A double plasma gas chromatography injector and detector.
A direct-current, chip-based plasma has been used for gas sample injection in gas chromatography. A second identical plasma chip has been used as the excitation source for an optical emission detector. The first plasma is normally continually sustained during operation, causing continuous ionisation/fragmentation of the sample, whilst the second plasma records the optical emission downstream. For injection, the first plasma is briefly interrupted, introducing a "plug" of unmodified sample into the system. Injection plug sizes of between 5 and 50 [micro sign]l have been reproducibly obtained, although significantly smaller volumes may be possible with the use of smaller cross-section columns, lower flow rates and/or shorter plasma interruption times.
Imperial College London, Department of Chemistry, London, UK.
Omar P
OP
Naji
Andreas
A
Manz
D055598:Chemical Phenomena; D002627:Chemistry, Physical; D002725:Chloroform / Q000032:analysis; D002849:Chromatography, Gas / Q000295:instrumentation* / Q000379:methods; D004867:Equipment Design; D006371:Helium / Q000737:chemistry; D007477:Ions; D008752:Methylene Chloride / Q000032:analysis; D012680:Sensitivity and Specificity; D013997:Time Factors
D007477:Ions; D006371:Helium; D008752:Methylene Chloride; D002725:Chloroform