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Environmental fate & pathways

Hydrolysis

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Administrative data

Endpoint:
hydrolysis
Type of information:
experimental study
Adequacy of study:
key study
Study period:
21-11-2012 - 31-05-2013
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study

Data source

Reference
Reference Type:
study report
Title:
Unnamed
Year:
2013
Report Date:
2013

Materials and methods

Test guideline
Qualifier:
according to
Guideline:
OECD Guideline 111 (Hydrolysis as a Function of pH)
GLP compliance:
yes (incl. certificate)

Test material

Reference
Name:
Unnamed
Type:
Constituent
Test material form:
other: 51 % w/w solution in water, stabilized with X % NaOH
Details on test material:
- Substance type: Liquid
- Physical state: Light brown liquid
Specific details on test material used for the study:
PHYSICO-CHEMICAL PROPERTIES
- Boiling point: 107 °C
- Water solubility (under test conditions): > 1000 g/L
- pH 12-14
The production method yields the substance in an approximately 50% aqueous solution with a content of sodium hydroxide.

Study design

Analytical monitoring:
yes
Buffers:
- pH: 4, 7, 9
- Composition of buffer: (Concentration in mmol dm-3)
4: Citric acid 0.6; Sodium chloride 0.4; Sodium hydroxide 0.7
7: Disodium hydrogen orthophosphate (anhydrous) 0.3; Potassium dihydrogen orthophosphate 0.2; Sodium chloride 0.2
9: Disodium tetraborate 0.1; sodium chloride 0.2
Duration of testopen allclose all
Duration:
120 h
pH:
4
Temp.:
50 °C
Initial conc. measured:
> 0.001 - < 0.001 g/L
Duration:
120 h
pH:
7
Temp.:
50 °C
Initial conc. measured:
> 0.001 - < 0.001 g/L
Duration:
120 h
pH:
9
Temp.:
50 °C
Initial conc. measured:
> 0.001 - < 0.001 g/L
Number of replicates:
2 replicates pr pH value
Positive controls:
not specified
Negative controls:
not specified

Results and discussion

Transformation products:
no
Total recovery of test substance (in %)open allclose all
% Recovery:
> 96.4 - < 101
pH:
4
Temp.:
50 °C
Duration:
120 h
% Recovery:
> 94 - < 98.6
pH:
7
Temp.:
50 °C
Duration:
120 h
% Recovery:
> 103 - <= 104
pH:
9
Temp.:
50 °C
Duration:
120 h
Dissipation DT50 of parent compoundopen allclose all
Key result
pH:
4
Temp.:
25 °C
DT50:
> 1 yr
Type:
not specified
Remarks on result:
other: Estimated from results at 50°C
Key result
pH:
7
Temp.:
25 °C
DT50:
> 1 yr
Type:
not specified
Remarks on result:
other: Estimated from results at 50°C
Key result
pH:
9
Temp.:
25 °C
DT50:
> 1 yr
Type:
not specified
Remarks on result:
other: Estimated from results at 50°C

Applicant's summary and conclusion

Validity criteria fulfilled:
yes
Remarks:
For all: Linearity of detector response/concentration in the range of 0.10-1.0 mg/L. For pH: second-order behavier. At pH 7 & 9: First-order behavior with correlation coefficents (r2) ≥ 0.998
Conclusions:
The test item was found not to hydrolyse neither at pH 4; 7 nor 9. The half-life is expected to be greater than 1 year at 25 ºC.
Remark: the test solution contains NaOH due to the production method.