nitrous acid

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  • noun

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an unstable inorganic acid known only in solution and as nitrite salts

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References in periodicals archive ?
As NO production from nitrite proceeds via HNO2 and N2O3 formation, which are both potent nitrosants [3], it remains to be clarified if one or both these intermediates are involved.
The on-line MARGA ADI 2080 (Applikon-ECN, The Netherlands) was used to acquire hourly concentrations of particulate sodium (Na+), ammonium (N[H.sub.4.sup.+]), potassium ([K.sup.+]), calcium ([Ca.sup.2+]), magnesium ([Mg.sup.2+]), chloride ([Cl.sup.-]), nitrate (N[O.sub.3.sup.-]), and sulfate (SO4 -) and mixing ratios of gas species ammonia (NH3), nitric acid (HN[O.sub.3]), nitrous acid (HNO2), hydrochloric acid (HCl), and sulfur dioxide (S[O.sub.2]).
(43) When saliva enters the acidic stomach (1-1.5 L per day), much of the nitrite is rapidly protonated to form nitrous acid (HNO2; pKa 3.3), which decomposes further to form NO and other nitrogen oxides.
Oxidation by radicals is very fast and may cause high concentrations of nitrogen dioxide at roadsides, especially if high concentrators of HNO2 provide OH radicals [3].
Day-time over-production of nitrous acid (HNO2) "can have a significant impact on the chemistry of the troposphere", the lowest, most dense and highly polluted layer of the atmosphere, according to researchers at the University of Wuppertal in Germany, the Paul Scherrer Institute in Switzerland and the Villeurbanne Laboratory on applied chemistry in the environment in France.