Abstract
Peak concentrations of NO{sub 2} which may be encountered in ambient and indoor environments may prove acute effects on the respiratory systems. One possible confounding factor in NO{sub 2} exposure studies is the presence of other nitrogen oxides in the exposure environment. It is likely that HONO and HNO{sub 3} formation may be influenced by the type of surface material (i.e. the chamber walls and furnishings) present in the chamber and the surface-to-volume ratio. In this investigation we sought to measure the production of HONO in a stainless steel exposure chamber into which known concentrations of NO{sub 2} were introduced from gas cylinders. It is concluded that although HONO was present in the chamber environment, it is extremely unlikely that concentrations were high enough to have any effect on the NO{sub 2} exposure response relationship. Further tests indicate the strong association between HONO production and relative humidity. Our finding that the presence of a wool carpet in the chamber did not increase HONO production indicates that the nature of the surfaces present for reactions to occur is important. We found HONO concentrations to be a function of the residence time in the chamber, and our results indicate that residence times
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Brauer, M;
Spengler, J D;
[1]
Rasmussen, T R;
Kjaergaard, S K
[2]
- Harvard School of Public Health. Department of Environmental Health (United States)
- University of Aarhus. Institute of Environmental and Occupational Medicine (Denmark)
Citation Formats
Brauer, M, Spengler, J D, Rasmussen, T R, and Kjaergaard, S K.
Assessment of nitrous acid formation in exposure chambers.
Denmark: N. p.,
1992.
Web.
Brauer, M, Spengler, J D, Rasmussen, T R, & Kjaergaard, S K.
Assessment of nitrous acid formation in exposure chambers.
Denmark.
Brauer, M, Spengler, J D, Rasmussen, T R, and Kjaergaard, S K.
1992.
"Assessment of nitrous acid formation in exposure chambers."
Denmark.
@misc{etde_10129693,
title = {Assessment of nitrous acid formation in exposure chambers}
author = {Brauer, M, Spengler, J D, Rasmussen, T R, and Kjaergaard, S K}
abstractNote = {Peak concentrations of NO{sub 2} which may be encountered in ambient and indoor environments may prove acute effects on the respiratory systems. One possible confounding factor in NO{sub 2} exposure studies is the presence of other nitrogen oxides in the exposure environment. It is likely that HONO and HNO{sub 3} formation may be influenced by the type of surface material (i.e. the chamber walls and furnishings) present in the chamber and the surface-to-volume ratio. In this investigation we sought to measure the production of HONO in a stainless steel exposure chamber into which known concentrations of NO{sub 2} were introduced from gas cylinders. It is concluded that although HONO was present in the chamber environment, it is extremely unlikely that concentrations were high enough to have any effect on the NO{sub 2} exposure response relationship. Further tests indicate the strong association between HONO production and relative humidity. Our finding that the presence of a wool carpet in the chamber did not increase HONO production indicates that the nature of the surfaces present for reactions to occur is important. We found HONO concentrations to be a function of the residence time in the chamber, and our results indicate that residence times of at least 20 minutes are required for measurable increases in the HONO concentration. (AB) (27 refs.).}
place = {Denmark}
year = {1992}
month = {Aug}
}
title = {Assessment of nitrous acid formation in exposure chambers}
author = {Brauer, M, Spengler, J D, Rasmussen, T R, and Kjaergaard, S K}
abstractNote = {Peak concentrations of NO{sub 2} which may be encountered in ambient and indoor environments may prove acute effects on the respiratory systems. One possible confounding factor in NO{sub 2} exposure studies is the presence of other nitrogen oxides in the exposure environment. It is likely that HONO and HNO{sub 3} formation may be influenced by the type of surface material (i.e. the chamber walls and furnishings) present in the chamber and the surface-to-volume ratio. In this investigation we sought to measure the production of HONO in a stainless steel exposure chamber into which known concentrations of NO{sub 2} were introduced from gas cylinders. It is concluded that although HONO was present in the chamber environment, it is extremely unlikely that concentrations were high enough to have any effect on the NO{sub 2} exposure response relationship. Further tests indicate the strong association between HONO production and relative humidity. Our finding that the presence of a wool carpet in the chamber did not increase HONO production indicates that the nature of the surfaces present for reactions to occur is important. We found HONO concentrations to be a function of the residence time in the chamber, and our results indicate that residence times of at least 20 minutes are required for measurable increases in the HONO concentration. (AB) (27 refs.).}
place = {Denmark}
year = {1992}
month = {Aug}
}