Registration Dossier

Administrative data

Endpoint:
hydrolysis
Type of information:
migrated information: read-across based on grouping of substances (category approach)
Adequacy of study:
weight of evidence
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
other: Well investigated chemical information.

Data source

Reference
Reference Type:
review article or handbook
Title:
General and Inorganic Chemistry.
Author:
Hägg G
Year:
1969
Bibliographic source:
Wiley, New York, USA, 814 pp.

Materials and methods

Test guideline
Qualifier:
no guideline followed
Principles of method if other than guideline:
Basic chemical research.
GLP compliance:
not specified

Test material

Reference
Name:
Unnamed
Type:
Constituent
Details on test material:
not clear which test substance was used (a sulfide compound)
Specific details on test material used for the study:
Details on properties of test surrogate or analogue material (migrated information):
no details reported

Study design

Analytical monitoring:
yes
Details on sampling:
no data
Buffers:
no data
Estimation method (if used):
no data
Details on test conditions:
no data
Number of replicates:
no data
Statistical methods:
no data

Results and discussion

Preliminary study:
no data
Test performance:
no data
Details on hydrolysis and appearance of transformation product(s):
Na2S + H2S --> NaHS + NaOH
NaHS + H2O --> NaOH + H2S
H2S is an extremely toxic gas that can stay present in water for several hours, depending on the oxygen level of the environment under consideration. In oxic systems, oxidation to - eventually - sulfate will occur.
Other kinetic parameters:
no data
Details on results:
no data

Applicant's summary and conclusion

Conclusions:
In aqueous environments, Na2S and NaHS are hydrolyzed and, as a function of pH, an equilibrium is established between S2-, HS-, and H2S, with increasing H2S formation with decreasing pH. H2S is an extremely toxic gas that can stay present in water for several hours, depending on the oxygen level of the environment under consideration. In oxic systems, oxidation to - eventually - sulfate will occur.