Passive Monitoring For Nitrous Oxide. NIOSH Technical Report.
Cassinelli ME; Hull RD
NIOSH 1983 Feb:40 pages
A commercial passive nitrous-oxide (10024972) monitor was evaluated. The monitor, developed and marketed by Solid State Sensor Company, Lisle, Illinois, depended on molecular diffusion of the analyte to the collection medium. Precision and accuracy were determined by exposing the monitor to 12.5 to 100 parts per million nitrous-oxide for up to 6 hours at relative humidities of 0 to 90 percent. The samples were stored for up to 2 weeks before analysis. Samples were thermally desorbed and analyzed by infrared spectrophotometry. Monitors were spiked with 20 micrograms of nitrous-oxide, stored for 1 week, and the percent recovery was determined. Field samples were collected in hospitals and dental offices. In the laboratory and field tests, the monitors over sampled for short exposure times and under sampled for long exposure times. Precision of monitors analyzed on the day of exposure ranged from 9 to 22 percent relative standard deviation; precision of monitors stored for 2 weeks was 20 to 30 percent RSD. Average percent of recovery of the spiked samples was 54 to 60 percent. None of the results were affected by humidity changes. The authors conclude that the performance of the monitor is unsatisfactory.
NIOSH-Author; Air-quality-monitoring; Toxic-gases; Workplace-studies; Quantitative-analysis; Measurement-equipment; Monitoring-systems; Analytical-methods; Equipment-design; Air-sampling-equipment;
NTIS Accession No.
Division of Physical Sciences and Engineering, NIOSH, Centers for Disease Control, Public Health Service, U.S. Department of Health and Human Services, Cincinnati, Ohio, 40 pages, 15 references