Patent Application Publication  Jan. 23, 2014 Sheet 19 of 22  US 2014/0021404 Al  FIG. 19  - C  (1)  C:  0  (,)  C  0  Q)  - (U  C:  0  .0  ’› (U  (.)  60  40  ................. :j  2.0  3,0  Amount of HCI04 added  (  _f) 