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Toxicity to soil macroorganisms except arthropods

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Reference
Endpoint:
toxicity to soil macroorganisms except arthropods: short-term
Type of information:
experimental study
Adequacy of study:
key study
Study period:
Feb. 27 2013 - Jun. 6, 2013
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to
Guideline:
OECD Guideline 207 (Earthworm, Acute Toxicity Tests)
Version / remarks:
1984
Deviations:
no
Qualifier:
according to
Guideline:
EPA OPPTS 850.6200 (Earthworm Subchronic Toxicity Test)
Version / remarks:
1996
Deviations:
no
GLP compliance:
yes
Details on preparation and application of test substrate:
- Method of mixing into soil: directly added
Test organisms (species):
Eisenia fetida
Animal group:
nematods
Details on test organisms:
TEST ORGANISM
- Common name: Earthworm
- Source: Nanjing Earthworm Nursery, China
- Age at test initiation (mean and range, SD): two month old adult
- Weight at test initiation: 377 mg
- Batch: E20130301

ACCLIMATION
- Acclimation period: 24 h
Study type:
laboratory study
Substrate type:
artificial soil
Limit test:
yes
Total exposure duration:
14 d
Test temperature:
18 - 22°C
pH:
6.0 - 6.5
Moisture:
35%
Details on test conditions:
TEST SYSTEM
- No. of organisms per container (treatment): 10
- No. of replicates per treatment group: 4
- No. of replicates per control: 4

OTHER TEST CONDITIONS
- Photoperiod: continuous light
- Light intensity: 400 - 800 lux

EFFECT PARAMETERS MEASURED:
mortality, reaction on mechanical stimulus, behavioural and pathological symptoms assessed at days 7 and 14

TEST CONCENTRATIONS
- Range finding study
- Test concentrations: 10, 100, 1000 mg/kg dw
Nominal and measured concentrations:
Nominal concentration 1000 mg/kg dw
Reference substance (positive control):
yes
Remarks:
2-Chloroacetamide, purity >=98.5%
Key result
Duration:
14 d
Dose descriptor:
NOEC
Effect conc.:
1 000 mg/kg soil dw
Nominal / measured:
nominal
Conc. based on:
test mat.
Basis for effect:
mortality

Study design

In this GLP study performed according to OECD GL 207 the acute toxicity of the test item in earthworms was investigated. During this test, the artificial soils was used with the moisture content of the test medium controlled in range of 30 - 36 % with pH values of 6 - 6.5. The test conditions were maintained at 18 - 22°C, a humidity of 35 % and continuous light with intensity of 400 - 800 lux.

Results

No dead earthworms were observed in treatments and control. During test all animals remained in soil. Based on the result of range-finding test and the Limit Test, the 14 d-LC50 of the test item in the artificial soil was determined to be greater than 1000 mg/kg dry weight soil. The highest concentration causing no mortality (14 d-LC0) was 1000 mg/kg dry weight soil.

Conclusion

No mortality was observed within the test period. Therefore, the 14 d-LC50 was determined to be >1000 mg/kg dw and the NOEC was at 1000 mg/kg dw.

Validity criteria fulfilled:
yes
Conclusions:
A limit test on the acute toxicity of the test item was conducted according to OECD 207. The earthworm Eisenia fetida was used for the test in artificial soil. No mortality was observed within the test period. Therefore, the 14 d-LC50 was determined to be >1000 mg/kg dw and the NOEC was at 1000 mg/kg dw.

Description of key information

The Toxicity to soil macroorganisms except arthropods was studied in a GLP compliant OECD TG 207 assay. No mortality was observed within the test period. Therefore, the 14 d-LC50 was determined to be >1000 mg/kg dw and the NOEC was at 1000 mg/kg dw.

Key value for chemical safety assessment

Short-term EC50 or LC50 for soil macroorganisms:
1 000 mg/kg soil dw

Additional information