O-isopropyl ethylthiocarbamate

Short-term toxicity to aquatic invertebrates

Link to relevant study record(s)

Reference

Endpoint:

short-term toxicity to aquatic invertebrates

Type of information:

experimental study

Adequacy of study:

key study

Study period:

OCT 2012

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Qualifier:

according to guideline

Guideline:

OECD Guideline 202 (Daphnia sp. Acute Immobilisation Test)

GLP compliance:

yes

Specific details on test material used for the study:

Details on properties of test surrogate or analogue material:
Physico-Chemical properties
-Water solubility: 2.59 - 2.96 g/L

Analytical monitoring:

yes

Details on sampling:

For verification of test concentrations, samples were collected from additional test beakers without animals made for this porpose only. At the initiation of the test, before and after renewall at 24 hours and at the termination of the test, duplicate subsamples were collected of each test concentration.

Details on test solutions:

A stock solution of 100 mg/l were prepared by weighing out 100 mg of the test product and dissolve it in 1 l test medium. pH was adjusted to 7.8 ± 0.2 in the stock solution. The test solutions were prepared by diluting the stock solution in the test medium. The following nominal concentrations were tested: 0 (control); 2.0; 5.0; 10; 20; 50 and 100 mg/L

Test organisms (species):

Daphnia magna

Details on test organisms:

A strain of freshwater crustacean Daphnia magna (Straus) Cladocera, Crustacea originally isolated from Langedam (Birkerød, Denmark), har been cultured at DHI since 1979. Animals from this culture were used in the study.

Test type:

semi-static

Water media type:

freshwater

Limit test:

no

Total exposure duration:

48 h

Nominal and measured concentrations:

The analytically determined test item concentrations in the analyzed test media samples (dilutions 1:2, 1:5, 1:10, 1:20, 1:50, 1:100 and the undiluted filtrate) amounted to 1, 2, 5, 10, 20, 50 and 100 mg/L at the start of the test. The values found at the end of the test ranged from 83 to 104% of the initially measured values. Under the test conditions the test item was stable during the test period of 48 hours. The reported biological results are related to the initially measured test item concentrations.

Key result

Duration:

48 h

Dose descriptor:

EC50

Effect conc.:

60 mg/L

Nominal / measured:

nominal

Conc. based on:

test mat.

Basis for effect:

mobility

Conclusions:

The 48-hour EC50 was calculated to be 60 mg/L.
The validation of the test concentrations by chemicals analyses showed a deviation from the nominal concentration throughout the test lower than 20 per cent. Therefore, results are based on the nominal concentration.

Executive summary:

The short term toxicity to aquatic invertebrates test was done according to OECD Guideline 202. Daphnia magna was exposed to test item for 48hours. EC50(48h) value is 60 mg/L.

Description of key information

Key_short term toxicity to aquatic invertebrates_Kamper, 2013: OECD 202; Daphnia magna; 48h; EC50(48h): 60mg/L
Supp_short term toxicity to aquatic invertebrates_Flottec, 2009: OECD 202; Dapnia magna; 48h; LC50(48h): 17mg/L

Key value for chemical safety assessment

Fresh water invertebrates

Fresh water invertebrates

Dose descriptor:

EC50

Remarks:

48h

Effect concentration:

60 mg/L

Additional information

The short term toxicity to aquatic invertebrates test was done according to OECD guideline 202. Daphnia magna was exposed to test item for 48hours. EC50(48h) value is 60mg/L.