Abstract
The performance of an automated system developed for environmental trace analysis to collect, preconcentrate and analyse organic atmospheric pollutants present in the ppb and ppt range was evaluated by taking into account the use of several detectors for identification. Organic compounds present in air, directly taken from the atmosphere or carried to the laboratory in passivated canisters or bags, were sampled with a large volume loop, concentrated in a trap filled with different types of adsorbents, thermally desorbed and stripped by a stream of pure gas and analysed with capillary columns of different length, diameter and polarity. A programmed temperature vaporization injector (PTV) was also used for refocusing of the sample before analysis. Flame ionization and photoionization detectors were used for the determination of aromatic and aliphatic compounds. The sensitivity and stability of the system were checked. Some examples of application to the analysis of different samples at various concentrations are described.
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