﻿138 
  

  

  Browning 
  — 
  Estimation 
  of 
  Thallium. 
  

  

  should 
  be 
  formed. 
  In 
  several 
  experiments 
  this 
  salt 
  was 
  dis- 
  

   solved 
  in 
  water 
  and 
  the 
  sulphuric 
  acid 
  present 
  in 
  combination 
  

   precipitated 
  by 
  barium 
  nitrate. 
  The 
  results 
  obtained 
  agreed 
  

   closely 
  with 
  the 
  formula 
  of 
  the 
  acid 
  sulphate 
  of 
  thallium. 
  

   Having 
  obtained 
  by 
  the 
  method 
  described 
  the 
  acid 
  sulphate, 
  

   the 
  crucibles 
  were 
  removed 
  and 
  heated 
  carefully 
  over 
  a 
  free 
  

   flame 
  to 
  low 
  redness, 
  when, 
  after 
  a 
  considerable 
  evolution 
  of 
  

   sulphuric 
  acid 
  fumes, 
  the 
  weight 
  again 
  became 
  constant, 
  and 
  

   the 
  results 
  showed 
  a 
  condition 
  closely 
  approximating 
  to 
  that 
  of 
  

   the 
  neutral 
  sulphate. 
  In 
  several 
  of 
  these 
  experiments 
  the 
  

   sulphuric 
  acid 
  present 
  in 
  combination 
  was 
  determined 
  and 
  

   showed 
  amounts 
  closely 
  agreeing 
  with 
  the 
  constitution 
  of 
  the 
  

   neutral 
  sulphate. 
  

  

  

  T1HS0 
  4 
  

  

  TIHSCU 
  

  

  

  T1 
  2 
  S0 
  4 
  . 
  

  

  T1 
  2 
  S0 
  4 
  

  

  

  

  calculated. 
  

  

  found. 
  

  

  Error. 
  

  

  calculated. 
  

  

  found. 
  

  

  Error. 
  

  

  

  grm. 
  

  

  grm. 
  

  

  grm. 
  

  

  grm. 
  

  

  grm. 
  

  

  grm. 
  

  

  1 
  

  

  04605 
  

  

  0-1596 
  

  

  0-0009- 
  

  

  0-1344 
  

  

  0-1346 
  

  

  0-0002 
  + 
  

  

  2 
  

  

  0-1611 
  

  

  0-1608 
  

  

  0-0003- 
  

  

  0-1349 
  

  

  0-1346 
  

  

  0-0003 
  — 
  

  

  3 
  

  

  0-1608 
  

  

  0-1808 
  

  

  o-oooo 
  ± 
  

  

  0-1347 
  

  

  0-1352 
  

  

  0*0005 
  -f- 
  

  

  4 
  

  

  0-1612 
  

  

  01600 
  

  

  0*0012 
  — 
  

  

  0-1350 
  

  

  0-1346 
  

  

  0-0004 
  — 
  

  

  5 
  

  

  0-1602 
  

  

  0-1596 
  

  

  0-0006 
  — 
  

  

  0-1341 
  

  

  0-1346 
  

  

  0-0005 
  -f 
  

  

  6 
  

  

  0-1608 
  

  

  0-1596 
  

  

  0-0012 
  — 
  

  

  

  

  

  7 
  

  

  0-1617 
  

  

  0-1604 
  

  

  0-0013 
  — 
  

  

  

  

  

  8 
  

  

  0*1608 
  

  

  0-1592 
  

  

  0-0016 
  — 
  

  

  0-1347 
  

  

  0-1358 
  

  

  0-0011 
  + 
  

  

  9 
  

  

  0*1609 
  

  

  0-1590 
  

  

  0-0019 
  — 
  

  

  0-1348 
  

  

  0-1346 
  

  

  0-0002 
  — 
  

  

  These 
  results 
  would 
  seem 
  to 
  show 
  that 
  thallium 
  may 
  be 
  

   estimated 
  either 
  as 
  the 
  acid 
  sulphate 
  or 
  as 
  the 
  neutral 
  sulphate 
  

   by 
  careful 
  attention 
  to 
  the 
  proper 
  conditions 
  of 
  temperature. 
  

  

  