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Stronger adsorbents are allowed for very volatile compounds, but will yield only partial desorption of heavier compounds.
It is advisable to reduce sampling time if the estimated overall VOCs concentration is higher than 2,000 µg·m The cartridges have undergone a complex conditioning procedure that ensures an outstanding chromatographic blank level.
If kept in a cool place without VOCs contamination, blank level and adsorbing capacity stay unalterated for at least eighteen months.
Expiry date and lot number are printed onto the cartridge plastic bag: its integrity stands as warranty seal.
Thermal desorption is an easy-to-use technique, but it implies some precautions and is of less general use than chemical desorption.
The recovery of adsorbed compounds is based onto the different shape of adsorption isotherms at different temperatures.