Reaction mass of Fatty acids, montan-wax and Fatty acids, montan-wax, calcium salts and Montan wax

Toxicity to microorganisms

Administrative data

Endpoint:

activated sludge respiration inhibition testing

Type of information:

migrated information: read-across based on grouping of substances (category approach)

Adequacy of study:

key study

Study period:

2003-02-18 - 2003-02-19

Reliability:

2 (reliable with restrictions)

Rationale for reliability incl. deficiencies:

other: see 'Remark'

Remarks:

The test was performed according to relevant guidelines and compliant to GLP. It is sufficiently documented and the results are plausible. The test was performed as a limit test without replicate for the treatment. However, in OECD guideline 209 five different test item concentrations are requrired (no replicates) and no criteria for a limit test are specified.

Data source

Reference

Reference Type:

study report

Title:

Unnamed

Year:

2003

Report date:

2003

Materials and methods

Test guideline

Qualifier:

according to guideline

Guideline:

OECD Guideline 209 (Activated Sludge, Respiration Inhibition Test

Deviations:

no

Principles of method if other than guideline:

not applicable

GLP compliance:

yes

Remarks:

Principles of Good Laboratory Practice (GLP) § 19a, German Chemical Act (ChemG)

Test material

Test material information

Constituent 1

Reference substance name:

Montan waxes, Type E

IUPAC Name:

Montan waxes, Type E

Constituent 2

Reference substance name:

Reaction mass of Fatty acids, montan-wax and Fatty acids, montan-wax, ethylene esters and Montan wax

EC Number:

914-475-5

Molecular formula:

R-CH2-COOR1OOC-CH2-R mainly

IUPAC Name:

Reaction mass of Fatty acids, montan-wax and Fatty acids, montan-wax, ethylene esters and Montan wax

Details on test material:

Name: Licowax E
Montan acids, ester of
Appearance: flakes
Colour: light yellow
Smell: characteristic
For substance characterization, an IR-Spectrum of the test substance had been prepared.

Specific details on test material used for the study:

Details on properties of test surrogate or analogue material (migrated information):
not applicable

Sampling and analysis

Analytical monitoring:

no

Test solutions

Vehicle:

no

Details on test solutions:

The test substance is of poor solubility in water (ca. 24 mg/L at 20°C). It was tested as a water accomodated fraction (WAF). To gain the water accomodated fraction, 10 g/L of the test substance was stirred for 24 hours in a 2 L glass beaker such, that the evolving swirl reached a depth of 10% of the waterlayer. After a 1 hour halt for settling of particles, the fraction was filtered through a paper filter to remove fine particles and was used in the test.

Test organisms

Test organisms (species):

activated sludge, domestic

Details on inoculum:

The fresh sludge had been washed three times with dechlorinated tap water and the amount of dry weight determined according to the guideline. In the test an equivalent of 4g dry weight/L had been used , corresponding to 19.32 g wet sludge per 500 mL of test water in this test.

Study design

Test type:

static

Water media type:

freshwater

Limit test:

yes

Total exposure duration:

3 h

Post exposure observation period:

not applicable

Test conditions

Hardness:

not applicable

Test temperature:

18.5 - 19.9 °C

Dissolved oxygen:

> 6.5 mg/L

Nominal and measured concentrations:

Limit test, a water accomodated fraction (WAF) had been used (water solubility ca. 24 mg/L at 20°C).

Details on test conditions:

The test has been conducted exactly as described in the OECD-guideline 209. However, instead of the 5 different concentrations of the test item, a limit test with the water accomodated fraction (without replicates) has been performed (nominal 10 000 mg/L).

Reference substance (positive control):

yes

Remarks:

3,5-dichlorphenol - 3, 10 and 30 mg/L

Results and discussion

Effect concentrations

Effect concentrations 1

Duration:

3 h

Dose descriptor:

EC10

Effect conc.:

> 10 g/L

Nominal / measured:

nominal

Conc. based on:

test mat.

Basis for effect:

inhibition of total respiration

Remarks:

respiration rate

Remarks on result:

other: lmit test, due to the low solubility of the test item

Effect concentrations 2

Duration:

3 h

Dose descriptor:

EC50

Effect conc.:

> 10 g/L

Nominal / measured:

nominal

Conc. based on:

test mat.

Basis for effect:

inhibition of total respiration

Remarks:

respiration rate

Remarks on result:

other: limit test, due to the low solubility of the test item

Effect concentrations 3

Duration:

3 h

Dose descriptor:

NOEC

Effect conc.:

10 g/L

Nominal / measured:

nominal

Conc. based on:

test mat.

Basis for effect:

inhibition of total respiration

Remarks:

respiration rate

Remarks on result:

other: limit test, due to the low solubility of the test item

Details on results:

The test substance did not induce any respiration inhibition of the activated sludge used.

Results with reference substance (positive control):

For the reference substance 2,3-dichlorophenol an EC50 (3 h) of 5 mg/L had been determined graphically on probability paper.

Any other information on results incl. tables

		concentration [mg/L]	Respiration rate [mg O2/L x h]	Inhibition [%]
control	K 1	-	51 .6	-
reference	R 1	3	29.6	40.6
	R 2	10	16.6	66.7
	R 3	30	6.0	88.0
Test substance	T1	10 000	50.0	-0.4*
control	K 2	-	48.0	-

* negative values for respiration inhibition are equivalent to a promotion of respiration

Applicant's summary and conclusion

Validity criteria fulfilled:

yes

Remarks:

The two control respiration rates differ no more than 15% from each other (7% in this study). The EC50 (3 h) of 3,5-dichlorophenol is in the accepted range of 5 to 30 mg/L (5 mg/L in this study).

Conclusions:

A respiration inhibition test with acitvated sludge from a municipal sewage treatment plant performed according to OECD 209 and GLP (reliability category 2) has been performed as a limit test with the test item due to its poor solubility (ca. 24 mg/L in water at 20°C). The test item (Licowax S) did not have any inhibitory effect on microbial respiration at a nominal concentration of 10 g/L. The EC10 (3 h) and EC50 (3 h) had been determined as larger than 10 g/L nominal concentration, the NOEC as being equal to 10 g/L nominal concentration.

Executive summary:

A respiration inhibition test with acitvated sludge from a municipal sewage treatment plant performed according to OECD 209 and GLP (reliability category 2) was performed as a limit test with the test item due to its poor solubility (ca. 24 mg/L in water at 20°C). The test item (Licowax S) did not exhibit any inhibitory effect on microbial respiration at a nominal concentration of 10 g/L. The EC10 (3 h) and EC50 (3 h) was determined as larger than 10 g/L nominal concentration, the NOEC as being equal to 10 g/L nominal concentration.