Method for preconcentrating a sample for subsequent analysis

Patent · Tue Jul 17 00:00:00 EDT 1990

OSTI ID:5775423

Zaromb, S

This patent describes a system for analysis of trace concentration of contaminants in air which 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 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 materials 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is added after preconcentration of the contaminants for dissolving the contaminants, the liquid solution then being withdrawn for injection into the chromatograph.

• Assignee: Dept. of Energy, Washington, DC (USA)
• Patent Number(s): A; US 4942135
• Application Number: PPN: US s 7-337983
• OSTI ID: 5775423
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400102 -- Chemical & Spectral Procedures
54 ENVIRONMENTAL SCIENCES
540120* -- Environment
Atmospheric-- Chemicals Monitoring & Transport-- (1990-)
AIR
AIR POLLUTION CONTROL
AIR POLLUTION MONITORING
AIR SAMPLERS
CHEMICAL ANALYSIS
CHROMATOGRAPHY
CONTROL
EQUIPMENT
FLUIDS
GASES
LIQUID COLUMN CHROMATOGRAPHY
MONITORING
POLLUTION CONTROL
PORTABLE EQUIPMENT
SAMPLERS
SEPARATION PROCESSES