Torion Technologies Inc. introduces the new CUSTODION®-ADS, a simple device for sampling solid surfaces. Solid surfaces that have been exposed to toxic or harmful chemicals may demonstrate persistent background levels of contamination.
Recovery of chemical contaminants from solid or fixed surfaces for analysis can be challenging, particularly if it is not possible to collect a solid sample to take to the laboratory. The CUSTODION-ADS is a simple device designed to collect volatile and semivolatile organic compounds from fixed surfaces for easy transfer to instrumentation such as a GC or GC-MS.
The CUSTODION-ADS operates much like a large syringe with the barrel placed and sealed directly on a solid surface, and a plunger that is retracted to generate a modest vacuum over the solid surface. The ADS creates an enclosed volume that has a reduced pressure, which speeds the process of compounds diffusing from the solid surface into the gas phase of ADS chamber. Once in the gas phase, the chemicals are collected using a solid phase microextraction (SPME) fiber. This method is so effective that small amounts (1 μL) of chemical can still be detected on a surface 3 weeks after exposure to an open environment.
Sample collection on a SPME fiber is quick, easy and reliable with Torion’s novel CUSTODION® SPME syringes. The CUSTODION SPME Syringe needle can be easily inserted into the vacuum chamber of the ADS by puncturing the septum-like seal of the chamber. The SPME fiber is exposed to the vapor phase analytes for ~15 seconds or more to collect the analytes. The chemicals are then injected into GC or GC-MS system to complete analysis and identification.
The CUSTODION-ADS delivers a consistent vacuum over multiple uses, which make solid surface sampling reproducible, quantitative, safe, and easy. Since analyte extraction is performed on-site this allows portable GC-MS systems, such as the TRIDION™-9 GC-TMS to be employed for on-site analysis and identification of the contaminants.