Determination of Oxygenates and BTEX in Beverage Grade Carbon Dioxide by GC
May 12 2022
The following gas chromatography (GC) method was developed for the simultaneous analysis of ppb levels of the oxygenates acetaldehyde, dimethyl ether (DME) and benzene, toluene, ethylene and xylene (BTEX) in beverage grade carbon dioxide by installing a second column to separate acetaldehyde and DME from the carbon dioxide and the BTEX. A four port switching valve was used for column selection.
This GC method was performed on a process analyser configured with a photoionisation detector which has a detection limit for BTEX with no preconcentration at < 0.5 ppb; acetaldehyde at <50 ppb and DME at < 20 ppb. The analysis was automated via a programmable logic controller (PLC) that controls the analyser (start, calibrate, send/print report). The embedded software operating system is Windows® 10 which utilises PeakWorks, a chromatography integration system for peak identification and quantification. Data was generated that yielded the following results: <100 ppb (acetaldehyde), <50 ppb (dimethyl ether), and 5 ppb BTEX for a direct injection with no concentration of the sample. The analysis time for this multicomponent analysis was < 10 minutes. This system can be remotely operated.
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