Sample preparation
Sample preparation - contextSample preparation - motivationPurpose of sample preparationOverview of preparation methods
Liquid liquid extraction (LLE) Solid phase extraction (SPE) Solid phase microextraction (SPME) Purge and trap (PT) (Accelerated) Solvent extraction ((A)SE) 
Supercritical fluid extraction (SFE) Filter Techniques (FT)
Box 10 FiltrationBox 11 SorbentsBox 12 Preconcentration
SelftestProblems 1) Adsorbents Answer 2) Purge and trap Help Answer 3) Solvents for liquid extraction 4) Concept map 5) Cargo screening Answer
End of chapter5) Screening air cargo for explosives
Problem:
At airports huge amounts of air cargo have to be screened for explosives every day. The cargo typically comes in closed containers or on palettes completely wrapped in adhesive foil. One method for cargo screening used for example in France, the UK and the Netherlands is to suck air from the inside of the palettes or the containers through a filter and then present these filters to dogs that are trained to alert on explosives.
How would one find the optimal filter for this procedure? Is it possible to present the animals sniffing at the filters with an odour concentration similar to or even higher than the original gas phase concentration inside the container / palette?
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