Table 5 Overview of sampling methods and derivatisation agents used by these sampling methods. This table summarizes the sampling method and derivatisation agent as well as the advantages and disadvantages of respective sampling method
Sampling method | Derivatisation agent | Advantages | Disadvantages |
|---|---|---|---|
Impinger | Nitro reagent MAMA 1-2PP 2-MP Tryptamine DBA MAP Acid Alkaline ethanol | Simple set-up Large sampling capacity | Smaller particles and gas phase molecules could be drawn out from the impinger flask Poor collection efficiency of particles (range 0.01-1.5 μm) |
Impinger-filter | DBA 2-MP MAP | No pre-impregnation of filter (DBA) High reagent concentrations can be used Collection of particles (range 0.01-1.5 μm) | Limited sampling time due to evaporation of the solvent Not convenient for exposure measurements on workers |
Diffusive sampling (incl. ISO-CHEK) | 2-MP DBA | Â | Difficulty of discriminating between particles and droplets Sensitive to wind, humidity and temperature fluctuations |
Impregnated filter/solid sorbent samplers | MAMA 1-2MP 2-PP Tryptamine DBA | High capacity (compared to exposure levels) User-friendly handling | Limited amount of reagent can be used Risk of particle depletion |
Annular denuder system | DBA | Higher sampling capacity and efficiency for the vapour phase compared to the cylindrical type | Simultaneous sampling of gaseous and aerosol concentrations |