10th August 2016
Thermal Desorption Sampling - Volatile Compound Analysis with GC
Thermal Desorption Sampling (TDS) is a method that can be used in two distinct ways.
Direct thermal desorption can be used to heat samples in order to release compounds from substances such as polymers, waxes, powders, pharmaceutical formulations, solid foods, and cosmetics. This technique can also be used for samples that contain volatile constituents that are chemically unstable, or do not react well to the typical liquid phase evaporation used with most GC samples.
The most common use of thermal desorption is as a method of pre-concentration of volatile compounds through adsorption of volatiles onto a desorption tube which are subsequently thermally desorbed in a TDS sampler before being transferred to a GC. This form of TDS sampling is employed in a number of industries such as environmental monitoring, vehicle internal air quality, construction material emissions, and odour profiling in perfumes. TDS samplers are usually coupled to a GC-MS or GC-FID to allow separation and analysis of trapped volatile compounds.
When it comes to most forms of TDS sampling, Peak’s Precision series of nitrogen, hydrogen and zero air generators can provide gas supply for both carrier and dectector gas which is easy to use and has lab efficiency at the heart of its design. Combine generators in a single stack to provide the best gas solution for your analysis, be it hydrogen, nitrogen or zero air.
Precision has been created as a flexible laboratory solution which uses limited space in the lab. Depending on the combination of gases required, Peak’s Precision series can provide improved efficiency to labs that are currently reliant upon a helium cylinder carrier gas supply. As well as alternative carrier gases, detectors can also be supplied by Precision generators.