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Environmental fate & pathways

Hydrolysis

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Reference
Endpoint:
hydrolysis
Type of information:
read-across from supporting substance (structural analogue or surrogate)
Adequacy of study:
weight of evidence
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
data from handbook or collection of data
Remarks:
experimental data of read across substances
Justification for type of information:
Data for the target chemical is summarized based on the structurally similar read across chemicals
Reason / purpose:
read-across source
Reason / purpose:
read-across source
Qualifier:
according to
Guideline:
other: as mentioned below
Principles of method if other than guideline:
WoE report is based on two hydrolysis studies as- 1. and 2.
GLP compliance:
not specified
Radiolabelling:
not specified
Analytical monitoring:
not specified
Estimation method (if used):
Structure estimation method
Positive controls:
not specified
Negative controls:
not specified
Transformation products:
not specified
pH:
7
DT50:
3.3 yr
Type:
second order
Remarks on result:
other: 1) Hydrolysis rate constant is 0.063 L/mol-sec.
pH:
8
DT50:
121 d
Type:
second order
Remarks on result:
other: 1) Hydrolysis rate constant is 0.063 L/mol-sec.
pH:
7
DT50:
2.1 yr
Type:
second order
Remarks on result:
other: 2) Hydrolysis rate constant is 0.10 L/mol-sec
pH:
8
DT50:
78 d
Type:
second order
Remarks on result:
other: 2) Hydrolysis rate constant is 0.10 L/mol-sec
Validity criteria fulfilled:
not specified
Conclusions:
On the basis of the experimental studies of the structurally and functionally similar read across chemical and applying the weight of evidence approach, the hydrolysis half-life value of the test chemical can be expected to be 3.3 yrs & 121 days with a hydrolysis rate constant of 0.063L/mol-sec or 2.1 yrs & 78 days with a hydrolysis rate constant of 0.10L/mol-sec at pH 7 and 8, respectively. Thus, based on this half-life value, it can be concluded that the test chemical can be expected to be not hydrolysable.
Executive summary:

Data available for the structurally and functionally similar read across chemicals has been reviewed to determine the half-life of the test chemical. The studies are as mentioned below:

The half-life and base catalyzed second order hydrolysis rate constant was determined using a structure estimation method of the test chemical. The second order hydrolysis rate constant of test substance was determined to be 0.063L/mol-sec with a corresponding half-lives of 3.3 yrs and 121 days at pH 7 and 8, respectively. Based on the half-life values, it is concluded that test chemical is not hydrolysable.

In an another study, the half-life and base catalyzed second order hydrolysis rate constant was determined using a structure estimation method of the test chemical. The second order hydrolysis rate constant of test substance was determined to be 0.10L/mol-sec with a corresponding half-lives of 2.1 yrs and 78 days at pH 7 and 8, respectively. Based on the half-life values, it is concluded that test chemical is not hydrolysable.

On the basis of the experimental studies of the structurally and functionally similar read across chemical and applying the weight of evidence approach, the hydrolysis half-life value of the test chemical can be expected to be 3.3 yrs & 121 days with a hydrolysis rate constant of 0.063L/mol-sec or 2.1 yrs & 78 days with a hydrolysis rate constant of 0.10L/mol-sec at pH 7 and 8, respectively. Thus, based on this half-life value, it can be concluded that the test chemical can be expected to be not hydrolysable.

Description of key information

On the basis of the experimental studies of the structurally and functionally similar read across chemical and applying the weight of evidence approach, the hydrolysis half-life value of the test chemical can be expected to be 3.3 yrs & 121 days with a hydrolysis rate constant of 0.063L/mol-sec or 2.1 yrs & 78 days with a hydrolysis rate constant of 0.10L/mol-sec at pH 7 and 8, respectively. Thus, based on this half-life value, it can be concluded that the test chemical can be expected to be not hydrolysable.

Key value for chemical safety assessment

Additional information

Data available for the structurally and functionally similar read across chemicals has been reviewed to determine the half-life of the test chemical. The studies are as mentioned below:

The half-life and base catalyzed second order hydrolysis rate constant was determined using a structure estimation method of the test chemical. The second order hydrolysis rate constant of test substance was determined to be 0.063L/mol-sec with a corresponding half-lives of 3.3 yrs and 121 days at pH 7 and 8, respectively. Based on the half-life values, it is concluded that test chemical is not hydrolysable.

In an another study, the half-life and base catalyzed second order hydrolysis rate constant was determined using a structure estimation method of the test chemical. The second order hydrolysis rate constant of test substance was determined to be 0.10L/mol-sec with a corresponding half-lives of 2.1 yrs and 78 days at pH 7 and 8, respectively. Based on the half-life values, it is concluded that test chemical is not hydrolysable.

On the basis of the experimental studies of the structurally and functionally similar read across chemical and applying the weight of evidence approach, the hydrolysis half-life value of the test chemical can be expected to be 3.3 yrs & 121 days with a hydrolysis rate constant of 0.063L/mol-sec or 2.1 yrs & 78 days with a hydrolysis rate constant of 0.10L/mol-sec at pH 7 and 8, respectively. Thus, based on this half-life value, it can be concluded that the test chemical can be expected to be not hydrolysable.