Measurements of atmospheric carbon disulfide using aircraft platforms and a GC/MS isotopic dilution analysis technique
A Finnigan Model 4023 gas chromatograph-mass spectrometer (GC/MS) was optimized to measure low parts-per-trillion levels of CS/sub 2/ using an isotopic dilution technique and preconcentration on Carbosieve B adsorber. The breakthrough volume, desorption efficiency, and decay rate of CS/sub 2/ test atmospheres sampled by Carbosieve B packed traps were determined. A calibration curve of GC/MS response as a function of CS/sub 2/(80) concentration in the low pptv range showed a precision of 1% and an accuracy of 5%. The method was developed for field deployment on aircraft platforms by efficiently sealing sample traps and removing contamination degassing from sampler and tube components and leaks in the sampler system during sampling. Using the NASA Electra aircraft, free tropospheric CS/sub 2/ was sampled on packed traps over a 92/sup 0/ latitude range. Samples were analyzed by GC/MS. The mean and standard deviation of 43 CS/sub 2/ data were 5.5 +/- 1.9 pptv. A lower limit of detection of 0.04 pmoles of CS/sub 2/ was achieved.
- OSTI ID:
- 5529486
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
400102* -- Chemical & Spectral Procedures
400104 -- Spectral Procedures-- (-1987)
500200 -- Environment
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54 ENVIRONMENTAL SCIENCES
AIR
AIR SAMPLERS
AIRCRAFT
CARBON COMPOUNDS
CARBON SULFIDES
CHALCOGENIDES
CHEMICAL ANALYSIS
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
CHROMATOGRAPHY
DATA
EARTH ATMOSPHERE
EQUIPMENT
EXPERIMENTAL DATA
FLUIDS
GAS CHROMATOGRAPHY
GASES
HYDROGEN COMPOUNDS
HYDROGEN SULFIDES
HYDROXYL RADICALS
INFORMATION
ISOTOPE APPLICATIONS
ISOTOPE DILUTION
KINETICS
MASS SPECTROSCOPY
NUMERICAL DATA
OXIDATION
PHOTOCHEMICAL REACTIONS
QUANTITATIVE CHEMICAL ANALYSIS
RADICALS
REACTION KINETICS
SAMPLERS
SEPARATION PROCESSES
SPECTROSCOPY
SULFIDES
SULFUR COMPOUNDS
TRACE AMOUNTS
TRACER TECHNIQUES
TROPOSPHERE