Nitrogen dioxide

CAS RN:10102-44-0

Environmental Fate

TERRESTRIAL FATE: Nitrogen dioxide is expected to decompose to nitric acid in moist soil surfaces(1). The potential for volatilization of nitrogen dioxide from dry soil surfaces may exist(SRC) based upon a vapor pressure of 900 mm Hg at 25 deg C(2).
AQUATIC FATE: If released into water, nitrogen dioxide is expected to decompose(1) to nitric acid(SRC).
ATMOSPHERIC FATE: Nitrogen dioxide, which has a vapor pressure of 900 mm Hg at 25 deg C(1), is expected to exist solely as a gas in the ambient atmosphere. Gas-phase nitrogen dioxide is degraded in the atmosphere by reaction with photochemically-produced hydroxyl radicals(SRC); the half-life for this reaction in air is estimated to be 35 hours(SRC) from its rate constant of 1.1X10-11 cu cm/molecule-sec at 25 deg C(2). This compound is expected to undergo direct photolysis in the environment(SRC), ultimately leading to the production of ozone and smog conditions in the lower troposphere(3).
Find more information on this substance at: Hazardous Substances Data Bank , TOXNET , PubMed