Registration Dossier
Registration Dossier
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EC number: 200-662-2 | CAS number: 67-64-1
Phototransformation in air
Administrative data
Link to relevant study record(s)
Description of key information
There are two reliable experimental studies for photo degradation in air. The overall loss rate of acetone including photo dissociation and loss by reaction with OH radicals and the corresponding lifetimes were calculated for January, Equinox and July at 40
degree northern latitude. Lifetimes were 18.6 - 114.4 days. This is in accordance with the findings of the second study. The photo dissociation lifetime for 40°solar angle is 1/kdissoc = 14.8 days.
Key value for chemical safety assessment
Additional information
Photolysis life times were determined for 18.6 – 114.4 days and 14.8 days in two reliable studies, respectively. The first study was performed in the presence of NO2. The degradation products of acetone after irradiation at 250 - 330 nm were carbon dioxide, carbon monoxide, and peroxyacetyl nitrate (PAN) as well. PAN was formed by reaction with NO2. Acetone losses by excited triplet acetone with O2 are not taken into account. Therefore the life times of 18.6 – 114.4 days should be regarded as upper limits.
Degradation products of acetone by photolysis at wavelength 270 – 299 nm in the second study were carbon dioxide, carbon monoxide, methanol, and formaldehyde. The estimated apparent first-order photochemical decay constants for acetone in the troposphere are much smaller than those of formaldehyde and methanol.
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