[Q] cold trap

[Gerald L. Hurst]

In article <rose.486.3056EFC4 at alf1.ngate.uni-regensburg.de>, 
rose at alf1.ngate.uni-regensburg.de (Andreas Rose        t3077) says:
>
>I study the host-finding of a blood-sucking bug (Reduviidae - 
Triatominae). 
>I want to collect odors from the headspace of a sleeping person and see 
>whether these are attractive in a behavioral test. 
>
>For the collection of the odors, I want to construct a cold trap. 

[Snip]

A dry ice-acetone trap should do the job. I would not use liquid
nitrogen because it is cold enough to condense a trap full of
liquid oxygen and solid CO2.

Jerry