Thermal release, organic materials

Notes The most commonly used porous polymer sorbent is Tenax-GC, although the Porapakand Chromosorb Century series have also been used Tenax-GC has been used with thermal desorption methods, but can release toluene, benzene, and trichloroethylene residues at higher temperatures in addition to Tenax-GC, XAD 2-8, Porapak-N, and Chromosorbs 101, 102, 103, and 106 have found applications, sometimes in stacked sampling devices (for example, a sorbent column of Tenax-GC — Chromosorb 106 in tandem) Chromosorb 106, a very low polarity polymer, has the lowest retention of water with respect to organic materials and is well suited for use as a backup sorbent... 

The large amount of energy released in charged-particle bombardment tends to exclude this method where thermally labile organic or biological materials are employed as targets. However, Odeblad (54) was able to determine sodium in urine and other elements in biological materials by means of the weak source of alpha particles (160 millicuries) derived from the decay of Po . A similar source of alpha particles has been used to determine aluminum by the reaction AP (a,n)P —half-life 2.5 min (66). 

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