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Environmental fate & pathways

Hydrolysis

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Reference
Endpoint:
hydrolysis
Type of information:
experimental study
Adequacy of study:
key study
Study period:
05/2012
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
guideline study with acceptable restrictions
Remarks:
This study has been carried out to OECD guideline 111. Certain test parameters were not met (sterility, temperature variation), however, this is considered to be of little significance to the result. As such, the study is considered Klimisch 2, reliable with restriction.
Qualifier:
according to guideline
Guideline:
OECD Guideline 111 (Hydrolysis as a Function of pH)
Deviations:
yes
Remarks:
Certain test parameters were not met (sterility, temperature variation), however, this is considered to be of little significance to the result.
GLP compliance:
no
Remarks:
This study was conducted in house at Perstorp AB analytical chemistry, R&D
Analytical monitoring:
yes
Details on sampling:
Samples were taken for all mixtures after five days
Buffers:
Buffer solutions were store bought from Merck. All water used in buffers was of grade 1. Buffer solutions were as follows:
pH 4 buffer: pH 4±0.01 (20oC) (citric acid/sodium hydroxide/hydrogen chloride)
pH 7 buffer: pH 7±0.01 (20oC) (di-sodium hydrogen phosphate/potassium di-hydrogen phosphate)
pH 9 buffer: pH 9±0.01 (20oC) (boric acid/ potassium chloride/ sodium hydrogen)
Details on test conditions:
See methods below
Number of replicates:
No information provided
Positive controls:
not specified
Negative controls:
not specified
Statistical methods:
No information provided
Preliminary study:
No information provided
Test performance:
The repeatability and sensitivity of the method was not validated, but it is considered to fulfil the demands regarding repeatability and sensitivity stated in OECD guideline 111.
Transformation products:
not measured
Details on hydrolysis and appearance of transformation product(s):
Not applicable
% Recovery:
98
Temp.:
50 °C
Duration:
5 d
Key result
Remarks on result:
not determinable
Remarks:
Hydrolysis of 3-ethyloxetane-3-methanol was found to be less than 10%.
Details on results:
Results indicated that hydrolysis was low or non-existant in all test solutions (greatest change -2.5%) the greatest observed loss of test substance was at pH 4. Overall recovery at the end of the test was 98%.

Table 1: Results weigh-in 1

  3-ethyloxetane-3-methanol : -20oC(mg/ml)  3-ethyloxetane-3-methanol: 50oC (mg/ml)   Change (%)
pH 4 buffer  0.351  0.346  -1.42 
pH 7 buffer   0.354  0.355 0.28 
 pH 9 buffer  0.354 0.354  0.00 

Table 2: Results weigh-in 2

   3-ethyloxetane-3-methanol : -20oC(mg/ml)   3-ethyloxetane-3-methanol: 50oC (mg/ml)  Change (%) 
 pH 4 buffer  0.341  0.334  -2.05
 pH 7 buffer  0.342 0.341  -0.29
pH 9 buffer  0.341  0.343  0.59

Table 3: pH at weigh-in 1

   pH start  pH 50oCafter 5 days  pH -20oCafter 5 days
 pH 4 buffer  4.1 4.0  4.0
 pH 7 buffer 7.1   7.1  7.1
 pH 9 buffer  9.1  9.0 9.0 

Table 4: pH at weigh-in 2

   pH start  pH 50oC after 5 days  pH -20oC after 5 days
 pH 4 buffer  4.1 4.0  4.0 
 pH 7 buffer  7.1 7.1   7.1
 pH 9 buffer  9.1 9.0   9.0
Validity criteria fulfilled:
not specified
Conclusions:
Hydrolysis of 3-ethyloxetane-3-methanol was found to be less than 10% and therefore there is no need for further hydrolysis tests.
Executive summary:

A study was conducted to assess hydrolysis as a function of pH for 3-ethyoxetane-3-methanol. The pH buffers used were pH 4.0, 7.0 and 9.0. Half of the mixture was stored in a heating cabinet for five days, while the other half was stored at -20oC to act as a reference. After five days mixtures were analysed using HPLC. Results indicated low hydrolytic activity at 50oC, with 98% of the test substance being recovered. As hydrolysis of of 3-ethyloxetane-3-methanol was found to be less than 10% and therefore there is no need for further hydrolysis tests.

Description of key information

Results indicate low hydrolytic activity with 98% of the test substance recovered after 5days at 50oC.

Key value for chemical safety assessment

Additional information

An OECD 111 study was conducted to assess hydrolysis as a function of pH for 3-ethyloxetane-3-methanol (TMPO). The pH buffers used were pH 4.0, 7.0 and 9.0. Half of the mixture was stored in a heating cabinet for five days, while the other half was stored at -20oC to act as a reference. After five days mixtures were analysed using HPLC. Results indicated low hydrolytic activity at 50 oC, with 98% of the test substance being recovered. As hydrolysis of 3-ethyloxetane-3-methanol was found to be less than 10% and therefore there is no need for further hydrolysis tests.