Nitric Oxide (NO)
NO is produced by combustion and by decomposition of organic matter. Combustion produces both NO and NO2, collectively denoted NOx, but most of the N oxides produced by combustion is NO. Combustion produces NO both by combination of N2 and O2 and by oxidation of any organic N in the fuel. In the United States, transportation accounts for approximately 40% of anthropogenic NOx emissions while combustion from stationary sources produces approximately 56%. (Wark and Warner 1981)
NO is slightly soluble in water. The Henry's law constant for NO is 1.9x10-3 mol/atm. The
atmospheric partial pressure of NO is 1-5x10-10 L-atm. NO reacts rapidly with O2 to form NO2. NO
plays an important part in some biological processes. NO biochemistry is the subject of much current
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