Citation:

Hites, R. A. AND W. W. Brubaker. OH REACTION KINETICS OF GAS-PHASE A- AND G-HEXACHLOROCYCLOHEXANE AND HEXACHLOROBENZENE. (R825377). ENVIRONMENTAL SCIENCE & TECHNOLOGY. American Chemical Society, Washington, DC, 32:766-769, (1998).

Description:

Rate constants for the gas-phase reactions of the hydroxyl
radical (OH) with - and -hexachlorocyclohexane (-
and -HCH) and hexachlorobenzene (HCB) were measured
over the temperature range 346-386 K. The
experiments
were carried out in He diluent gas at approximately 1 atm,
in a 160-mL quartz chamber. OH was produced by the
photolysis of ozone in the presence of H₂O, and
reactants
in the chamber were monitored by online mass spectrometry. The rate constants measured at elevated tem
peratures were extrapolated by the Arrhenius equation,
and OH reaction rate constants at 298 K were estimated for
each compound. These rate constants at 298 K (in
units
of 10^-13 cm³ s^-1) were -HCH,
1.4; -HCH, 1.9; and HCB,
0.27. Atmospheric lifetimes based on OH reactions
(_OH)
were also estimated (in units of days): -HCH, 120;
-HCH,
96; and HCB, 940. These relatively high atmospheric
lifetimes indicate that these compounds can be transported
great distances through the atmosphere before removal
processes associated with the global distillation
effect.

Record Details:

Record Type:DOCUMENT( JOURNAL/ PEER REVIEWED JOURNAL)

Product Published Date:01/01/1998

Record Last Revised:12/22/2005

Record ID: 67749

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Document IDs:

EPA Number :R825377