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Hydrolysis

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Reference
Endpoint:
hydrolysis
Type of information:
experimental study
Adequacy of study:
key study
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
other: Performed to adpated guidelines at a non-GLP facility.
Qualifier:
according to guideline
Guideline:
OECD Guideline 111 (Hydrolysis as a Function of pH)
Deviations:
yes
Remarks:
Due to almost instant degradation
Principles of method if other than guideline:
Initial observations showed rapid degradation in minutes in diluted form.
Only performed at 'natural' pH; it is known that pH does not influence the rate of degradation of these highly unstable substances
GLP compliance:
no
Remarks:
The hydrolysis rate is too fast and rigorous guideline test is not possible.
Specific details on test material used for the study:
SOURCE OF TEST MATERIAL
- Supplier: Borica Co., Ltd.
- Lot number: 110422Y
- Expiration date of the lot/batch: 2017-Dec-12
- CAS number: 101033-44-7

Radiolabelling:
no
Analytical monitoring:
yes
Duration:
30 min
pH:
7
Temp.:
30 °C
Number of replicates:
2
Positive controls:
no
Negative controls:
no
Preliminary study:
The diluent could be further diluted till 1:1000 in DI water and the appearance observed become cloudy in 30 minutes. The observation was done in duplicate to confirm the hydrolysis status.
Transformation products:
yes
No.:
#1
No.:
#2
No.:
#3
Details on hydrolysis and appearance of transformation product(s):
Cloudy appearance on dilution in DI water as zirconium dixoide precipitated out.
1-propanol was considered the impurity of the starting material.
Key result
pH:
7
Temp.:
30 °C
DT50:
< 30 min
Validity criteria fulfilled:
yes
Conclusions:
Although stabilised formulations can be used (eg in emulsion paint systems), when diluted further in water or if in biological systems will quickly degrade to starting materials.
The recorded degradation products are zirconium dioxide, 2,2',2''-Nitrilotriethanol (triethanolamine), and trace 1-propanol as residula impurities. The organic products are known to biodegrade readily.

Description of key information

Study following OECD guideline 111 with deviation due to rapid hydrolysis.

Key value for chemical safety assessment

Half-life for hydrolysis:
30 min
at the temperature of:
30 °C

Additional information

Degrades rapidly when diluted in water, with the visible formation of zirconium oxide as a precipitate within minutes of adding to water.  

Half-life not possible to measure, but considered to be less than 30 minutes.

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