Method for preconcentrating a sample for subsequent analysis

Patent · Mon Jan 01 00:00:00 EST 1990

OSTI ID:867457

Zaromb, Solomon ^[1]

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1. Hinsdale, IL

A system for analysis of trace concentration 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is added after preconcentration of the contaminants for dissolving the contaminants, the liquid solution then being withdrawn for injection into the chromatograph.

• Research Organization: Argonne National Laboratory (ANL), Argonne, IL (United States)
• DOE Contract Number: W-31109-ENG-38
• Assignee: United States of America as represented by United States (Washington, DC)
• Patent Number(s): US 4942135
• OSTI ID: 867457
• Country of Publication: United States
• Language: English

Related Subjects

method
preconcentrating
sample
subsequent
analysis
trace
concentration
contaminants
air
portable
liquid
chromatograph
preconcentrator
analyzed
bag
inlet
valve
outlet
collecting
collected
connected
series
sorbing
apparatus
recirculation
loop
inner
gas-permeable
container
containing
sorbent
material
outer
gas-impermeable
circulated
trapping
composition
mobile
phase
direct
injection
thereinto
alternatively
porous
solid
added
preconcentration
dissolving
solution
withdrawn
mobile phase
phase liquid
outlet valve
inlet valve
liquid chromatograph
subsequent analysis
inner container
outer container
liquid solution
sorbent material
air sample
container containing
recirculation loop
circulation loop
direct injection
trace concentration
portable liquid
/436/73/95/96/422/