Toxicity to microorganisms.001
Administrative data
- Purpose flag:
- key study
- Study result type:
- read-across from supporting substance (structural analogue or surrogate)
- Reliability:
- 2 (reliable with restrictions)
- Rationale for reliability incl. deficiencies:
- Although it is not a standard test and not all test
parameters were reported, the results can be considered reliable with restrictions.
Methodology was clearly reported.
Data source
Referenceopen allclose all
- Reference Type:
- publication
- Title:
- The effect of high salinity on activated sludge effluent quality.
- Author:
- Tokuz, R.Y.
- Year:
- 1986
- Bibliographic source:
- Curr.Pract. Environ. Sci. Eng. 2:143-154.
- Reference Type:
- publication
- Title:
- The effect of inorganic salts on the activated sludge process performance
- Author:
- Tokuz, R.Y. and Eckenfelder, W.W.
- Year:
- 1979
- Bibliographic source:
- Water Res. 13(1):99-104.
Materials and methods
- Principles of method if other than guideline:
- Method: other: see free text
- GLP compliance:
- no
Test materials
- Identity of test material same as for substance defined in section 1 (if not read-across):
- no
Test material identityopen allclose all
- Identifier:
- EC name
- Identity:
- sodium sulphate
- Details on test material:
- No specific Data reported Sodium Sulphate
- Analytical monitoring:
- yes
Test organisms
- Test organisms (species):
- activated sludge
Study design
- Test type:
- other: Continuous Flow
- Total exposure duration:
- 36 d
Test conditions
- Details on test conditions:
- Type: aquatic
Results and discussion
Effect concentrationsopen allclose all
- Duration:
- 37 d
- Endpoint:
- NOEC
- Effect conc.:
- ca. 26 g/L
- Remarks (e.g. 95% CL):
- Bacteria in active sludge
- Duration:
- 37 d
- Effect conc.:
- ca. 26 g/L
- Nominal / measured:
- nominal
- Remarks (e.g. 95% CL):
- Mobile protozoa in activated sludge
- Duration:
- 37 d
- Endpoint:
- NOEC
- Effect conc.:
- ca. 8 g/L
- Nominal / measured:
- nominal
- Remarks (e.g. 95% CL):
- Stalked Cilliates in activated sludge
- Any other information on results incl. tables:
- The increasing concentrations of sodium sulfate did not cause any appreciable deterioration in effluent quality in terms of effluent suspended solids and COD. The eflluent COD stayed more or less at a constant level and suspended solids concentration increased slightly. The rate: of increase of salinity was much faster for the sodium sulfate system but no negative effects were seen. Effects were measured by the efficiency of DOC removal.
Applicant's summary and conclusion
- Conclusions:
- No significant negative effects were observed. Sodium sulphate actually increased quality of effluent in some cases. The gradual increase used in
this experiment did give bacteria time to adapt. However it appears that water treatment plants would be unaffected by high concentrations of
sodium sulphate. - Executive summary:
- Study combined a literature search and new work and explained method clearly. However no standard procedures were followed. Study was not to GLP and no details on the analytical method were given. This study is reliable with the restrictions mentioned.
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- Study result type:
- read-across from supporting substance (structural analogue or surrogate)
- Reliability:
- 2 (reliable with restrictions)
- Rationale for reliability incl. deficiencies:
- Study scored as reliable with restrictions in Iuclid 4. Study in Italian and not re-reviewed. Iuclid 4 rationale below :
Although it is not a standard test and not all test
parameters were reported, the results are reliable for
assessment. Study with enough details. - Reference Type:
- publication
- Title:
- Effetti della salinità su sistemi biologici. Inquinamento
- Author:
- Gilli, G. and Comune, P.M.
- Year:
- 1980
- Bibliographic source:
- Inquinamento 22(100):31-35
- Principles of method if other than guideline:
- Method: other
- GLP compliance:
- no
- Identity of test material same as for substance defined in section 1 (if not read-across):
- no
- Details on test material:
- IUCLID4 Test substance: as prescribed by 1.1 - 1.4
- Test organisms (species):
- activated sludge
- Details on test conditions:
- Type: aquatic
- Duration:
- 40 d
- Endpoint:
- NOEC
- Effect conc.:
- ca. 30 g/L
- Conclusions:
- Validated in iuclid 4 not re-validated due to language. Iuclid 4 score used.
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