2. The Thermal Conductivity Detector (TCD) - Eawag-Empa Library

24, 33, 34, 42, 481, the excellent treatment of the TCD in the book by Jentzsch and
Otte [18] should be mentioned. Some examples of TCD applications are given in
Table 2.7. When the TCD is compared with other detectors, for example the discharge
detector [l], E CD [5] or FP D [14], better parameters are usually found for the TCD.
Comparison of the TCD with the FID [4, 35, 371 depends on the structures of the
eluted substances. The TCD is, of course, more suitable for inorganic gases such as
CS,, COS, H,S and SO, [35]. During measurement of the signal ratio, S"/SrCD,
n
FIG. 2.12. Analysis of air using a TCD with a transmodulator [23].
values greater than unity were obtained for alkanes, and values smaller than unity for
oxygen-containing compounds [37]. It can be presumed that the thermal conductivity
detector will find further use in analyses of inorganic gases, of silylated samples, etc.
[26]. A thermal conductivity detector with a palladium transmodulator [23] gave
excellent results in analyses for rare gases in air (Fig. 2.12).
2.5 LITERATURE
I. Arnikar H. J., Rao T. S., Karmarkar K. 13.: J. Chrornatogr. 38, 126 (1968)
2. Barry E. F., Rosie D. M.: J. Chrorwtogr. 59. 269 (1971)
3. Barry E. F., Jr.: Chenz. Abslr. 76, 50 486c (1972)
3a. Beskova G. S., Filipov V. S.: Zaaod. Lab. 38, 154 (1972)
4. Bogoslovskii Yu. N., Razin V. L.: Zlz. Fiz. Khim. 45, 2490 (1971)
5. Brazhnikov V. V., Sakodynskii K. I.: Clzern. Absrr. 74, 94 013j (1971)
6. Castello G., DAmato G.: J. Chromatogr. 32, 625 (1968)
7. Chowdhury B., Karasek F. W.: J. Chroniatogr. Sci. 8, 199 (1970)
8. Cieplinski E. W., Spencer S. F., Illingsworth W. L.: US Pat. 3,537,914 (Nov. 3, 1970)
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