Chlorine specific gas chromatographic detector

G - Physics – 01 – N

Patent

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Details

G01N 21/75 (2006.01) G01N 30/00 (2006.01) G01N 30/64 (2006.01) G01N 30/74 (2006.01)

Patent

CA 2213974

A method and apparatus are set forth which enables a gas chromatographic column output to be connected with a pulse discharge chamber in which chemically bound chlorine in volatile organic or inorganic samples is measured. A spark discharge is formed in the chamber to ionize and excite helium molecules to a metastable state. In turn, that transfers excitation to a trace of krypton gas in the chamber which is ionized, and the ionized krypton then preferentially binds with chemically bound chlorine. The latter binding occurs with the liberation of a photon centered at about 222 nanometers thereby defining a spectral region of interest which is measured by a photomultiplier tube to quantify chemically bound chlorine.

Divulgation d'une méthode et d'un appareil permettant de relier la sortie d'une colonne de chromatographie en phase gazeuse à une chambre à décharge pulsée dans laquelle on mesure la teneur en chlore lié chimiquement dans des échantillons volatiles organiques ou inorganiques. On forme un arc électrique dans la chambre afin d'ioniser et d'exciter des atomes d'hélium jusqu'à un état métastable. Ces atomes d'hélium transfèrent ensuite cette excitation à une trace de krypton gazeux présent dans la chambre et l'ionisent ainsi. Le krypton ionisé se lie de préférence au chlore lié chimiquement. Cette dernière liaison s'accompagne de l'émission d'un photon de longueur d'onde centrée à environ 222 nanomètres, définissant ainsi une région spectrale dont on peut se servir pour quantifier le chlore lié chimiquement, grâce à un tube photomultiplicateur.

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