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EC number: 291-454-0
CAS number: 90411-76-0
Hydrolysis of the substance is not expected, based on the absence of
hydrolysable functional groups.
The stability of the substance in different aqueous test solutions
towards photolysis was investigated. The experiments were carried out at
two concentrations in deionised water and in an algae nutrient medium.
Conditions for radiation, ventilation and nutrient medium corresponding
those conditions used in ecotox testing in accordance with Commission
Regulation (EC) No 761/2009 amending Regulation No 440/2008, Method C.3
‘Freshwater Alga and Cyanobacteria, Growth inhibition test’ (2009) which
is equivalent to OECD Guideline for Testing of Chemicals No. 201 (2006)
‘Alga, Growth Inhibition Test’. Under the same conditions, but in the
dark, test solutions at the same concentrations were performed to serve
as controls. Degradation was followed via HPLC analysis.
In deionised water the half-life times were 9.2 days at 10 mg/L and 9.6
days at 32 mg/L, and in OECD nutrient medium a half-life time of 3.2
days at 10 mg/L and 7.7 days at 32 mg/L was obtained. The longer
half-life time obtained in the tests at the concentration of 32 mg/l in
the presence of light may be due to hindered radiation of the molecules
of the substance, as the solution was dark coloured. The results of the
test series conducted in the dark show stability of the test substance
under exposure conditions. It is clearly demonstrated, that the
susbtance is rapidly degradable by photolysis. As no additional peaks
are shown in the chromatograms transformation products were not detected
via HPLC. Due to the complex nature of photochemical processes with a
large number of possible transformation pathways, and sub-sequent
reactions of produced intermediate species, confirms the difficulty on
identification of transformation products.
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