A portable inhalation system for personal exposure to ozone.
A low-cost portable inhalation system was developed for exposing an individual subject to 60-600 parts per billion of ozone in a 30-l clear-plastic head dome. The inhalation system had the following novel features: a canister vacuum cleaner that supplied room air without the need for precleaning or humidification; a 7% oxygen-in-nitrogen feed to a commercial ultraviolet ozonator that avoided an excess production of ozone; a compact inline mixer that assured homogeneous mixing of the 200-300 liters per minute room air supply with the 0.5-1.0 liters per minute of ozonated gas flow, positioning of gas inlet and exhaust hoses on the head dome that provided fresh gas delivery in the vicinity of the mouth; a quick-disconnect neck seal that allowed rapid donning of the head dome by the subject, and mounting of most system components on a small mobile cart. Temperature, humidity, and ozone and carbon dioxide concentrations were measured inside the dome while a subject exercised on a bicycle ergometer. An air flow of 200 liters per minute between rest and light exercise created a suitable microenvironment in the dome. During moderate and heavy exercise, however, a higher flow of 300 liters per minute should be used to suppress the build-up of carbon dioxide and humidity.
Asplund
P T
PT
Department of Chemical Engineering, Pennsylvania State University, University Park, USA.
Ben-Jebria
A
A
Ultman
J S
JS
D000328:Adult; D001273:Atmosphere Exposure Chambers; D004867:Equipment Design; D005069:Evaluation Studies as Topic; D005080:Exercise Test; D006801:Humans; D006813:Humidity; D008297:Male; D008348:Manikins; D010126:Ozone / Q000008:administration & dosage*; D011659:Pulmonary Gas Exchange / Q000187:drug effects; D012119:Respiration / Q000187:drug effects
D010126:Ozone