Permnt, 



Total 





Before 



After 



Before 



032 



After 



027 



Before 



071 



After 



039 



Before 



8 



After 



65 



Before 



7-5 



After 



6-5 



Before 



155 



After 



Ex. I. 0087 grin. CaO 



•039 



•012 



13-0 



II. 0101 „ AlFe 



>> 



•018 



,, 



•034 



S) 



052 



>) 



6 



,, 



6-5 



»j 



125 



III. 101 „ AlFe 



>t 



007 



,, 



044 



,, 



051 



,, 



3 



„ 



105 



3) 



13-5 



IV. -02 „ FeSO, 



•. 



01 



»» 



•044 



„ 



054 



a 



7 



„ 



11 



)) 



180 



In all cases there was a considerable reduction in the 

 amount of organic ammonia and an increase in the amount 



