Temperature-dependent collection efficiency of a cryogenic trap for trace-level volatile organic compounds

Technical Report · Tue May 01 04:00:00 EDT 1984

OSTI ID:6629295

Pleil, J D; McClenny, W A

Reduced temperature preconcentration of volatile organic compounds in a packed trap is examined experimentally as a function of trapping temperatures ranging from -180C to +100C. Trapped compounds are thermally desorbed into a capillary column-equipped gas chromatograph and quantified with a flame ionization detector. Data sets are presented for 21 compounds of environmental interest at various concentrations (in dry zero air) in the range of 0.1 ppbv to 100 ppbv. Measured chromatographic peak areas increase from a low but non-zero value for high trap-temperature runs to a constant value as the trap temperature is lowered. Extrapolated Clausius-Clapeyron equations are shown to be a useful guide in estimating the trap temperature required for 99% collection efficiency.

• Research Organization: Northrop Services, Inc., Research Triangle Park, NC (USA)
• OSTI ID: 6629295
• Report Number(s): PB-84-195403
• Country of Publication: United States
• Language: English

Related Subjects

500200* -- Environment
Atmospheric-- Chemicals Monitoring & Transport-- (-1989)
54 ENVIRONMENTAL SCIENCES
AIR POLLUTION
CHEMICAL ANALYSIS
CRYOGENICS
GAS ANALYSIS
HYDROCARBONS
MONITORING
ORGANIC COMPOUNDS
POLLUTION
SAMPLING
SEPARATION PROCESSES
TEMPERATURE EFFECTS
TRAPS