Personal Atmospheric Gas Sampler With a Critical Orifice. Part 2. System for Handling and Analyzing the Gas From the Sampler.

Eaton-HG; Stone-JP; Williams-FW

Naval Research Laboratory, Washington, D.C., 1976 Mar:15 pages

00121725

The method of extracting and analyzing contaminants from the Naval Research Laboratory personal atmospheric gas sampler is described. The gases are extracted by vacuum at a pressure of 100 torr and carried through two subsystems into a gas chromatograph with a thermal conductivity cell and dual hydrogen flame ionization detectors. The first subsystems uses a backflush valve to detect ethane (74840), freon-12 (75718), vinyl-chloride (75014), freon-11 (75694), vinylidene-chloride (75354), hexane (110543), benzene (71432), and total hydrocarbons. The second subsystem uses a molecular sieve to detect methane (74828) and carbon-monoxide (630080). The backflush system allowed detection of less volatile hydrocarbons such as n-decane (124185) and additionally cleans the column. The sensitivity of the two systems was about 1 part per million for the gases analyzed.

NIOSH-Contract; Contract-IA-74-9; Analytical-methods; Air-contamination; Air-sampling-equipment; Chemical-analysis; Air-monitoring; Analytical-instruments; Analytical-processes; Gas-sampling;

74-84-0; 75-71-8; 75-01-4; 75-69-4; 75-35-4; 110-54-3; 71-43-2; 74-82-8; 630-08-0; 124-18-5;

19760322

Contract;

1976

Contract-IA-74-9

Naval Research Laboratory, Washington, D.C., 15 pages, 4 references

WA;