Abstract
The new wet chemical measurement techniques for determining nitrogen monoxide levels in urban air have been tested. The first method relies on an active principle and consists of three impregnated filters connected in series. The air`s nitrogen dioxide content is first removed by absorption in a sodium iodide impregnated filter which does not absorb NO. The next filter is impregnated with lead oxide which oxidizes the NO to NO{sub 2}. The third and final filter is similar to the first filter and thus absorbs the NO{sub 2} originating from the oxidized NO. The technique is used for measuring 24 hour average values of NO and NO{sub 2} concentrations. One of the advantages of the method is that the concentrations are determined separately. The second technique is based on a passive principle and two diffusion samplers are used: one measuring solely NO{sub 2} and one measuring the sum of NO and NO{sub 2}. Each sampler consists of a tube which is open at one end and equipped with an impregnated filter at the other end. The underlying principle for the method relies on the thermal diffusion of gas molecules. The active and passive samplers have been used simultaneously with chemiluminescence instruments
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Citation Formats
Ferm, M, and Svanberg, P A.
Testing of simple measuring methods for determination of NO/NO{sub x} concentrations in ambient air; Utprovning av enkla maetmetoder foer bestaemning av NO/NO{sub x}-halter i utomhusluft.
Sweden: N. p.,
1993.
Web.
Ferm, M, & Svanberg, P A.
Testing of simple measuring methods for determination of NO/NO{sub x} concentrations in ambient air; Utprovning av enkla maetmetoder foer bestaemning av NO/NO{sub x}-halter i utomhusluft.
Sweden.
Ferm, M, and Svanberg, P A.
1993.
"Testing of simple measuring methods for determination of NO/NO{sub x} concentrations in ambient air; Utprovning av enkla maetmetoder foer bestaemning av NO/NO{sub x}-halter i utomhusluft."
Sweden.
@misc{etde_10125057,
title = {Testing of simple measuring methods for determination of NO/NO{sub x} concentrations in ambient air; Utprovning av enkla maetmetoder foer bestaemning av NO/NO{sub x}-halter i utomhusluft}
author = {Ferm, M, and Svanberg, P A}
abstractNote = {The new wet chemical measurement techniques for determining nitrogen monoxide levels in urban air have been tested. The first method relies on an active principle and consists of three impregnated filters connected in series. The air`s nitrogen dioxide content is first removed by absorption in a sodium iodide impregnated filter which does not absorb NO. The next filter is impregnated with lead oxide which oxidizes the NO to NO{sub 2}. The third and final filter is similar to the first filter and thus absorbs the NO{sub 2} originating from the oxidized NO. The technique is used for measuring 24 hour average values of NO and NO{sub 2} concentrations. One of the advantages of the method is that the concentrations are determined separately. The second technique is based on a passive principle and two diffusion samplers are used: one measuring solely NO{sub 2} and one measuring the sum of NO and NO{sub 2}. Each sampler consists of a tube which is open at one end and equipped with an impregnated filter at the other end. The underlying principle for the method relies on the thermal diffusion of gas molecules. The active and passive samplers have been used simultaneously with chemiluminescence instruments at three sites. The results showed good agreement between the active and passive samplers at all sites but good agreement with the chemiluminescence technique was only obtained at one site. 3 refs, 9 figs, 1 tab}
place = {Sweden}
year = {1993}
month = {Dec}
}
title = {Testing of simple measuring methods for determination of NO/NO{sub x} concentrations in ambient air; Utprovning av enkla maetmetoder foer bestaemning av NO/NO{sub x}-halter i utomhusluft}
author = {Ferm, M, and Svanberg, P A}
abstractNote = {The new wet chemical measurement techniques for determining nitrogen monoxide levels in urban air have been tested. The first method relies on an active principle and consists of three impregnated filters connected in series. The air`s nitrogen dioxide content is first removed by absorption in a sodium iodide impregnated filter which does not absorb NO. The next filter is impregnated with lead oxide which oxidizes the NO to NO{sub 2}. The third and final filter is similar to the first filter and thus absorbs the NO{sub 2} originating from the oxidized NO. The technique is used for measuring 24 hour average values of NO and NO{sub 2} concentrations. One of the advantages of the method is that the concentrations are determined separately. The second technique is based on a passive principle and two diffusion samplers are used: one measuring solely NO{sub 2} and one measuring the sum of NO and NO{sub 2}. Each sampler consists of a tube which is open at one end and equipped with an impregnated filter at the other end. The underlying principle for the method relies on the thermal diffusion of gas molecules. The active and passive samplers have been used simultaneously with chemiluminescence instruments at three sites. The results showed good agreement between the active and passive samplers at all sites but good agreement with the chemiluminescence technique was only obtained at one site. 3 refs, 9 figs, 1 tab}
place = {Sweden}
year = {1993}
month = {Dec}
}