2,2,6,6-Tetramethylpiperidin-4-yl dodecanoate

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:

key study

Study period:

2012 - 2013

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

other: OECD guideline study conductd according to GLP

Data source

Reference

Reference Type:

study report

Title:

Unnamed

Year:

2013

Report date:

2013

Materials and methods

Test guideline

Qualifier:

according to guideline

Guideline:

OECD Guideline 207 (Earthworm, Acute Toxicity Tests)

GLP compliance:

yes

Test material

Test material information

Constituent 1

Reference substance name:

2,2,6,6-tetramethylpiperidin-4-yl dodecanoate

EC Number:

700-503-1

Cas Number:

101238-01-1

Molecular formula:

C21 H41 N O2

IUPAC Name:

2,2,6,6-tetramethylpiperidin-4-yl dodecanoate

Sampling and analysis

Analytical monitoring:

no

Test substrate

Vehicle:

no

Details on preparation and application of test substrate:

The dry constituents were blended in the correct proportions with sphagnum peat 10%, kaolin clay 20%, industrial sand 70% and mixed thoroughly, either in a large-scale laboratory mixer or small electric cement mixer. Moisture content was then determined by drying a small sample at 105°C and re-weighing. Deionized water was added to give an overall moisture content of about 27% of the dry weight, and the medium was thoroughly mixed.

Test organisms

Test organisms (species):

Eisenia fetida

Animal group:

annelids

Details on test organisms:

Species: Eisenia foetida
Batch No.: EEf20111014-1
Age: older than 2 months
Weight: 362 mg -405 mg
Amount: 80 individuals
Source: Zhuhai Hongming Earthworm Breeding Park

Selected reasons:
The recommended test species is Eisenia foetida (Michaelsen). Although this is not a typical soil species, it occurs in soil rich in organic matter. Its susceptibility to chemicals resembles that of true soil-inhabiting species, it has a short life cycle and is very prolific. It is available commercially and can be bred readily in a wide range of organic waste materials. Cocoons can be purchased commercially or distributed from a central source to ensure the same strain is used. “The Guidelines for the Testing of Chemicals” recommend the use of this species.

Holding:
All earthworms are to be obtained and held in the laboratory for 14 days under the same surroundings before used. During the holding period, all the earthworms should be healthy. They are breeding for 24h in the artificial soil before artificial soil test.

Study design

Study type:

laboratory study

Substrate type:

artificial soil

Limit test:

yes

Total exposure duration:

14 d

Test conditions

Test temperature:

17.5 - 19.7 deg. C

pH:

6.5 (start of the test)

Moisture:

73.0 - 98.0%

Details on test conditions:

Type of test: Acute toxicity test in artificial soil test
Test organism: Eisenia foetida.
Test duration: 14d
Test concentration: One test group of 1000 mg/kg dry soil was designed
Control: A blank control was designed
Replicates: 4 replicates/blank control, 4 replicates/test substance
Test organism number: 10 earthworms/parallel
Preparation of test system: About 10g of a mixture of fine ground quartz sand and 550mg of test substance are mixed with 740g wet artificial soil for each test container to form 1000mg/kg dry soil test systems. Four test systems are prepared for each test group.
Temperature in incubator: 17.5°C-19.7°C
Light condition: Continuous light, the light intensity was 562 lx at the beginning of the test and 624 lx at the end of the test.

Nominal and measured concentrations:

1000 mg/kg dw

Reference substance (positive control):

yes

Remarks:

chloracetamide

Results and discussion

Effect concentrations

Duration:

14 d

Dose descriptor:

LC50

Effect conc.:

> 1 000 mg/kg soil dw

Nominal / measured:

nominal

Conc. based on:

test mat.

Basis for effect:

mortality

Applicant's summary and conclusion

Validity criteria fulfilled:

yes