NIOSH 1978 Oct:14 pages
An analytical method was developed for the determination of airborne concentrations of sulfur-hexafluoride (2551624). A known volume of air was collected in a five layer gas sampling bag using a personal pump. The sample was then analyzed using a gas chromatograph with a thermal conductivity detector. The method was validated by the analysis of 18 samples representing 50, 100, and 200 percent of the OSHA standard of 1000 parts per million (ppm), and 18 dynamically generated test samples. Storage stability of the samples and precision and accuracy of the method were assessed. The total coefficient of variance for the method was 0.031 in a range of 500 to 2010ppm. Samples collected and analyzed immediately and after 1 week of storage contained a mean of 989 and 987ppm, respectively. The authors conclude that the advantages of the method are that it is portable and involves no liquids. Interferences are minimal and analysis is quick. One disadvantage is that the sampling bag is bulky and may be punctured during sampling or shipping.
NIOSH-Author; NIOSH-Analytical-Method; Analytical-Method; Standards; Sampling; Standards-Completion-Program; SCP; Set-6; Chemical-analysis; Chromatographic-analysis; Thermal-effects; Air-sampling;
NTIS Accession No.
Ten NIOSH Analytical Methods, Set-6, Division of Physical Sciences and Engineering, NIOSH, Cincinnati, Ohio, NTIS PB288-629, 14 pages, 5 references