Registration Dossier

Ecotoxicological information

Toxicity to soil macroorganisms except arthropods

Administrative data

Endpoint:
toxicity to soil macroorganisms except arthropods: long-term
Remarks:
No long-term data are considered to be needed , since substance is biodegradable and not adsorptive.
Type of information:
experimental study
Adequacy of study:
key study
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
study well documented, meets generally accepted scientific principles, acceptable for assessment

Data source

Reference
Reference Type:
publication
Title:
The relative toxicity of metaldhyde and iron phosphate-based molluscicides to earthworms
Author:
Edwards, C et al.
Year:
2009
Bibliographic source:
Crop Protection 28: 289-294

Materials and methods

Test guideline
Qualifier:
according to guideline
Guideline:
OECD Guideline 207 (Earthworm, Acute Toxicity Tests)
GLP compliance:
no
Remarks:
(Published) Study not peformed for REACH purposes. Therefore, GLP-compliance was not an issue for publication.

Test material

Constituent 1
Chemical structure
Reference substance name:
Edetic acid
EC Number:
200-449-4
EC Name:
Edetic acid
Cas Number:
60-00-4
Molecular formula:
C10 H16 N2 O8
IUPAC Name:
2-({2-[bis(carboxymethyl)amino]ethyl}(carboxymethyl)amino)acetic acid
Test material form:
solid

Sampling and analysis

Analytical monitoring:
not specified
Details on sampling:
no data

Test substrate

Vehicle:
no
Details on preparation and application of test substrate:
EDTA were applied in deionized water solution into artificial soil (35 % dry weight moisture content).

Test organisms

Test organisms (species):
Eisenia fetida
Animal group:
annelids
Details on test organisms:
no data available

Study design

Study type:
laboratory study
Substrate type:
artificial soil
Limit test:
no
Total exposure duration:
14 d
Post exposure observation period:
no data available

Test conditions

Test temperature:
20 °C
pH:
no data available
Moisture:
35 % of maximum holding capacity
Details on test conditions:
Glass jars were used as test containers. 750 g of artificial soil which had been treated with one of the test chemicals (or a control with no chemicals) were placed in each jar. Ten E. fetida each with live weights of approximately 1 mg were added to each jar. There were four replicates of each chemical and dose.
Nominal and measured concentrations:
0, 0.1, 1.0, 10.0, 100.0, 1000.0 and 10000.0 mg/kg dry weight soil.
Reference substance (positive control):
not specified

Results and discussion

Effect concentrations
Key result
Duration:
14 d
Dose descriptor:
EC50
Effect conc.:
156.46 mg/kg soil dw
Nominal / measured:
nominal
Conc. based on:
test mat.
Basis for effect:
mortality
Remarks on result:
other: 136.01 - 179.98
Results with reference substance (positive control):
no data available
Reported statistics and error estimates:
Data were analyzed statistically by analysis of variance using S.A.S. software.
The LD50 values were estimated using Trimmed Spearman–Karber Version 1.5 (S.E.P.A. Cincinnati, Ohio) designed for analysis of mortality data from acute chronic toxicity tests.

Applicant's summary and conclusion

Validity criteria fulfilled:
not specified
Conclusions:
The 14 day LC50 of EDTA to earthworms (Eisenia foetida) was estimated to be 156 mg/kg dry weight soil.
Executive summary:

The 14 day LC50 of EDTA to earthworms (Eisenia foetida) was estimated to be 156 mg/kg dry weight soil.