Can a bigger mesh size be used in a thermal desorption tube to reduce back pressure?
Yes, a 20/35 mesh size can be used as it does give the same results as the 60/80 mesh sorbent specified in EPA methods. It could result in less wear and tear on pumps due to lower back pressure. It seems that all EPA methods that specify a thermal desorption tube use 60/80 mesh sorbents. This smaller mesh size can exhibit high back pressures at even 200 to 300 ml/min. There are few references available on the 60/80 mesh size specifications. SKC conducted an experiment with 20/35 and 60/80 mesh Tenax TA packed in stainless steel thermal desorption tubes and with an atmosphere of toluene. Both mesh size tubes gave the same results as compared to a 226-01 charcoal tube.
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