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Environmental fate & pathways

Hydrolysis

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Administrative data

Link to relevant study record(s)

Reference
Endpoint:
hydrolysis
Type of information:
experimental study
Adequacy of study:
key study
Study period:
1988-03-18 to 1988-03-23
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
guideline study with acceptable restrictions
Remarks:
no GLP stated
Qualifier:
according to guideline
Guideline:
OECD Guideline 111 (Hydrolysis as a Function of pH)
Deviations:
no
Qualifier:
according to guideline
Guideline:
other: EEC guideline L25/C.10
Deviations:
no
Principles of method if other than guideline:
Hydrolysis of test substance at 50 °C and pH 4, 7 and 9 for the preliminary test.
GLP compliance:
no
Radiolabelling:
no
Analytical monitoring:
yes
Details on sampling:
no data
Buffers:
- pH: 4
- Composition of buffer: 10.2 g of potassium biphthalate diluted to 1000 mL with water.

- pH: 7
- Composition of buffer: 29.0 ml of 1 N NaOH + 6.80 g of monopotassium phosphate diluted to 1000 ml with water.


- pH: 9
- Composition of buffer: 21.0 ml of 1 N NaOH + 3.08 g of boric acid + 3.72 g of KCl diluted to 1000 ml with water

Details on test conditions:
The hydrolysis was examined at three different pH values 4,7 and 9 in the dark.
- Temperature: 50 °C
- 0.050 g test substance is accurately weighed into a brown 250 mL with the buffer solutions pH 4, pH 7 and pH 9 respectively.
- The hydrolysis is carried out in a thermostatically controlled water bath.
- After reaction time, 10 mL of the test solution is neutralized and diluted with water to 50 mL.
Duration:
5 d
pH:
4
Temp.:
50 °C
Initial conc. measured:
0.202 - 0.204 g/L
Duration:
5 d
pH:
7
Temp.:
50 °C
Initial conc. measured:
0.202 - 0.203 g/L
Duration:
5 d
pH:
9
Temp.:
50 °C
Initial conc. measured:
0.201 - 0.205
Number of replicates:
2
Positive controls:
no
Negative controls:
no
Statistical methods:
NA
Preliminary study:
At 50°C the hydrolysis of test item is less than 10 % at pH 4, 7 and 9. The test item is stable at pH 4, 7 and 9 and 50°C: it has a half-life period longer than one year at 25 °C at pH 4, 7 and 9.
Test performance:
no remarks
Transformation products:
no
Details on hydrolysis and appearance of transformation product(s):
NA
% Recovery:
< 10
pH:
4
Temp.:
50 °C
Duration:
5 d
% Recovery:
< 10
pH:
7
Temp.:
50 °C
Duration:
5 d
% Recovery:
< 10
pH:
9
Temp.:
50 °C
Duration:
5 d
Key result
pH:
4
Temp.:
50 °C
Remarks on result:
hydrolytically stable based on preliminary test
Key result
pH:
7
Temp.:
50 °C
Remarks on result:
hydrolytically stable based on preliminary test
Key result
pH:
9
Temp.:
50 °C
Remarks on result:
hydrolytically stable based on preliminary test
Other kinetic parameters:
NA
Details on results:
At 50 °C the hydrolysis of the test item is less than 10 % at pH 4,7 and 9.

NA

Validity criteria fulfilled:
yes
Conclusions:
Sodium 3(2H-benzotriazol-2-yl)-5-sec-butyl-4-hydroxybenzenesulfonate is stable at pH 4,7 and 9 at 50 °C: it has a half-life period longer than one year at 25 °C at pH 4,7 and 9.
Executive summary:

The stability of sodium 3(2H-benzotriazol-2-yl)-5-sec-butyl-4-hydroxybenzenesulfonate in water was investigated according to OECD guideline 111. The hydrolysis of the test item was investigated at 50 °C and pH 4, 7 and 9 in the preliminary test. At 50°C the hydrolysis of test item was less than 10 % at pH 4, 7 and 9. The test item is thus considered stable at pH 4, 7 and 9 and 50°C with a half-life of more than 1 year at 25 °C and pH 4, 7 and 9.

Description of key information

Abiotic degradation via hydrolysis is not considered to be a relevant degradation pathway for this substance.

Key value for chemical safety assessment

Additional information

The stability of sodium 3(2H-benzotriazol-2-yl)-5-sec-butyl-4-hydroxybenzenesulfonate in water was investigated according to OECD guideline 111. The hydrolysis of the test item was investigated at 50 °C and pH 4, 7 and 9 in the preliminary test. At 50°C the hydrolysis of test item was less than 10 % at pH 4, 7 and 9. The test item is thus considered stable at pH 4, 7 and 9 and 50°C with a half-life of more than 1 year at 25 °C and pH 4, 7 and 9.