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75         G®             from      (typically   solvent,   The   there   (typically   a   to   workers   are   the   20M®
               Chromosorb   41   8.3   12.5   16.8   21.3   25.8   permission   compounds,   solutes—gases   solvent.   Chromosorb   laboratory   phases   choices   like   NeNair®   Carbowax   OV-210   OV-275



          for                 with      liquid   boiling   volatile   the   (on   chemical   consequence,   catalogs   of   several   these   column   OV-1   OV-17   1994.
          percent)            Reprinted   of   high   volatile   in a   remove   phase   column.   a   list   long   end   of   nonpolar   Society,


          weight                Society.   amounts   and   or   made   is   to   the   common   As   suppliers’   the   this   To   few   A   Chemical

          (in   W®            (1973).   Chemical   small   samples   phase   stationary   into   a   phase.   restrict   phases.   a   20M®   (1975).
          Loadings   Chromosorb      9.3   17.9   25.7   32.8   39.5   45.6      818   45,   hold   efficiency   large   evaporated   liquid   easily   found   in   stationary   commercial   to   problems.   include   Phases      Yancey’      Carbowax     115   13,   (1986).   117   American



          Phase               Chem.  Anal.   American   1973,   only   for   high   for  better   stationary   and   25%   with   pack   PHASES   liquid   in   listed   is  problem   analytical   preferred   of   they  general,   Stationary   OV-101   OV-17   OV-202   OV-225   Sci.   24,   Sci.   Manual,


    Phases   Stationary       E.,   D.   Copyright   can   G®   better   are   are   of  the  solution   support,   solid   those   will   and   dry   STATIONARY   nonvolatile   a   as  possible   phases   The   most   lists   their   In   5.4.   Liquid  Recommended   Chromatogr.   J.   Chromatogr.   Training  ACS


    Stationary   Equivalent   5.3   Supports.   P®   Durbin,   from:   Chemistry,   Chromosorb   loadings   loadings   high   A   the   with   even  material,   appear   every   tested   liquid   many   them).   of   200   solve   will   published   Table   5.4   4000   =   al.,   et   S.,   J.   A.,   J.   M.,   H.




    Liquid   TABLE   Solid   Three   Chromosorb   5.0   10.0   15.0   20.0   25.0   30.0   Taken   Analytical   area.   3-5%).   ley   the   and   example.   for   mixed   final   P®)   will   LIQUID   Virtually   been   has   too   are   about   which   few   have   listed   in   TABLE   Hawkes’   OV-101   OV-17   Carbowax®   OV-210   DEGS   10C   Silar   Hawkes,   *   Yancey,   >   McNair,   °









    Inlets   Maximum   Liquid   Phase   30   15   5   7   10   listed   active   form   peaks.   acid   {1].   and   known   II,   can   more   range,   Table   the   liquid   surface   (um)

    and        %                          (Chromosorb®)   are   too   can   tailing   to   be   inert   (DMDCS)   are   Chrom   Q   supports   liquid   produce   mesh   (see   with   15%   amount   that   and   Range   28   24

    Columns   Size  Pore   (um)   0.4-2   8-9   NA   NA   NA   types   often   that   cause   needs   more   still   supports   Gas   that   these   stationary   to   screening   varies   that   twice   density



    Packed      (g/cc)  Density   Type   0.47   0.24   0.58   0.40   0.42   Celite   the   Corp.   diatomaceous  earth   the   of   major   are  supports   hydroxyl-groups   and  molecules   Chromosorb   W®)   it   make  dimethyldichlorosilane   white   W-HP®,   deactivation   is   polar   a   small  particles   according  given   for   used   100/120   mesh.   support   solid   shows   5.3   nearly   to   differences   in   (um)   To   149   125

          Supports*   Packed  (m%/g)   Diatomaceous  Earth   Polymer  Fluorocarbon      of  marks   trade   from  made   The  properties   earth  diatomaceous   contain   free   to   solute   (white   to  silanized   and   are   The  deactivated   Chromosorb   of  disadvantage   them  coating   with   narrow   of  ranges   usually   is   size   the   of   sieves   GC   or  80/100   are   the   on  coated   25%.   to   1   Table   loading  equivalen










         Representative   Solid   Surface   Area   40   1.0   0.5   750   0.7   75   exclusive   and   by   available   but  used,   those   found   best.   be   to   the   of   samples.   They   hydrogen   bonds   material  inert   AW)  (designated   silanizing  reagents   (HMDS).   Supelcoport®,   as   One   Q®.   hydrophobic,   and   3,  Chapter   Particle   the   sizes   pore   for  choices   phase  liquid   of   range   can   from   Chromosorb





         5.1        P®   W®   G®   T   Manufactured   Not   =   been   been   5.1.   surfaces   GC   most   the   typical  hexamethyldisilazane   such   Anachrom   difficult.   noted   in   columns.   by   Common   amount   and   on   on   Mesh   5.2   Range*   a  definition
         TABLE      Chromosorb   Chromosorb   Chromosorb   Chromosorb®   Chromosorb®   *   NA   Table   The   polar   undesirable   washed   names   become   As   efficient   determined   The   support   (25.7%)   80/100   100/120   For
   74           Name                     have   have   in   for   Even   Some   by   and   be   5.2).   phase   TABLE   Mesh   *
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