Method and apparatus for ion discrimination in an electron capture detector

摘要

Electron capture detector for use with an effluent stream (E) from a gas chromatograph includes an ionization chamber (256) and a sample inlet system (250) connected to the ionization chamber (256) wherein the sample inlet system (250) effects uniform fluid mixture (X) of the effluent (E) fluid and a make-up gas (M) prior to entry of the fluid mixture (X) into the ionization chamber (256). A preferred mixing device includes a column liner (500) having a flow acceleration region (510) wherein a localized reduction in the internal diameter of the liner (500) causes momentary turbulence of the fluid mixture. <IMAGE>