Nitrogen oxide concentration ratio

Figure 5-13 is misleading in the sense that it suggests a continuous rise of the ozone production rate with increasing nitrogen oxide concentration. The mechanism considered above does not yet include reactions of radicals with N02, however. The neglect of these reactions is permitted for N02 mixing ratios less than 200 pptv. The reaction of foremost importance is the termination process... 

Suda Y, Kawasaki H, Ueda T, Ohshima T (2005) Preparation of nitrogen-doped titanium oxide thin film using a PLD method as parameters of target material and nitrogen concentration ratio in nitrogen/oxygen gas mixture. Thin Solid Films 475 337-341... 

While these vary depending on compound class, for aU POPs considered in this chapter, indoor-outdoor air concentration ratios exceed 1 (Abdallah, Harrad, and Covaci, 2008 Currado and Harrad, 1998 Harrad, Hazrati, and Ibarra, 2006 Shoeib et ah, 2004, 2005). Hence, unlike classical air pollutants like particulate matter, nitrogen oxides, and ozone, there appears negligible influence of outdoor sources on the indoor environment. 

The net conversion of NO to NO2 is limited to the photodissociation of NO2 (NO2 -H hv — NO -1- O). As atomic oxygen rapidly recombines with oxygen to yield ozone, a photostationary state is reached, which governs the concentration of NO, NO2 and O3, the ratio between the two nitrogen oxides being determined by the light intensity. 

The conversion from ammonia to nitrogen oxides in the gas turbine was dependent on the concentration of the ammonia. At higher ammonia levels the conversion ratio was lower. The conversion ratio was 60-70% for the standard fuel mixture of bark and... 

Generally, most asphalt is 79-88% w/w carbon, 7-13% w/w hydrogen, trace-8% w/w sulfur, 2-8% w/w oxygen, and trace-3% w/w nitrogen.Trace metals such as iron, nickel, vanadium, calcium, titanium, magnesium, sodium, cobalt, copper, tin, and zinc occur in crude oils. Vanadium and nickel are bound in organic complexes and, by virtue of the concentration (distillation) process by which asphalt is manufactured, are also found in asphalt. The catalytic behavior of vanadium has prompted studies of the relation between vanadium content and an asphalt s sensitivity to oxidation (viscosity ratio).The significance of metals in the behavior of asphalts is not yet well understood or defined. 

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