A simple air sampling technique for monitoring nitrous oxide pollution.
A simple, inexpensive device for the continuous low-flow sampling of air was devised to permit monitoring of pollution by gaseous anaesthetics. The device consisted of a water-filled Perspex cylinder in which a double-walled flexible-film gas sample collection bag was suspended. Air samples could be aspirated into the collection bag at flow rates of as low as 1 ml min-1 by allowing the water to drain from the cylinder at a controlled rate. The maintenance of sample integrity with aspiration and storage of samples of nitrous oxide in air at concentrations of 1000, 100 and 30 p.p.m. v/v was examined using gas chromatography. The sample bags retained a mean 94% of the nitrous oxide in air samples containing nitrous oxide 25 p.p.m. over a 72-h storage period.
D000393:Air Pollutants / Q000032:analysis*; D000395:Air Pollutants, Occupational / Q000032:analysis*; D000397:Air Pollution / Q000032:analysis*; D000776:Anesthesiology / Q000295:instrumentation; D003770:Dental Offices; D004867:Equipment Design; D005069:Evaluation Studies as Topic; D008722:Methods; D009609:Nitrous Oxide / Q000032:analysis*; D009873:Operating Rooms
D000393:Air Pollutants; D000395:Air Pollutants, Occupational; D009609:Nitrous Oxide