Analytical instrument with apparatus for sample concentrating

Chemistry: analytical and immunological testing – Including sample preparation – Liberation or purification of sample or separation of...

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436161, 436168, 422 69, 422 70, 55 16, 55158, 73 611C, 7386323, G01N 118

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048290084

ABSTRACT:
A system for analysis of trace concentrations of contaminants in air includes a portable liquid chromatograph and a preconcentrator for the contaminants to be analyzed. The preconcentrator includes a sample bag having an inlet valve and an outlet valve for collecting an air sample. When the sample is collected the sample bag is connected in series with a sorbing apparatus in a recirculation loop. The sorbing apparatus has an inner gas-permeable container containing a sorbent material and an outer gas-impermeable container. The sample is circulated through the outer container and around the inner container for trapping and preconcentrating the contaminants in the sorbent material. The sorbent material may be a liquid having the same composition as the mobile phase of the chromatograph for direct injection thereinto. Alternatively, the sorbent material may be a porous, solid body, to which mobile phase liquid is added after preconcentration of the contaminants for dissolving the contaminants, the liquid solution then being withdrawn for injection into the chromatograph.

REFERENCES:
patent: 3352644 (1967-11-01), Lysyj
patent: 3751879 (1973-08-01), Allington
patent: 4311789 (1982-01-01), Nylen et al.
patent: 4529521 (1985-07-01), Cortes et al.
"Sampling and Determiniation of Gas-Phase Hydrogen Peroxide Following Removal of Ozone by Gas-Phase Reaction with Nitric Oxide", vol. 58, No. 8 of Analytical Chemistry, pp. 1857-1865 (Jul. 1986) by Tanner et al.
Article entitled "Silicone Rubber Tubing for Elimination of Background Conductivity in Anion Chromatography", Analytical Chemistry, 1984, vol. 56, p. 1033, Siemer et al.
"Carbon Dioxide Permeable Tubing for Postsuppression in Ion Chromatography", by Darryl D. Siemer, American Chemical Society, 1984.

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