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By Jiří àevĉík (Eds.)

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Additional resources for Detectors In Gas Chromatography

Example text

These values are obtained using hydrogen as the carrier gas and only a narrow range of molecular masses is covered. When the values are compared with those given in the literature 45 [25, 341, substantial differences are found. The validity of the published relative response rates must be judged carefully, as data concerning the measuring cell geometry and the experimental conditions are sometimes not specified. RMR values differing by as much as 18% between flow-through and semi-diffusion cells have been found [40].

A practical requirement for a selective detector is that I' 2 10. 6 LITERATURE 1. : Anal. Chem. 41, 1446 (1969) 2. Arutyunov Yu. , Zibrova L. , Karpov E. , Karbanov E. , Kravchenko V. , Korlyakov G. : Zavod. Lab. 38, 660 (1972) 3. Ballinger P. , Whittemore I. : Gas Chrornatogr. Abstr. 1971, 1040 4. : Ingenieurs 1970, 5 5. Bevan S. : J. Chromatogr. 11, 301 (1963) 6. Bowman M. : J. Chromatogr. Sci 7, 484 (1969) 7. Brazhnikov V. , Sakodynskii K. : Gazov. Khromatogr. 1969, 5 8. Burchfield H. , Wheeler R.

Alloys of platinum with iridium or rhodium have better mechanical properties but yield smaller signals then platinum sensors. After platinum, tungsten is the most commonly used filament material. 006 mm) can be used. However, it is oxidizeh by atmospheric oxygen at temperatures above 500 "C. Nickel filaments are occasionally used in corrosive media, but their use is limited by their poor mechanical properties [8, 9, 13, 15, 36, 441. A number of workers have tried to prolong the life-time of sensors, decrease the noise level and prevent drift of the background current.

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