Download Open Tubular Column Gas Chromatography in Environmental by Francis I. Onuska, Francis W. Karasek (auth.) PDF

By Francis I. Onuska, Francis W. Karasek (auth.)

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However, each stationary phase has other distinctive characteristics important to WCOT column performances. 2. Selectivity Selectivity is a term widely employed in gas chromatography, but its meaning is often not totally understood. The selectivity and efficiency of a column are used interchangeably quite frequently. Sometimes, selectivity is treated as a synonym of polarity26,27 or interpreted as the capacity to separate two substances with close boiling points. In actuality, the ability of a column to separate substances is a result of both its selectivity and efficiency.

Chromo and Chromo Comm. 1(5),263-267 (1978). K. Tesai'ik and M. Novotny, in Gas Chromatographie (H. G. ), AkademieVerlag, Berlin, 1958, pp. 575-584. F. I. Onuska and M. E. Comba,}. Chromatogr. 126, 133-145 (1976). F. I. Onuska and M. E. Comba, Chromatographia 10,498-503 (1977). G. Schomburg, R. Dielmann, H. Borwitzky, and H. Husmann,}. Chromatog. 167,337354 (1978). K. Grob, Chromatographia 8(9), 423-433 (1975). 26 12. 13. 14. 15. 16. 17. 18. 19. 20. 21. 22. 23. 24. 25. 26. 27. 28. 29. 30. CHAPTER ONE G.

The resultant surface after draining gave a sintered appearance with evenly distributed pit holes as shown in Fig. 10. This surface appears to be better deactivated than the chromic acid-sulfuric acid treated inner wall. After their drawing, fused-silica capillaries exhibit residual impurities. These impurities are concentrated on the inner wall of the capillary column due to a diffusion process and temperature gradient toward the cooler inner walls. 10. Sintered surface of HF-HNO, glass capillary.

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