Registration Dossier

Ecotoxicological information

Toxicity to aquatic plants other than algae

Administrative data

Endpoint:
toxicity to aquatic plants other than algae
Type of information:
experimental study
Adequacy of study:
other information
Reliability:
3 (not reliable)
Rationale for reliability incl. deficiencies:
other: 3b: Significant methodological defficiencies Concentration tested irrealist, evidence of undissolved substance.

Data source

Referenceopen allclose all

Reference Type:
secondary source
Title:
Comparison of static-replacement and flow-through bioassays using duckweed, Lemna gibba G-3.
Author:
Davis JA
Year:
1981
Bibliographic source:
US EPA, Report. No. 560/6-81-003, 89.
Reference Type:
other: Risk assessment report
Title:
Unnamed
Year:
2008

Materials and methods

Principles of method if other than guideline:
Inhibition of growth of Lemna gibba during 7 days exposure in semi static conditions.

Test material

Reference
Name:
Unnamed
Type:
Constituent

Results and discussion

Effect concentrations
Duration:
7 d
Dose descriptor:
EC50
Effect conc.:
> 397 - < 7 582 mg/L
Nominal / measured:
nominal
Details on results:
The long-term (7d) nominal EC50-values between 397
and 7,582 mg/l, reported for the macrophyte Lemna gibba (Davis, 1981) are several orders of
magnitude above the apparent solubility of DEHP. The actual effect concentrations in these tests
were therefore most likely lower than the reported. In addition, the comment that the toxicant formed oil droplets etc. further supports that the actual concentration of dissolved DEHP in this study, was considerably lower than the nominal values. This might also indicate that the observed effects were due to physical effects, not relevant for environmental exposure conditions.

Applicant's summary and conclusion