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16 May / June 2019


The linearity of calibration function of the miniaturised GC has been tested in the range 0.30-50ppb for benzene using six concentrations (including the zero point). The performance characteristic complies with the performance criteria requested by EN14662-3:2015.


The pre-concentrator is made in micro- machined edged silica filled with a tailored supramolecular receptor, capable of complexing selectively with only BTEX (Figure 3). Heating the system, causes those BTEX components to be desorbed and then funnelled to the separation unit.


Figure 4: Example of several days field measurement of Benzene versus certified GC system.


The separation column is a short spiral channel with a thin cross section that was etched into a silica wafer and filled with specific stationary phase. The small form factor of the miniaturised GC-PID assists with simplification in the analysis process.


Figures 4 and 5 show chromatographic results of a field campaign over several days of continuous monitoring where we evaluated the performance against a reference instrument System. A good match is shown between the trend of the two measurements. This has also been verified in a long term field campaign lasting 3 months. In the correlation plot is important to highlight the fact that it is a comparison between two different systems, where the reference system requires an external cylinder with inert carrier gas, temperature controlled cabinet for the installation and periodic maintenance.


The other instrument (PyxisGC BTEX) does not require a carrier gas. References


adsorbed BTEX gases are then released and consequently injected into the GC column for separation.


For 15 seconds, the 2 pumps work in series and ambient air is used to wash out the pre- concentrator. After the injection, the flow is switched again into sampling mode, while the PID sensor acquires the signals of the separated components as they elute from the


column. This means that during the column elution, another sample is concentrated in the pre-concentrator. The whole cycle has a duration of 15 minutes. The area of each peak is proportional to the average concentration of the compound, as sampled during the collecting time of approximately 10 minutes. The remaining 4 minutes are used for the pre-concentrator cleaning, between successive measurement cycles.


1. INTERACTION PROFILE FOR: Benzene, Toluene, Ethylbenzene, and Xylenes (BTEX) U.S. Department of Health and Human Services Public Health Service Agency for Toxic Substances and Disease Registry) (https://www.atsdr.cdc.gov/ interactionprofiles/ip-btex/ip05.pdf -


A possible application would be the installation of the miniaturised GC-PID onboard ships and platforms: it can effectively monitor the air quality in the surrounding area. A network of several miniaturised GC-PID can be also installed along the perimeter of refineries in order to monitor the boundary compensating false results affected by the wind. Results data can be viewed through Guardian Cloud software. It is easily accessed via browser on your phone, tablet or PC. Pollution Guardian stores up and archives analysis data automatically, it allows the real time data and the historical data viewing (with creation of charts, tables, graphs and other statistical analyses). Pollution Guardian allows to set user-defined alarms on the data collected and to send notifications via SMS or email, if there is alarms of VOCs leakages or spillages to activate the procedures for remediation. In addition, push notifications on your smartphone are also available, thanks to the dedicated APP. Thanks to the Cloud it is possible to manage the instrument and the data: the remotely diagnostic has never been so simple.


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