Device for sampling and stripping volatile chemicals within well

Details Device for sampling and stripping volatile chemicals within well Device for sampling and stripping volatile chemicals within well

1990-11-13

1992-09-15

Dawson, Robert A.

Liquid purification or separation

Processes

Including geographic feature

73 1G, 73 191, 7386302, 7386323, 166264, 166265, 210170, 210188, 436 39, 436178, B02D 1900, E21B 4908

Patent

active

051475618

ABSTRACT:
A sampling device for sealed positioning within the casing of a well contains a stripping chamber for stripping a ground water sample of its volatile compounds at or near the point of collection. In one embodiment, the stripping chamber includes a piston which is raised above the top surface of the sample to create a head space, and an injector for injecting inert gas into the sample, causing the volatile compounds to be released into the head space, whereupon they exit the chamber via a vapor outlet duct leading out of the well. In a second embodiment, the stripping chamber includes a tube having a sidewall formed of a semi-permeable membrane, and an injector which injects an inert gas into the bore of the tube. The device may also include a sensor mounted within the stripping chamber, and a valve for directing a calibration gas into the chamber.

REFERENCES:
patent: 4003257 (1977-01-01), Fletcher et al.
patent: 4630677 (1986-12-01), Jakob
patent: 4717473 (1988-01-01), Burge et al.
patent: 4764272 (1988-08-01), Fox, Sr.
patent: 4821585 (1989-04-01), Kempe
patent: 4857473 (1989-08-01), Margaritz et al.
patent: 4922747 (1990-05-01), Wall
patent: 5010776 (1991-04-01), Lucero et al.

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