A relative rate study of the reaction of bromine atoms with a variety of organic compounds at 295 K

1989 ◽  
Vol 21 (11) ◽  
pp. 1069-1076 ◽  
Author(s):  
Timothy J. Wallington ◽  
Loretta M. Skewes ◽  
Walter O. Siegl ◽  
Steven M. Japar
Keyword(s):  
Organic Compounds ◽  
Relative Rate ◽  
Rate Study

ChemInform Abstract: A Relative Rate Study of the Reaction of Bromine Atoms with a Variety of Organic Compounds at 295 K

ChemInform ◽  
1990 ◽  
Vol 21 (6) ◽  
Author(s):  
T. J. WALLINGTON ◽  
L. M. SKEWES ◽  
W. O. SIEGL ◽  
S. M. JAPAR
Keyword(s):  
Organic Compounds ◽  
Relative Rate ◽  
Rate Study

scholarly journals Uptake of NO<sub>3</sub> and N<sub>2</sub>O<sub>5</sub> to Saharan dust, ambient urban aerosol and soot: a relative rate study

2010 ◽  
Vol 10 (6) ◽  
pp. 2965-2974 ◽  
Author(s):  
M. J. Tang ◽  
J. Thieser ◽  
G. Schuster ◽  
J. N. Crowley
Keyword(s):  
Mineral Dust ◽  
Relative Rate ◽  
Simultaneous Detection ◽  
Saharan Dust ◽  
Uptake Coefficient ◽  
Ambient Aerosols ◽  
Mixing Ratios ◽  
A Value ◽  
Rate Study ◽  
Absolute Basis

Abstract. The uptake of NO3 and N2O5 to Saharan dust, ambient aerosols and soot was investigated using a novel and simple relative rate method with simultaneous detection of both NO3 and N2O5. The use of cavity ring down spectroscopy to detect both trace gases enabled the measurements to be carried out at low mixing ratios (<500 pptv or 1×1010 molecule cm−3). The uptake coefficient ratio, γ(NO3)/γ(N2O5), was determined to be 0.9±0.4 for Saharan dust, independent of relative humidity, NO3 or N2O5 mixing ratio and exposure time. Ambient (urban) aerosols showed a very limited capacity to take up N2O5 but were reactive towards NO3 with γ(NO3)/γ(N2O5)>15. A value of γ(NO3)/γ(N2O5)~1.5–3 was obtained when using candle generated soot. The relative rate obtained for Saharan dust can be placed on an absolute basis using our recently determined value of γ(N2O5)=1×10−2 to give γ(NO3)=9×10−3, which is significantly smaller than the single previous value. With the present uptake coefficient, reaction of NO3 with mineral dust will generally not contribute significantly to its NO3 loss in the boundary atmosphere or to the nitration of mineral dust.

Relative rate study of the addition of HO2 radicals to C2H4 and C3H6

1986 ◽  
Vol 82 (9) ◽  
pp. 1445 ◽  
Author(s):  
Roy R. Baldwin ◽  
Christopher E. Dean ◽  
Raymond W. Walker
Keyword(s):  
Relative Rate ◽  
Rate Study

Cavity Ring-Down Spectroscopy and Relative Rate Study of Reactions of HCO Radicals with O2, NO, NO2, and Cl2at 295 K

2000 ◽  
Vol 104 (32) ◽  
pp. 7556-7564 ◽  
Author(s):  
Yuki Ninomiya ◽  
Masashi Goto ◽  
Satoshi Hashimoto ◽  
Yoshihisa Kagawa ◽  
Kazunari Yoshizawa ◽  
...  
Keyword(s):  
Relative Rate ◽  
Cavity Ring Down Spectroscopy ◽  
Rate Study ◽  
Cavity Ring Down

scholarly journals Uptake of NO<sub>3</sub> and N<sub>2</sub>O<sub>5</sub> to Saharan dust, ambient urban aerosol and soot: a relative rate study

2010 ◽  
Vol 10 (1) ◽  
pp. 391-415
Author(s):  
M. J. Tang ◽  
J. Thieser ◽  
G. Schuster ◽  
J. N. Crowley
Keyword(s):  
Mineral Dust ◽  
Relative Rate ◽  
Simultaneous Detection ◽  
Saharan Dust ◽  
Uptake Coefficient ◽  
Ambient Aerosols ◽  
Mixing Ratios ◽  
A Value ◽  
Rate Study ◽  
Absolute Basis

Abstract. The uptake of NO3 and N2O5 to Saharan dust, ambient aerosols and soot was investigated using a novel and simple relative rate method with simultaneous detection of both NO3 and N2O5. The use of cavity ring down spectroscopy to detect both trace gases enabled the measurements to be carried out at low mixing ratios (<500 pptv or 1×1010 molecule cm-3). The uptake coefficient ratio, γ(3)/γ(N2O5), was determined to be 0.9±0.4 for Saharan dust, independent of relative humidity, NO3 or N2O5 mixing ratio and exposure time. Ambient (urban) aerosols showed a very limited capacity to take up N2O5 but were reactive towards 3 with γ(NO3)/γ(N2O5)>15. A value of γ(NO3)/γ(N2O5)≈1.5–3 was obtained when using candle generated soot. The relative rate obtained for Saharan dust can be placed on an absolute basis using our recently determined value of γ(N2O5)=1×10−2 to give γ(NO3)=9×10-3, which is significantly smaller than the single previous value. With the present uptake coefficient, reaction of NO3 with mineral dust will generally not contribute significantly to its NO3 loss in the boundary atmosphere or to the nitration of mineral dust.

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