Page 164 - Basic Gas Chromatography
P. 164

Temperature   151   Topics  Special   be  gradual  Analysis  Quantitative   on  the   PTGC   of   effect   the   show  clearly  chapter   this   in  presented   data   The   column   the   in   conclude   to   one   lead  peaks.  This might  individual   the   of   shape   and   size   moved   it   in   case.   the   not   is  analysis. This  quantitative   for   used   be  cannot  PTGC   that   and   that,   synthetic   a   of  analysis   the


   Programmed   programming  would   moved  through   x  distance   the   is   degrees   30   before   which   2,   must   analyte  traveled   3/4   the   of   of   inlet  column,   the   doubled   for   every   follows:   as   its   and  components   the  analytes   elute.   they   It   and  PTGC   in   the  about   same   is   often   one  PTGC,   might   best   use.   to   one   temperature,   that  found   which   at   the   example,   solute








         temperature   model.   our   the  analyte   then  one-half   the   in   x   approaches   the  Hence,   through  30°C,   at   the   migration   envisioned   be   column,   cool   increases,   until  rates   is  not  critical   widths—they   spend   the  column.   isothermal  operation   done   is   by   be  would   the   significant   the   has   he  value,   45   —  T’=T;   temperature   the   Thus,   run.   for   run  would   are   the





         the   by   distance   one-quarter   fractions   L).   =   the   last   “frozen”   of   rate   can   the   temperature   increasing   technique   down   screening   temperature   30-degree   temperature,   PTGC   PTGC   a   variables   general,   often   columns,   and   study   by   was   related
         since   assumed   the   increment,   degrees,   these   (2x   in   was   its   PTGC   end   of   the   at   peak   reasons,   temperature   the   the   on   In   lower   is   adequate   OT   2.5°C/min)   8°C/min   30°C/min)   topics
         figure)   as   as   30   of   column   column   solute   the   migrate,   temperature.   of   the   as   column   injection   same   partitioning   of   initial   isothermal   on   final   in   of  225°C   important   length.   (and   rate   get   for   Another   that   (up   to   some


         the   stepwise,   taken   30-degree   sum   of   the   the   to   operation   onto   there;   the   the   the   variety   If  an   isothermal   based   the   eluted   other   column   column   to   (around   [7].   TOPICS
         in   not   x   is   last   previous   The   L   half   of   Initially   began   in   down   that   about   actively   this   is   7;   temperature   programming   enough   However,   rates   found   faster   section   discussed.

  150    shown   and   If   the   the   so   on.   length   last   etc.   increase   The   injected   condensed   move   reasons   have   time   For a   workplace.   which   called   reasoning   where   interest   180°C.   Three   the   short   preferable   mixture   or   SPECIAL   this   briefly
                             it
                                                 _                   of   a   at   and   a   The   slow   min.   slow   min)   In
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