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Ecotoxicological information

Long-term toxicity to aquatic invertebrates

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Administrative data

Endpoint:
long-term toxicity to aquatic invertebrates
Type of information:
experimental study
Adequacy of study:
key study
Study period:
No data
Reliability:
1 (reliable without restriction)

Data source

Reference
Reference Type:
study report
Title:
Unnamed
Year:
1987
Report date:
1987

Materials and methods

Test guideline
Qualifier:
according to guideline
Guideline:
other: SLS protocol "Protocol for 21-Day flow through chronic toxicity test with water flea Daphnia magna. This study generally follows the guidelines established by EPA/OTS.
Deviations:
not specified
GLP compliance:
yes

Test material

Constituent 1
Chemical structure
Reference substance name:
-
EC Number:
419-690-3
EC Name:
-
Cas Number:
88020-55-7
Molecular formula:
[(C12H25)3NH]4Mo8O26
IUPAC Name:
tridodecylamine hydrate molybdenum

Sampling and analysis

Analytical monitoring:
not specified

Test solutions

Vehicle:
not specified
Details on test solutions:
Identity and concentration of auxiliary solvent or details for dispersal :
- preparation of a solution of 100 mg/l,
- magnetic stirring, 24 heures,
- released time : 1 hour,
- the filtered aqueous fraction is the solution stock , and successive dilutions.

Test organisms

Test organisms (species):
Daphnia magna

Study design

Test type:
flow-through
Water media type:
freshwater
Total exposure duration:
21 d

Test conditions

Hardness:
CA 180 mg CaCO3/L

Results and discussion

Effect concentrationsopen allclose all
Duration:
21 d
Dose descriptor:
EC50
Effect conc.:
> 2.4 mg/L
Basis for effect:
reproduction
Duration:
21 d
Dose descriptor:
NOEC
Effect conc.:
>= 2.4 mg/L
Dose descriptor:
NOEC
Effect conc.:
>= 2.4 mg/L
Basis for effect:
other: mortality

Any other information on results incl. tables

Comments:
- The tested concentrations were the following :
nominal conc.  6.3     13      25      50      100(mg/l)
measured conc. 0.14    0.38    0.62    1.4     2.4(mg/l)
The measured concentrations below are the average of the average of the measured concentrations at days 0, 7, 14 and 21.

1st clutch emergence deadline: <= 9days
Total number of youngs in 21 days:
- 63 for the test group
- 67-79 for the exposed females

Applicant's summary and conclusion

Conclusions:
NOEC > 2.4mg/L

The results of this study established that concentrations of NORCAT M which were at or below the practicle solubility limits of the test material in water did not affect the survival or reproduction of Daphnia magna.