Chlorimuron ethyl

Toxicity to soil macroorganisms except arthropods

Administrative data

Endpoint:

toxicity to soil macroorganisms except arthropods: short-term

Type of information:

experimental study

Adequacy of study:

supporting 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:

study report

Title:

Unnamed

Year:

1991

Report date:

1991

Materials and methods

Test guideline

Qualifier:

no guideline followed

Principles of method if other than guideline:

The soil organisms, earthworms Eisenia foetida species, were exposed to different concentrations of the test substance for a 14-day period with artificial soil to determine the 14-day LC(I)50.

GLP compliance:

not specified

Test material

Test material information

Constituent 1

Reference substance name:

ethyl 2-({[(4-chloro-6-methoxypyrimidin-2-yl)carbamoyl]amino}sulfonyl)benzoate

EC Number:

618-690-2

Cas Number:

90982-32-4

Molecular formula:

C15H15ClN4O6S

IUPAC Name:

ethyl 2-({[(4-chloro-6-methoxypyrimidin-2-yl)carbamoyl]amino}sulfonyl)benzoate

Test material form:

solid

Details on test material:

Purity: 99.2%

Sampling and analysis

Analytical monitoring:

no

Test substrate

Vehicle:

yes

Remarks:

Distilled water

Test organisms

Test organisms (species):

Eisenia fetida

Animal group:

annelids

Study design

Study type:

laboratory study

Substrate type:

other: Amorphous silica (Sio2)

Limit test:

no

Total exposure duration:

14 d

Test conditions

Test temperature:

22 ± 2°C

Moisture:

70 ± 20%

Nominal and measured concentrations:

Nominal: 800, 1200, 1800, 2700 and 4050 mg/kg

Reference substance (positive control):

yes

Remarks:

Chloroacetamide

Results and discussion

Effect concentrations

Key result

Duration:

14 d

Dose descriptor:

other: LC(I)50

Effect conc.:

> 4 050 mg/kg soil ww

Nominal / measured:

nominal

Conc. based on:

test mat.

Basis for effect:

mortality

Applicant's summary and conclusion

Validity criteria fulfilled:

yes

Conclusions:

14 d LC(I)50: > 4050 mg/kg (mortality)

Executive summary:

The study was conducted to determine the toxicity of the test substance to adult earthworms for a 14-day period.

The tested nominal concentrations were 800, 1200, 1800, 2700 and 4050 mg/Kg. The vessels were firmly covered with black holey plastic films, to keep the substrate humid, and placed on a steel cabinet, that was also covered with black plastic film to reduce the luminosity. The vessels were observed in the 14th day after initiation of the test for evaluation of earthworm mortality.

The test substance exhibited a 14-day LC(I)50 greater than 4050 mg/kg, the highest dose tested, to the test organism Eisenia foetida. This value is equal to 2000 times the recommended label dose considering the area of 1 hectare, 1 cm depth, and soil density 1, therefore it was not necessary to test the doses higher than 4050 mg/kg.

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