Fast chromatographic methods need only a few minutes comparable with the response time of many chemical sensors. Combined with a specific detector they may well surpass the sensors.
Karl,
I think this is mostly a question of your field of application.
pro electronic: can measure concentration constantly, only one part which can be faulty :-)))
con electronic: t90 response times make signal analysis complicated (but it is possible to calculate true concentration from signal increase!), possible cross sensitivities
pro flash/micro gc: more versatile, more components simultaneously, calibration is easier
con flash gc: more possible sources of troubles (injector, colomn, detector etc), infrastructure necessary (e.g. high purified carrier gases etc)
Just my 2cents
Stefan
Electronic noses need a closed system with no new or unknown compound not trained in the very sophisticated training phase (permutation of constituents and concentrations = thousends of calibrants of e.g. only 10 constituents).
Flash GC with an element-selective detector needs only one calibrant with the elements of the compound looked for in the sample.
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