Chlorinated Fatty Acid Methyl Ester

Short-term toxicity to aquatic invertebrates

Administrative data

Endpoint:

short-term toxicity to aquatic invertebrates

Type of information:

experimental study

Adequacy of study:

key study

Study period:

2007

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Data source

Reference

Reference Type:

study report

Title:

Unnamed

Year:

2007

Report date:

2007

Materials and methods

Test guideline

Qualifier:

according to guideline

Guideline:

OECD Guideline 202 (Daphnia sp. Acute Immobilisation Test)

Version / remarks:

2004 version

GLP compliance:

yes

Test material

Test material information

Constituent 1

Reference substance name:

methyl tetradecanoate, chloro

Molecular formula:

C13H26Cl4COOCH3 and C13H25Cl5COOCH3 (primary isomers based on product weight of 35-40% Cl by weight)

IUPAC Name:

methyl tetradecanoate, chloro

Constituent 2

Reference substance name:

Methyl octadecanoate, chloro

Molecular formula:

C17H30Cl4COOCH3, C17H29Cl5COOCH3 , and C17H28Cl6COOCH3 (primary isomers based on 35-40% Cl by weight)

IUPAC Name:

Methyl octadecanoate, chloro

Constituent 3

Reference substance name:

Methyl hexadecanoate, chloro

Molecular formula:

C15H28Cl4COOCH3 and C15H27Cl5COOCH3 (primary isomers based on 35-40% Cl by weight)

IUPAC Name:

Methyl hexadecanoate, chloro

Test material form:

liquid

Details on test material:

This is a UVCB substance developed from the chlorination of fatty acid methyl esters.

Specific details on test material used for the study:

Batch A070806

Sampling and analysis

Analytical monitoring:

no

Test solutions

Vehicle:

no

Details on test solutions:

According to the results of a pre-experiment, DA 8506 is not soluble at a concentration of 100 mg/L in the test water. Therefore, three WAFs (water accommodated fractions) with loading rates of the test item of 1.0, 10 and 100 mg/L were prepared. Two individual dispersions of the test item with loading rates of 10 and 100 mg/L were prepared by weighing adequate amounts of the test item by means of an analytical balance:
Loading rate 10 mg/L: 50.1 mg suspended in 5000 ml of test water
Loading rate 100 mg/L: 301.8 mg suspended in 3000 ml of test water

The test item was dispersed in the test media using ultrasonic treatment for 15 minutes. Then, the dispersions were stirred by magnetic stirrers at room temperature in the dark over 96 hours to dissolve a maximum amount of the test item in the test media. No auxiliary solvent or emulsifier was used. After the stirring period of 96 hours, each of the dispersions was filtered through a membrane filter (Schleicher & Schuell, Type NC45, pore size 0.45 μm). The filtrates were tested on the fish as WAFs.

The WAF of the lowest loading rate of 1.0 mg/L was prepared by dilution (1: 10) of the WAF with the loading rate of 10 mg/L with test water, due to technical reasons.

The finished test solutions were clear with no visible test material.

Additionally, a control (test water without test item) was tested in parallel

Test organisms

Test organisms (species):

Daphnia magna

Details on test organisms:

In each treatment and the control, 20 daphnids were tested, divided into two groups of ten animals.

At the start of the test, the test animals were 6-24 hours old and were not first brood progeny.

Study design

Test type:

static

Water media type:

freshwater

Remarks:

Reconstituted water according to the test guidelines

Limit test:

no

Total exposure duration:

48 h

Test conditions

Hardness:

Reconstituted water according to the test guidelines

Test temperature:

20 °C

pH:

7.7-7.8

Dissolved oxygen:

Control 8.6 mg/L, 8.5 mg/L (1.0 mg/L group); 7.6 mg/L (10 and 100 mg/L groups)

Salinity:

not applicable

Nominal and measured concentrations:

Nominal 1.0, 10 and 100 mg/L

Reference substance (positive control):

no

Results and discussion

Effect concentrations

Duration:

48 h

Dose descriptor:

EC0

Remarks:

No mortallity or mobility impairment observed

Effect conc.:

100 mg/L

Nominal / measured:

nominal

Conc. based on:

test mat.

Basis for effect:

mortality

Remarks:

and mobility

Details on results:

There were no effects on mortality or mobility observed in any of the test concentrations.

Applicant's summary and conclusion

Conclusions:

Based on this study, chlorinated methyl esters are not acutely toxic to daphnia at loading level up to 100 mg/L. This concentration is well above the expected water solubility limit for this substance.

Executive summary:

A 48 hour study of chlorinated methyl esters in Daphnia magna was conducted using water accommodated fractions (stirred for 96 hours) at nominal concentrations of 1, 10 and 100 mg/L. There were no effects on mobility of mortality at at concentration. The LC50 is >100 mg/L. The EC0 for this study was 100 mg/L.