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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
Specific details on test material used for the study:
- Name of test material (IUPAC Name): 1,4-Bis(ethenyl)benzene- Molecular formula: C10H10- Molecular weight: 130.189 g/mol- Smiles notation: C(c1ccc(cc1)C=C)=C- InChI: 1S/C10H10/c1-3-9-5-7-10(4-2)8-6-9/h3-8H,1-2H2 - Substance type: Organic- Physical state: Solid
Radiolabelling:
not specified
Analytical monitoring:
not specified
Duration:
5 d
Temp.:
50 °C
Remarks:
(1) The study was performed at a pH range 4, 7 and 9, respectively.
Duration:
30 d
Temp.:
15 °C
Initial conc. measured:
1 mg/L
Remarks:
(2) The study was performed at a pH range 4, 7 and 9, respectively.
Duration:
30 d
Temp.:
25 °C
Initial conc. measured:
1 mg/L
Remarks:
(2) The study was performed at a pH range 4, 7 and 9, respectively.
Number of replicates:
1. Not specified2. Single sample at 15 °C, duplicate samples at 25 °C
Positive controls:
not specified
Negative controls:
not specified
Transformation products:
not specified
Temp.:
50 °C
DT50:
> 5 d
Remarks on result:
other: The study was performed at a pH range 4, 7 and 9, respectively. No hydrolysis was noted at any of the three levels of pH tested.
pH:
4
Temp.:
15 °C
Remarks on result:
other: No hydrolysis of test chemical was noted.
pH:
7
Temp.:
15 °C
Remarks on result:
other: No hydrolysis of test chemical was noted.
pH:
9
Temp.:
15 °C
DT50:
177 d
Remarks on result:
other: Other details not known
pH:
4
Temp.:
25 °C
DT50:
> 37 - < 50 d
Remarks on result:
other: Other details not known
pH:
7
Temp.:
25 °C
DT50:
> 39 - < 59 d
Remarks on result:
other: Other details not known
pH:
9
Temp.:
25 °C
DT50:
> 49 - < 52 d
Remarks on result:
other: Other details not known
Details on results:
1. Test chemical was reported to be hydrolytically stable at pH 4, 7 and 9, respectively at a temperature of 50⁰C for 5 days. 2. Test chemical was reported to be hydrolytically stable at pH 4, 7 and 9, respectively at a temperature of 15 and 25⁰C.
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 1,4-Bis(ethenyl)benzene can be expected to be > 5 days at pH 4, 7 and 9 & at a temperature of 50⁰C or 37-50, 39-59 and 49-52 days at pH 4, 7 and 9 at 25°C, respectively.Thus, based on this half-life value, it can be concluded that the test chemical 1,4-Bis(ethenyl)benzene is 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 1,4-Bis(ethenyl)benzene.The studies are as mentioned below:

The half-life of the test chemical was determined at different pH range. The study was performed according to OECD Guideline 111 (Hydrolysis as a Function of pH) at a temperature of 50°C and pH of 4, 7 and 9, respectively. No hydrolysis was noted at any of the three levels of pH tested and thus was reported to be hydrolytically stable at pH 4, 7 and 9, respectively at a temperature of 50⁰C for 5 days. The half-life value of test chemical was determined to be > 5 daysat pH 4, 7 and 9, respectively & at a temperature of 50⁰C. Thus based on this, test chemical is considered to be not hydrolysable.

The half-life of the test chemical was determined at different pH range. The study was performed according to OECD Guideline 111 (Hydrolysis as a Function of pH). A preliminary test was conducted with fortified samples in pH 4, 7 and 9 buffer solutions over a five–day period at 50 +/- 1°C.The definitive test was conducted with fortified samples in pH 4, 7 and 9 buffer solutions maintained at 15 and 25°C.Samples were subjected to seven sampling intervals over a 30-day period. Samples incubated at 15°C were collected on Day 0. Thereafter samples were collected on Days 2, 3, 10, 25 and 30. Samples incubated at 25°C were collected at Days 0, 2, 3, 10, 17 and 30. Duplicate samples were analyzed at each interval for the 25 degree test, while single samples were analyzed from the 15 degrees C test.Each of the constituents of test chemical were analyzed to determine the test substance concentration in the samples.The half-life value of test chemical at temperature of 15°C was not known, but was reported to be hydrolytically stable at pH 4, 7 and 9, respectively at a temperature of 15 whereas at temperature of 25°C, the half-life value of test chemical was determined to be ranges from 37-50, 39-59 and 49-52 days atpH 4, 7 and 9, respectively.Thus based on this, test chemical is considered to be 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 1,4-Bis(ethenyl)benzene can be expected to be > 5 days at pH 4, 7 and 9 & at a temperature of 50⁰C or 37-50, 39-59 and 49-52 days at pH 4, 7 and 9 at 25°C, respectively. Thus, based on this half-life value, it can be concluded that the test chemical 1,4-Bis(ethenyl)benzene is 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 1,4-Bis(ethenyl)benzene can be expected to be > 5 days at pH 4, 7 and 9 & at a temperature of 50⁰C or 37-50, 39-59 and 49-52 days at pH 4, 7 and 9 at 25°C, respectively.Thus, based on this half-life value, it can be concluded that the test chemical 1,4-Bis(ethenyl)benzene is 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 1,4-Bis(ethenyl)benzene. The studies are as mentioned below:

 

The half-life of the test chemical was determined at different pH range. The study was performed according to OECD Guideline 111 (Hydrolysis as a Function of pH) at a temperature of 50°C and pH of 4, 7 and 9, respectively. No hydrolysis was noted at any of the three levels of pH tested and thus was reported to be hydrolytically stable at pH 4, 7 and 9, respectively at a temperature of 50⁰C for 5 days. The half-life value of test chemical was determined to be > 5 days at pH 4, 7 and 9, respectively & at a temperature of 50⁰C. Thus based on this, test chemical is considered to be not hydrolysable.

 

The half-life of the test chemical was determined at different pH range. The study was performed according to OECD Guideline 111 (Hydrolysis as a Function of pH). A preliminary test was conducted with fortified samples in pH 4, 7 and 9 buffer solutions over a five–day period at 50 +/- 1°C.The definitive test was conducted with fortified samples in pH 4, 7 and 9 buffer solutions maintained at 15 and 25°C.Samples were subjected to seven sampling intervals over a 30-day period. Samples incubated at 15°C were collected on Day 0. Thereafter samples were collected on Days 2, 3, 10, 25 and 30. Samples incubated at 25°C were collected at Days 0, 2, 3, 10, 17 and 30. Duplicate samples were analyzed at each interval for the 25 degree test, while single samples were analyzed from the 15 degrees C test. Each of the constituents of test chemical were analyzed to determine the test substance concentration in the samples.The half-life value of test chemical at temperature of 15°C was not known, but was reported to be hydrolytically stable at pH 4, 7 and 9, respectively at a temperature of 15 whereas at temperature of 25°C, the half-life value of test chemical was determined to be ranges from 37-50, 39-59 and 49-52 days at pH 4, 7 and 9, respectively. Thus based on this, test chemical is considered to be 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 1,4-Bis(ethenyl)benzene can be expected to be > 5 days at pH 4, 7 and 9 & at a temperature of 50⁰C or 37-50, 39-59 and 49-52 days at pH 4, 7 and 9 at 25°C, respectively. Thus, based on this half-life value, it can be concluded that the test chemical 1,4-Bis(ethenyl)benzene is not hydrolysable.