Appendix D - Dossier (PDF) - Tera

date: 20–JUL–2005
3. Environmental Fate and Pathways Substance ID: 71–43–2
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3. Pyruvic acid and biacetyl reacted only in presence of
nitrogen oxides under influence of sunlight to produce
peroxyacetylnitrate: in one run, from 0.72 ppm carbonyl
(pyruvic acid), in 4 hours, a maximum concentration of 35
ppb of peroxyacetylnitrate was formed.
The methyl group of cresol appears not to be involved in the
photochemical oxidation, so the reaction mechanism in terms
of substitution with hydroxyl and nitro groups may also be
valid for the degradation of benzene.
Source: German Rapporteur
Test condition: 1. Smog chamber containing ozone–free air were filled with
nitrogen oxides and cresol diluted with nitrogen and exposed
to sunlight in outdoor experiments for 3 – 5,5 hours.
2. Ozone, o–cresol, and nitrogen dioxide were injected into
the chamber protected against sun light and containing,
ozone–free purified air for 2 – 4 hours. Control experiments
with cresol in purified air alone or nitrogen oxides and
ozone alone in air were also performed.
3. Pyruvic acid and biacetyl alone in pure air (< 14 ppm
nitrogen oxides) in the dark or in sunlight and a mixture of
pyruvic acid or biacetyl with nitrogen oxides in sunlight
were allowed to react for 2 to 5 hours to produce
peroxyacetylnitrate.
Test substance: No data
Flag: Risk Assessment
16–MAR–2004 (449)
Memo: Ring–fission products of o–cresol as primary oxidation product
of toluene in analogy to benzene.
Method: Smog chamber experiments: sunlight irradiation on a 4 or 60
cu m chamber covered with Teflon film.
Remark: Used for Risk Assessment.
Result: In an experiment with a 60 cu m chamber running for 5.5
hours containing initial concentrations of 0.36 ppm nitrogen
monoxide, 0.30 ppm nitrogen dioxide and 0.70 ppm o–cresol,
the following products were observed: 156 ppm ozone (after
5.5 hours), 7 ppb peroxyacetylnitrate, formaldehyde (31 ppb
after 2 h, 47 ppb after 4 h), acetaldehyde (17 ppb after 2
h, 15 ppb after 4 h), pyruvic acid (not quantified), and
particulate matter (460 µg/m**3) consisting of
hydroxynitrotoluenes, hydroxydinitotoluenes, and
dihydroxynitrotoluenes.
The methyl group of cresol appears not to be involved in the
photochemical oxidation, so the reaction mechanism in terms
of substitution with hydroxyl and nitro groups may also be
valid for the degradation of benzene.
Source: German Rapporteur
Test condition: Smog chamber containing ozone–free air were filled with
nitrogen oxides and cresol diluted with nitrogen and exposed
to sunlight in outdoor experiments for 3 – 6 hours.
Test substance: No data
Flag: Risk Assessment
16–OCT–2002 (448)
Appendix D: Benzene SIDS Dossier
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