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Environmental fate & pathways

Hydrolysis

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Reference
Endpoint:
hydrolysis
Type of information:
experimental study
Adequacy of study:
supporting study
Study period:
No data
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
comparable to guideline study with acceptable restrictions
Remarks:
This study was not performed according to GLP. However, this study is well documented and is considered reliable with restrictions.
Qualifier:
equivalent or similar to
Guideline:
OECD Guideline 111 (Hydrolysis as a Function of pH)
Version / remarks:
13 April 2004
Deviations:
no
Principles of method if other than guideline:
The aim of the study is to assess the stability of the substance in a series of simple media simulating perfumery applications. The test media are standard aqueous buffers at pH 2, pH 5, pH 7, pH 8.5 and pH 12 containing 1% of non ionic surfactant. The tests are done in accelerated conditions at 40 °C during ca. one month.
GLP compliance:
no
Specific details on test material used for the study:
No additional information
Radiolabelling:
no
Analytical monitoring:
yes
Details on sampling:
200 – 300 ppm of raw material are dissolved in the pH buffer containing the surfactant (Arkopal N 150) and put into storage in an oven at 40°C. Small aliquots of the test solution are extracted with an organic solvent (typically cyclohexane or ethyl acetate) containing a hydrocarbon standard (typically C12, C17 or C20) on a regular basis throughout the test (typically at time = 0, 1, 2, 4, 7, 15, 21 and 28 days). The extracts are analyzed by GC-FID and the results are plotted as (Area/Area Std) expressed in [%]. The measurement at time = 0 is set at 100% and the succeeding measurements are calculated relatively to the time = 0 measurement. Therefore the curves represent the percentage of product remaining in the test solution at the time of analysis.
Buffers:
Buffer solutions:
pH 2 (± 0.1) buffer: Reference Handbook of Chemistry and Physics buffer type A
pH 5 (± 0.1) buffer: Reference Handbook of Chemistry and Physics buffer type C
pH 7 (± 0.1) buffer: Reference Handbook of Chemistry and Physics buffer type D
pH 8.5 (± 0.1) buffer: Reference Handbook of Chemistry and Physics buffer type F
pH 12 (± 0.1) buffer: Reference Handbook of Chemistry and Physics buffer type I
Estimation method (if used):
Not applicable
Details on test conditions:
No data
Duration:
28 d
pH:
2
Temp.:
40 °C
Initial conc. measured:
> 200 - < 300 other: ppm
Duration:
28 d
pH:
5
Temp.:
40 °C
Initial conc. measured:
> 200 - < 300 other: ppm
Duration:
28 d
pH:
7
Temp.:
40 °C
Initial conc. measured:
> 200 - < 300 other: ppm
Duration:
28 d
pH:
8.5
Temp.:
40 °C
Initial conc. measured:
> 200 - < 300 other: ppm
Duration:
28 d
pH:
12
Temp.:
40 °C
Initial conc. measured:
> 200 - < 300 other: ppm
Number of replicates:
1
Positive controls:
no
Negative controls:
no
Statistical methods:
None
Preliminary study:
No data
Test performance:
No data
Transformation products:
no
Details on hydrolysis and appearance of transformation product(s):
Results showed that the disappearance of the parent compound after 2 and 28 days at 40 °C and at any pH (from 7 to 12) is less than 10 %. At lowest pH (pH2 and 5), the parent compound rapidly disappears as of day 1 and 2 for pH 2 and 5, respectively .
% Recovery:
0
pH:
2
Temp.:
40 °C
Duration:
1 d
% Recovery:
0
pH:
2
Temp.:
40 °C
Duration:
28 d
% Recovery:
ca. 100
pH:
5
Temp.:
40 °C
Duration:
1 d
% Recovery:
ca. 95
pH:
5
Temp.:
40 °C
Duration:
2 d
% Recovery:
ca. 80
pH:
5
Temp.:
40 °C
Duration:
5 d
% Recovery:
ca. 45
pH:
5
Temp.:
40 °C
Duration:
15 d
% Recovery:
ca. 25
pH:
5
Temp.:
40 °C
Duration:
28 d
% Recovery:
ca. 100
pH:
7
Temp.:
40 °C
Duration:
1 d
% Recovery:
ca. 100
pH:
7
Temp.:
40 °C
Duration:
28 d
% Recovery:
ca. 100
pH:
8.5
Temp.:
40 °C
Duration:
1 d
% Recovery:
ca. 100
pH:
8.5
Temp.:
40 °C
Duration:
ca. 28 d
% Recovery:
ca. 100
pH:
12
Temp.:
40 °C
Duration:
28 d
Other kinetic parameters:
None
Details on results:
No additional information
Results with reference substance:
None
Validity criteria fulfilled:
not applicable
Conclusions:
The test substance is hydrolytically stable at pH neutral, but unstable to very untable at pH 5 and 2, as defined in the OECD TG 111 for hydrolysis as a function of pH. No half-life values were determined.
Executive summary:

Hydrolysis study was performed similar to OECD Guideline No. 111. The aim of the study is to assess the stability of the substance in a series of simple media simulating perfumery applications. The test media are standard aqueous buffers at pH 2, pH 5, pH 7, pH 8.5 and pH 12 containing 1% of non ionic surfactant (Arkopal N 150). The tests are done in accelerated conditions at 40 °C during 28 days.

200 – 300 ppm of raw material are dissolved in the pH buffer containing the surfactant (Arkopal N 150) and put into storage in an oven at 40°C. Small aliquots of the test solution are extracted with an organic solvent (typically cyclohexane or ethyl acetate) containing a hydrocarbon standard (typically C12, C17 or C20) on a regular basis throughout the test (typically at time = 0, 1, 2, 4, 7, 15, 21 and 28 days). The extracts are analyzed by GC-FID and the results are plotted as (Area/Area Std) expressed in [%]. The measurement at time = 0 is set at 100% and the succeeding measurements are calculated relatively to the time = 0 measurement. Therefore the curves represent the percentage of product remaining in the test solution at the time of analysis.

 

The test substance is stable up to 28 days at neutral and basic pH (from 7 to 12). At pH 5 and 40°C, the decrease after 28 days is steady to reach ca. 75% decrease. On the contrary at pH 2, there is immediate and almost total disappearance of the test substance. Therefore, it can be concluded that under the conditions of the present test, the test substance is hydrolytically stable at pH neutral, but unstable to very untable at pH 5 and 2, as defined in the OECD TG 111 for hydrolysis as a function of pH.

Description of key information

Data waiver

Key value for chemical safety assessment

Additional information

To assess the hydrolysis potential of the registered substance, a non-GLP stability test was performed on this substance with a method similar to OECD Guideline No. 111. The test media are standard aqueous buffers at pH 2, pH 5, pH 7, pH 8.5 and pH 12 containing 1% of non ionic surfactant (Arkopal N 150). The test is done in accelerated conditions at 40 °C during 28 days. The test substance is stable up to 28 days at neutral and basic pH (from 7 to 12). At pH 5 and 40°C, the decrease after 28 days is steady to reach ca. 75% decrease. On the contrary, at pH 2, there is immediate and almost total disappearance of the test substance. Therefore, it can be concluded that under the conditions of the present test, the registered substance is hydrolytically stable at pH neutral, but unstable to very unstable at pH 5 and 2.

However, as the registered substance is readily biodegradable, a GLP hydrolysis study does not need to be conducted, in accordance with REACH Annex VIII column 2. In conclusion, a data waiving is proposed to cover the hydrolysis endpoint of the registered substance and the non-GLP stability test is mentioned in the dossier as a supporting study (this data, performed internally by the lead registrant, cannot be used as a key or weight of evidence study because the test was performed after REACH came into force).