In the previous study, a CDS Analytical 7000C concentrator with an optional DHS module was used to perform fragrance profiling study. An average RSD = 2.8% (n=8) was observed from 26 fragrance compounds. Interestingly, the result was showing that the response factor from the DHS module is two times higher than the direct GC injection method. This application paper is a continuous study after the previous work. The experimental design focused solely on obtaining calibration curves from the same 26 fragrance compounds to show the system is qualified for quantification studies.
As previously described, the same GC sample introduction hardware was deployed as a CDS 7000C concentrator configured with a DHS module. On the automation side, the setup was connected to a CTC RTC rail. This automated system is controlled by Pal Sample Control (PSC) software with two plug-ins for the 7000C concentrator and the DHS module individually.
The DHS module was mounted on the RTC rack. A perfume sample was sealed in a 10 ml VOC vial and placed on the sample tray. During testing, the VOC vial is transported by the CTC Purge and Trap Tool, which is the robotic arm designed specifically to handle 10 ml, 20 ml and 40 ml VOC vials for purge and trap applications, into the DHS module. Once the sample was loaded into the DHS module, the dual jacketed needle inside the DHS module was lowered to pierce the top septum of the vial. Inlet purge gas flow followed to purge the sample in the headspace through a heated transfer line to be enriched in the analytical trap installed in the 7000C concentrator.
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