Environmental monitoring of organic compounds

G - Physics – 01 – N

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G01N 30/00 (2006.01) G01N 1/10 (2006.01) G01N 1/34 (2006.01) G01N 30/04 (2006.01) G01N 30/08 (2006.01) G01N 33/18 (2006.01) G01N 1/40 (2006.01) G01N 30/12 (2006.01) G01N 30/14 (2006.01) G01N 30/62 (2006.01) G01N 30/72 (2006.01) G01N 33/24 (2006.01)

Patent

CA 2172520

Environmental monitoring of low concentra- tion of organic compounds in a medium such as ground water is effected by using a diffusion cell (112) having a polymeric membrane formed into a helical tube (125) and immersed in the envi- ronmental fluid so that organic compounds at ppb and ppt concentrations diffuse into and through the polymeric material. A carrier gas in the polymeric tube acquires a concentration of the organic com- pounds substantially in equilibrium with the con- centration of the organic compounds in the en- vironmental fluid. For the purpose of permitting monitoring with detectors (116) which are not sen- sitive to extremely low levels of organic com- pounds, a concentrating device such as a thermal desorption tube (114) can be provided for process- ing the gas and periodic thermal activation to dis- charge therefrom organic compounds to be detected at a sensor.

On procède à la surveillance environnementale de faibles concentrations de composés organiques dans un milieu tel que la nappe phréatique en utilisant une cellule de diffusion (112) constituée d'une membrane polymère formant des tubes hélicoïdaux (125) et immergée dans le fluide environnant de sorte que les composés organiques à des concentrations ppb et ppt soient diffusés dans et à travers le matériau polymère. Un gaz porteur dans le tube polymère acquiert une concentration des composés organiques sensiblement équilibrée avec la concentration de composés organiques dans le fluide environnant. De manière à permettre le contrôle au moyen de détecteurs (116) qui ne sont pas sensibles à des taux extrêmement faibles de composés organiques, un dispositif de concentration tel qu'un tube de désorption thermique (114) peut être prévu pour traiter le gaz et l'activation thermique périodique et décharger de celui-ci les composés organiques devant être détectés par un capteur.

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