Chromatographia

, Volume 13, Issue 9, pp 567–571 | Cite as

The signal of the helium detector — Its shape and polarity

  • E. Broś
  • J. Lasa
Originals

Summary

Four main factors which determine the shape and the polarity of the helium detector signal are discussed. All possible responses of this detector, both in elution and in vacancy chromatography, are presented and special attention is drawn to the intermediate region. The idea of ionization vacancy is introduced for the specific case of two components which are unresolved by the column and to which the detector responds with different sensitivity.

Key Words

Gas chromatography Helium detector 

List of Symbols

Cd

concentration of a compound in the sample

ΔCd

difference between Cd and C01

C01

concentration of this compound in the carrier gas, present as impurity, at the point of injection

Cdc

concentration of this compound in the carrier gas added by means of a diffusion chamber

Cp

total concentration of this compound in the carrier gas at the detector, at peak maximum

ΔCp

part of Cp equal to peak height

C0

concentration of this compound in the carrier gas, present as impurity, at the detector. If there is no leak or back-diffusion in the system, then C0=C01. If a certain amount is added with help of a diffusion chamber, then C0=C01+Cdc

kd

rate constant of the Penning effect for the injected compound

k0

rate constant of the Penning effect for the impurity in the carrier gas

th

peak width at half height (in time units)

u

carrier gas volumetric flow rate. The symbol u instead of F is used for the volumetric flow rate in order to avoid any mix-up with the symbol F used to characterize one of the operation points (cf. Figs. 1a-1b)

Vd

gas volume in which the injected sample compound is present at the injection point

wd

detector sensitivity for the injected compound

w0

detector sensitivity for the impurity in the carrier gas

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References

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Copyright information

© Friedr. Vieweg & Sohn Verlagsgesellschaft mbH 1980

Authors and Affiliations

  • E. Broś
    • 1
  • J. Lasa
    • 1
  1. 1.Institute of Nuclear PhysicsKrakówPoland

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