Am.  Jour.  Pharm. 
April,  1903. 
}      Modification  of  Nesslers  Tube. 
167 
The  process  for  determining  ammonia  may  here  be  described  tor 
the  benefit  of  those  having  a  limited,  or  no  use  for  the  jar.  The 
Wanklyn's  method  employs  200  c.c.  of  ammonia  free  water  with 
about  10  c.c.  of  saturated  sodium  carbonate  solution  to  clean  the 
apparatus.  After  two  50  c.c.  jars  have  passed  through  the  condenser, 
500  c.c.  of  the  suspected  water  is  added  to  the  remaining  100  c.c, 
plus  the  sodium  carbonate  solution  in  the  flask.  Three  50  c.c.  tubes, 
containing  the  free  ammonia,  are  collected,  and  then  the  50  c.c.  of 
the  alkaline  potassium-permanganate  solution  (200  grammes  of 
potassium  hydrate  and  8  grammes  potassium  permanganate  to  the 
I — I  A\ 
50  c*.  1 
Modified  Nessler's  Tube. 
litre)  is  added  to  the  flask  and  the  distillation  continued  until 
three  tubes  of  the  albuminoid  ammonia  are  collected,  and  then  the 
entire  six  are  nesslerized.  Two  c.c.  ol  Nessler's  reagent  is  also  added 
to  the  standard  tubes  containing  *oi  milligramme,  02  milligramme 
and  higher  strengths  of  the  ammonia.  The  strength  of  the  different 
tubes  is  calculated  in  parts  per  million. 
