Kinetics of the gas-phase reactions of a series of organosilicon compounds with OH and NO sub 3 radicals and O sub 3 at 297 + 2K
- Univ. of California, Riverside (United States)
Rate constants for the gas-phase reactions of tetramethylsilane, hexamethyldisiloxane, hexamethylcyclotrisiloxane, octamethylcyclotetrasiloxane, and decamethylcyclopentasiloxane with OH and NO{sub 3} radicals and O{sub 3} have been determined at 297 {plus minus} 2 K. The rate constants obtained for these OH radical, NO{sub 3} radical, and O{sub 3} reactions (in cm{sup 3} molecule{sup {minus}1} s{sup {minus}1} units), respectively, were as follows: for tetramethylsilane, 1.00 {times} 10{sup {minus}12}, < 8 {times} 10{sup {minus}17}, and < 7 {times} 10{sup {minus}21}; for hexamethyldisiloxane, 1.38 {times} 10{sup {minus}12}, < 8 {times} 10{sup {minus}17}, and < 7 {times} 10{sup {minus}21}; for hexamethylcyclotrisiloxane, 5.2 {times} 10{sup {minus}13}, < 2 {times} 10{sup {minus}16}, and < 3 {times} 10{sup {minus}20}; for octamethylcyclotetrasiloxane, 1.01 {times} 10{sup {minus}12}, < 2 {times} 10{sup {minus}16}, and < 3 {times} 10{sup {minus}20}, and for decamethylcyclopentasiloxane, 1.55 {times} 10{sup {minus}12}, < 3 {times} 10{sup {minus}16}, and < 3 {times} 10{sup {minus}20}. The NO{sub 3} radical and O{sub 3} reactions are calculated to be of no importance as tropospheric removal processes for these compounds. The calculated lifetimes of these volatile organosilicon compounds in the troposphere due to chemical reaction with the OH radical range from {approximately}10 days for decamethylcylopentasiloxane to {approximately}30 days for hexamethycylclotrisiloxane.
- OSTI ID:
- 5019780
- Journal Information:
- Environmental Science and Technology; (United States), Journal Name: Environmental Science and Technology; (United States) Vol. 25:5; ISSN ESTHA; ISSN 0013-936X
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
540120* -- Environment
Atmospheric-- Chemicals Monitoring & Transport-- (1990-)
AMBIENT TEMPERATURE
ATMOSPHERIC CHEMISTRY
CHALCOGENIDES
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
CHEMILUMINESCENCE
CHEMISTRY
CHROMATOGRAPHY
DECOMPOSITION
ELECTROMAGNETIC RADIATION
ESTERS
FLUIDS
FLUORINATED ALIPHATIC HYDROCARBONS
GAS CHROMATOGRAPHY
GASES
HALOGENATED ALIPHATIC HYDROCARBONS
HYDRIDES
HYDROGEN COMPOUNDS
HYDROXYL RADICALS
KINETICS
LIFETIME
LUMINESCENCE
MATERIALS
NITROGEN COMPOUNDS
NITROGEN OXIDES
NITROUS ACID ESTERS
NITROXYL RADICALS
ORGANIC COMPOUNDS
ORGANIC FLUORINE COMPOUNDS
ORGANIC HALOGEN COMPOUNDS
ORGANIC SILICON COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
OZONE
PETROCHEMICALS
PETROLEUM PRODUCTS
PHOTOCHEMICAL REACTIONS
PHOTOLYSIS
PLASTICS
POLY
POLYETHYLENES
POLYTETRAFLUOROETHYLENE
RADIATIONS
RADICALS
REACTION KINETICS
SEPARATION PROCESSES
SILANES
SILICON COMPOUNDS
SILOXANES
SYNTHETIC MATERIALS
TEFLON
ULTRAVIOLET RADIATION