Thermionic detectors in gas chromatography

The Nitrogen Detector in Gas Chromatography

“…A number of variations of their original device have been described, which are extensively reviewed by Brazhnikov et al 2 The most distinctive difference between the detectors described is in the use of either a single flame, as in the original device, or the use of two flames, as reported by Karmen 3 and later improved by Abel et al 4 Of these devices, only the single flame detectors have been successfully applied to the determination of nitrogen compounds.…”

“…Response and selectivity are also dependent upon the wave length chosen for viewing, which is not necessarily the same for all compounds that contain a given element." 2 Those interested in other aspects of the microwave emission detector should consult papers by Talmi," 3 Talmi and Mesmer," 4 Kustom and Fuja," 5 Talmi and Andren," 6 Serravallo and Risby," 7 123 Considerable information is given in these papers on detector design, determination of atomic ratios, and determination of organometallics.…”

“…When the electrical gradient is reversed (the ' source at a positive potential with respect to the collector), the background increases ( by a factor 1000, 35 which is in the range of background currents observed for the | AFID. 2 However, operation of the detector in this mode is precluded, since the quantity of alkali is very small and consequently rapidly depleted.…”

“…For some detector designs, the hydrogen flow must be regulated with exceptional accuracy. 2 The flame temperature is also influenced by the flow rates of the carrier gas and air. In actual practice, it is difficult to maintain gas flows within the required tolerances for stable operation at high detector sensitivities.…”

Argon detector: alternative detection system for gas-liquid chromatographic analysis of short-chain organic acids

“…The argon detector, which requires a single inert gas (argon), is sensitive to picogram concentrations of nearly all organic compounds (1,4,7,8). Its linear range is somewhat limited when compared with TC and FI systems, and sensitivity may be drastically reduced by contamination with air of water vapor (1,7). Careful attention to sample preparation techniques, however, can make the argon detector a convenient and practical tool for anaerobic bacteriology.…”