D.08

Lowering detection limits for gas analysis in GC by using most selective stationary phases and conversion of CO and CO2 to methane using a new methanizer to enhance detector sensitivity

Jaap de Zeeuw, Restek (NL)

The analysis of trace amount of gases is a challenge as one needs to use GC columns that generate sufficient retention for gases and elute the traces with good peak shape. This is not possible using gas liquid chromatography. Gas solid mechanisms allow separation of gases at temperatures above ambient which are easy to control.Still detection of gases is a challenge as TCD cannot “see” gases below 20ppm. One can use more sensitive detection systems like the PDD discharge, SCD, ECD or even MS detectors, but these detectors require experience and need specific procedures to operate. For CO and CO2 often ppm range levels have to be quantified and for these components a simple solution has been proposed: after elution from the GC column, convert the CO and CO2 peak into methane uaing  Nickel catalyst under H2 and detect with FID. This way it is possible to detect low ppm/ppb levels of CO as the FID is very sensitive for hydrocarbon type analytes.A new methanizer has been developed that is very sensitive, linear and easy to  and operates with a very easy way to replace Ni-catalysts cells.In this presentation we will zoom into the columns for gas analysis and the application and limitation of this new methanizer system.

 

Pen Profile

For CO and CO2 often ppm range levels have to be quantified and for these components a simple solution has been proposed: after elution from the GC column, convert the CO and CO2 peak into methane using Nickel catalyst under
H2 and detect with FID. A new methanizer has been developed that is very sensitive, linear and easy to and operates with a very easy way to replace Ni-catalysts cells Jaap studied 6 years of chemistry and graduated in 1979;
His thesis was entitled “Fused Silica Capillary Column Technology”; Jaap has 38 year experience in GC capillary technology, developed many PLOT columns as well as bonded phase columns. He is also the originator for simple concepts for fast GC/MS using a high vacuum inside the capillary column for which several patents were granted. He also made the world longest fused silica capillary for which a Guinness book of Records listing was granted. Jaap has traveled widely and is well known for his technical expertise and teaching skills. Jaap has published more then 100 publications in the field of GC on column technology and application. In 1996 Jaap co-authored a book on adsorption chromatography with Victor Berezkin. Jaap worked 27 years for Chrompack/Varian during which time he developed Dow as a major beta test site for new GC technology. Presently Jaap serves the last 10 years as an international specialist on gas chromatography for Restek in the Netherlands, involved with product development, application, teaching and marketing

 

+31 (0)15 2 690 147