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EC number: 277-873-1
CAS number: 74441-05-7
Results of preliminary test:
TestedpHat50 deg C
pH-valueat 25 deg C
< 1 mg/I
degradation <10% (5 days)
concentration at 10%
degradation = 15.8 mg/L
degradation = 14.3 mg/L
degradation = 13.1 mg/L
The abiotic degradation of the submission
substance was determined according to EU method C.7 and in accordance
with OECD-Guideline 111.
The rate of degradation was measured at
three different pH-values (4, 7, and 9). At all tested pH values the
test substance was stable, this means that the degradation was less than
10 % after 5 days at 50°C. Therefore no further testing was necessary
according to the guidelines mentioned above.
Because the test substance is nearly
insoluble in aqueous solutions and in common organic solvents, it was
impossible to prepare defined solutions. Therefore suspensions of the
test substance in the single buffer solutions with a nominal
concentration of approximately 2 g/L (4 mmol/L) were prepared.
Due to the test substance properties no
analytical method was available for the direct determination of the
pigment concentration. Therefore the observation of the degradation
progress was achieved by determination of the concentration of methanol,
which is the predicted degradation product (ester hydrolysis)
The test suspensions were incubated at 50°C
over a period of 217.5 hours (approx. 9 days). Samples were taken from
time to time and the methanol concentration was determined by
All analyzed samples had a methanol
concentration below 1 mg/L. This corresponds with a degree of hydrolysis
Summing up, the measured results showed that
the submission substance is hydrolytically stable at the tested
pH-values 4, 7 and 9.
No further testing according to the
mentioned guidelines has to be performed.
A hydrolysis study according to OECD 111 was performed with C.I. Pigment Yellow 175, which exhibits the highest water solubility within the group of the Acetolone pigments. In addition, there are functional groups present in the molecule of PY 175, which can be hydrolyzed from a theoretical point of view. PY 175 was stable at all tested pH values
Read-across to PY 181 nanoform is justified since the water solubility is much lower and there are no ester functions present in the molecule.
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