Page 84 - Basic Gas Chromatography
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Phases   71  (GSC)  Phases  Stationary   Solid      Adsorbents   GC  Common   Some   4.6  TABLE   not   do      small   the   Names  Trade  Commercial     DB-WAX.®   Porasil®  Chromasil®,   12,  Grade  Davidson   gel   Silica   alumina  Activated  Unibeads-A®   F-1,  Alumina   lightly   a   13X   MS   5A,   MS   sieves  molecular  Zeolite   molecular  Carbon  choice  Graphpac®  Carbograph®,  Carbotrap®,  Carbopack®,   sieves   Century  Chromoso


    Stationary   they  because   accentuate   like   separation.   columns,   good   a   be   for  column   polymers   special   phase   is   column   0.25mm   I.D.   +   Courtesy   of   Contrasts,   John   Inc.  Sons,   &





           separation   polarity.   To   stationary   phase   challenging   packed  using   column   would   20M®   silicone   the   Other  used.   stationary   silicone   x  meters   film   injection   p.s.i.   12   1cm/min.   Benzene   .   Toluene   .   Ethylbenzene   .   p-Xylene   .   m-Xylene   .   o-Xylene   .   ©       DB-Wax.®   and  Concepts   John   of   Wiley




           their   in   of   this   and   OV-101   Carbowax   of   one   be   could   of   methyl   30   micron   on-column   Isothermal   @   speed:   HNO  TO   m   polar  column,   courtesy

           for   or  point   polar   a   rule   i.d.,   similar   extremes,   choice   the   15-meter   DB-WAX   0.25   yl   0.5   40°   Hy  carrier   Chart      |   min.   a   on   Chromatography:   Reproduced
           satisfactory   boiling   requires   separation   polarity   2   mm   a   and   two   as  OV-17)   5.   columns   4m)       10   isomers   M.,   48.




           be   polarity   good   general   sample   these   (such   Chapter   (0.25                        xylene   Miller,   J.   p.  1987,
          not   either   a   the   four-foot,   in   tubular   film                                         of

          will   in   in   shows   (5%),   nonpolar   Between   polarity   open   thin                  <<   Separation   From   New   York,
          phase   much   differences   4.9   Following   a   discussed   For   A                              Inc.   Inc.,

    70    ary   vary   Figure   loaded   for   sample.   mediate   are   critical.                          4.9.   Fig.   Scientific,   Sons,
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