Markes International’s Centri, a fully automated multi-mode sampling and concentration platform for GCMS, uses robotics to reliably automate sampling and pre-concentration of volatile and semi-volatile organic compounds (VOCs and SVOCs) through the following sample introduction modes—HiSorb high-capacity sorptive extraction, headspace, headspace-trap, SPME, SPME-trap and thermal desorption.
Analyte flows from all modes can then be concentrated on a sorbent-packed cryogen-free focusing trap. A principal feature of the platform is that it automates the entire process of sampling, pre-concentration and GC injection for solids, liquids and vapors—this allows major productivity improvements to be made. Another popular feature is the ability to automate high-capacity sorptive extraction from liquids and solids using the HiSorb probes. By using a relatively large volume of PDMS sorbent fixed on a robust and inert metal probe, HiSorb simultaneously allows high sensitivity and robustness to matrix interferences. The GCMS platform can also automate sampling using a number of well-established and widely used techniques, enabling the analyst to select the best method for their sample. In addition, it can desorb industry standard thermal desorption tubes in compliance with standard methods. These tubes can either be packed with sorbents and used in conjunction with pumped, diffusive or dynamic-headspace sampling, or used to contain small samples of materials and foods, which are then desorbed directly.