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ANALYTICAL CHEMISTRY, VOL. 50, NO. 13, NOVEMBER 1978
Comparison of Porous Copolymers and Related Adsorbents for the Stripping of Low Molecular Weight Compounds from a Flowing Air Stream Robert Sydor and Donald J. Pietrzyk" Chemistry Department, The University of Iowa, Iowa City, Iowa 52242
Retention of low molecular weight organic compounds varying widely in polarity was determined on commercially available porous copolymers (XAD-2, XAD-4, XAD-7, Tenax GC, Porapak P, and Porapak Q), silica gel, alumina, and activated carbon. The sorbent was packed into a collection tube and air, doped with the model compound, passed through it at a known, controlled concentration and flow rate. Breakthrough was followed by a flame ionization detector (FID). The sorbent capacity was calculated from the weight change of the tube and breakthrough data. Overall capacity increased in the order Tenax GC = XAD-1 < Porapak P
