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  1. Chromservis
  2. Chromatography
  3. Hints and tips
  4. Thermal desorption
  5. Sorbent selection
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Chromatography

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          Sorbent selection

          Sorbent tubesSelection of the correct sorbent or series of sorbents for sampling and release of the analytes of interest is one of the most important factors when developing a valid and robust thermal desorption method. Tube conditioning and capping are also critical issues. This site includes summary information on some of the most commonly used sorbents.

          Sorbent list

          Sorbent Mesh size
          Carbotrap C 20/40
          Carbopack C 60/80
          Carbograph 2TD 20/40, 40/60, 60/80
          Tenax TA 20/35, 35/60, 60/80
          Tenax GR 20/35, 35/60, 60/80
          Carbotrap™ 20/40
          Carbopack B 60/80
          Carbograph 1TD 20/40, 40/60, 60/80
          Carbopack X™ 40/60, 60/80
          Carbotrap X™ 20/40
          Porapak N 50/80
          Chromosorb 102™ 60/80
          Porapak Q wide range
          Carbograph 5TD 20/40, 40/60, 60/80
          Chromosorb 106™ 60/80
          HayeSep D™ 60/80
          UniCarb™ 60/80
          Spherocarb™ 60/80
          Carbosieve SIII™ 60/80
          Carboxen 1000™ 60/80
          Molecular Sieve 5A
          Molecular Sieve 13X

          Note: sorbent tubes should typically be conditioned using higher temperatures and faster gas flows than those selected for analysis, provided this does not mean exceeding the temperature limit of the material used.