Monitoring of H 2 S, NH 3, Benzene, Toluene, Ethylbenzene, Xylene and Dimethylethylamine  

A new integrative cryogenic air sampler (patent application number 08/00669), able to overcome many of the limitations in current volatile organic compounds and methodologies odour sampling available from Labaqua (Spain). The sample is spontaneously collected in a universal way at 15 mL/min, selectively dried (reaching up to 95% of moisture removal) and stored under cryogenic conditions. The sample is Collected spontaneously in a universal way at 15 mL / min, selectively dried (Reaching up to 95% of moisture removal) and stored under cryogenic conditions.

The sampler performance was tested under time weighted average (TWA) conditions, sampling 100 L of air over 5 days for determination of NH 3 , H 2 S, and benzene, toluene, ethylbenzene and xylenes (BTEX) in the ppm v range. The sampler performance Was tested under time weighted average (TWA) Conditions, sampling 100 L of air over five days for determination of NH 3, H 2 S, and benzene, toluene, Ethylbenzene and xylene (BTEX) in the ppm v range. Recovery was 100% (statistically) for all compounds, with a concentration factor of 5.5. Was Recovery 100% (Statistically) for all compounds, with a concentration factor of 5.5. Furthermore, an in-field evaluation was done by monitoring the TWA inmission levels of BTEX and dimethylethylamine (ppb v range) in an urban area with the developed technology and comparing the results with those monitored with a commercial graphitised charcoal diffusive sampler. Furthermore, skilled an in-field evaluation Was done by monitoring the TWA inmission dimethylethylamine Levels of BTEX and (v ppb range) in an urban area with the Developer technology and Comparing the results with a commercial Those graphitised Monitor with diffusive charcoal sampler. The results obtained showed a good statistical agreement between the two techniques. The Obtained results show to good statistical agreement Between the two techniques.