Analytical instrument with apparatus for sample concentrating

Patent · Sat Dec 31 23:00:00 EST 1988

OSTI ID:866954

Zaromb, Solomon ^[1]

---

1. Hinsdale, IL

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is added after preconcentration of the contaminants for dissolving the contaminants, the liquid solution then being withdrawn for injection into the chromatograph.

• Research Organization: Argonne National Laboratory (ANL), Argonne, IL
• DOE Contract Number: W-31109-ENG-38
• Assignee: United States of America as represented by United States (Washington, DC)
• Patent Number(s): US 4829008
• OSTI ID: 866954
• Country of Publication: United States
• Language: English

Related Subjects

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withdrawn