Page 30 - Basic Gas Chromatography
P. 30

Overview   17  Measurement   and  Control  Flow      MEASUREMENT   AND  CONTROL  FLOW   While   is  helium   control   and  measurement   The  column   both   for  essential   is   flow   gas  of  carrier   fire   for   the   on  depends  efficiency  Column  analysis.  qualitative   for   and  efficiency   he-   or   proper   the  changing   by  determined   easily   be   can   which  velocity   gas   linear   slower   a   is  number  plate



      Instrument   popular.   most   (where   potential   the   nitrogen   either   but  sensitivity,   dry,   very   is   because   phase   liquid   polyamide   desorb   also   background   cause   a   their   high   prices   (water   adequate   of   Purity   by  removed   the   and   readily   be   sieve.   be  should   nitrogen.   filter,  special   from  Oxisorb




               the   world   of   detector,   methane   purity   the   can   gas   limit   purchase   and   PRICES   liters   gas   High   can   molecular   dry   of   the   into   a
               is   the   because   detector,   more   attack   and   water   detector   carrier   thus   to   is   purity   49   carrier   the   easily   cylinder   they   5A   sieve   flow   requires   Rhein,
               helium   parts   of   slightly   capture   5%   with   high   of   polyglycol   of   high   the   and   gas   the   AND   Purity   99.9999%   99.999%   99.995%   the   laboratories.   purchase   be   can   gas   the   or   grade   the  used,   slow   easily   fit   and   am


               detector,   some   in   recommended   ionization  flame   provides   electron   argon   of   be   gas   chemically   can   Polyester,   amounts   a  produce   in  hydrocarbons   detectors   carrier  purity   compares   SPECIFICATIONS      containing   purchasing   most   for   to   is   hydrocarbons   between   available,   GC   with   been   have   with   a   to   coiled   regeneration.   remove   Ludwigshaven   Alltech.



               conductivity   used  commonly   not   is   it   the   With   Nitrogen   the   For   mixture   a   the   that  carrier   water   and   it.   Trace  susceptible.   and   Trace   ionization   high  obtain   list  following   States:  United   HELIUM   cylinder   a   for   Obviously,   feasible   common  practice   trace   filter   sieve   commercially   column   1/4”   cylinders   hours   3   for   be   can  column   easy   to  difficul





               thermal   is   expensive),   explosions.   used.   be   helium.   than   or  nitrogen,   important   oxygen   destroy   and   contaminants   peaks.’   most   with   to   way   The   the   in   grade   quoted   psi.   2400   economically   more   and  Water   molecular   are  tubes   by   6-ft.   gas   two   300°C   to   6-ft.   for   oven   more   is   from  catalyst   Purifier   Gas


               the   hydrogen   may   analysis   as   particularly   One   cylinders.   available   Quality   Research   Ultrapure   purity   are   at   The   it.   a   after   heating   the   Oxygen   Dow

      16       For   very   and   lium   free   Purity   is   It   such   column   column   “ghost   ground   High   Prices   rated   not   is   purify   SA   a   Drying   filling   case,   by   made,   column   BTS   a   or
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