Reaction mass of 2-ethylpropane-1,3-diol and 5-ethyl-1,3-dioxane-5-methanol and propylidynetrimethanol

Toxicity to aquatic algae and cyanobacteria

Administrative data

Endpoint:

toxicity to aquatic algae and cyanobacteria

Type of information:

experimental study

Adequacy of study:

key study

Study period:

October 2008

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Data source

Reference

Reference Type:

study report

Title:

Unnamed

Year:

2008

Report date:

2008

Materials and methods

Test guideline

Qualifier:

according to guideline

Guideline:

OECD Guideline 201 (Alga, Growth Inhibition Test)

Deviations:

no

GLP compliance:

yes

Test material

Test material information

1

Reference substance name:

Reaction mass of 2-ethylpropane-1,3-diol and5-ethyl-1,3-dioxane-5-methanol and propylidynetrimethanol

IUPAC Name:

Reaction mass of 2-ethylpropane-1,3-diol and5-ethyl-1,3-dioxane-5-methanol and propylidynetrimethanol

Details on test material:

Polyol TD, batch no. 3977901, was described as a clear liquid, and stored at ambient temperature in the dark. Stability purity and identity were confirmed by the sponsor in a material safety data sheet (not available).

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:

yes

Details on sampling:

Samples of the stock solution and the highest tested concentration at 0 h and 72 h were collected and stored in the freezer until analysed by the
Sponsor.

Test solutions

Vehicle:

no

Details on test solutions:

2000.1 mg of the test item was solved in 1000 mL of growth medium by magnetic stirring on the day of the test start. The test solutions were made by dilution of the stock solution (2000 mg/L) with growth medium.

Test organisms

Test organisms (species):

Pseudokirchneriella subcapitata (previous names: Raphidocelis subcapitata, Selenastrum capricornutum)

Details on test organisms:

TEST ORGANISM
- Strain: NIVA CHL 1
- Source (laboratory, culture collection): Toxicon's culture, originating from NIVA, Oslo, Norway.

Study design

Test type:

static

Water media type:

freshwater

Limit test:

no

Total exposure duration:

72 h

Post exposure observation period:

Not applicable

Test conditions

Hardness:

Not applicable

Test temperature:

21 - 24ºC - nominal values

pH:

8.1±0.2 - nominal values

Dissolved oxygen:

Not applicable

Salinity:

Not applicable

Nominal and measured concentrations:

nominal: 31.2, 62.5, 125, 250, 500, 1000, 2000 mg/L.

Details on test conditions:

TEST SYSTEM
- Test vessel:
- Type (delete if not applicable): E-bottles
- Material, size, headspace, fill volume: glass, 250 mL, 100 mL fill volume
- Aeration: not applicable
- Control end cells density: Yield (end density - starting density) = 556667 cells/mL (C.V. = 16.1%).
- No. of vessels per concentration (replicates): 3
- No. of vessels per control (replicates): 6



GROWTH MEDIUM
- Standard medium used: yes (as specified in OECD TG 201)


OTHER TEST CONDITIONS
- Sterile test conditions: yes (components of growth medium were autoclaved or sterile filtered before use.
- Adjustment of pH: No.
- Photoperiod: Continuous illumination
- Light intensity and quality: 100 µEm-2s-1


EFFECT PARAMETERS MEASURED (with observation intervals if applicable) :
- Determination of cell concentrations: The number of cells/mL was counted by microscope at 0, 24, 48, and 72 hours.


TEST CONCENTRATIONS
- Spacing factor for test concentrations: 2-fold ( 31.2, 32.5, 125, 250, 500, 1000, and 2000 mg/L)

Reference substance (positive control):

yes

Remarks:

Test substance not identified

Results and discussion

Effect concentrations

Effect concentrations 1

Duration:

72 h

Dose descriptor:

EC50

Effect conc.:

743 mg/L

Nominal / measured:

nominal

Conc. based on:

test mat.

Basis for effect:

growth rate

Effect concentrations 2

Duration:

72 h

Dose descriptor:

NOEC

Effect conc.:

62 mg/L

Nominal / measured:

nominal

Conc. based on:

test mat.

Basis for effect:

growth rate

Effect concentrations 3

Duration:

72 h

Dose descriptor:

EC50

Effect conc.:

144 mg/L

Nominal / measured:

nominal

Conc. based on:

test mat.

Basis for effect:

biomass

Effect concentrations 4

Duration:

72 h

Dose descriptor:

NOEC

Effect conc.:

62 mg/L

Nominal / measured:

nominal

Conc. based on:

test mat.

Basis for effect:

biomass

Details on results:

- Exponential growth in the control (for algal test): yes
- Any stimulation of growth found in any treatment: No

Results with reference substance (positive control):

Report states the following:

A qualification test on the alga culture was made on 5 June 2008 to assure the quality of the test animals. ErC50 was 1.5 mg/L which confirmed theculture was suitable as a test organism according to OECD TG no 201.

Reported statistics and error estimates:

The EC50 values were calculated by means of graphic interpolation. The NOEC was defined as the highest tested concentration not statistically different from the controls according to the Mann-Whitney U-test (p>0.05)

Any other information on results incl. tables

Calculated specific growth and biomass results (72 hours)

Nominal concentration (mg/L)	72 hours Specific growth rate (μ) Mean ± CV (%)	% inhibition
Control	1.34 ± 4.0	-
31.2	1.27 ± 5.8	5
62.5	1.19 ± 13.0	11
125	1.11 ± 16.0	17
250	1.03 ± 5.8	23
500	0.97 ± 6.2	28
1000	0.35 ± 26.8	74
2000	0.0	100
	72 h Yield (cells/ml) Mean ± CV (%)	% inhibition
Control	556667 ± 16.1	-
31.2	450000 ± 21.2	19
62.5	373333 ± 40.2	33
125	290000 ± 45.6	48
250	213333 ± 17.8	62
500	176667 ± 18.2	68
1000	2000 ± 50.0	100
2000	0.0	100

Applicant's summary and conclusion

Validity criteria fulfilled:

yes

Conclusions:

A 72 hour algal growth inhibition study, test species Selenastrum capricornutum, was performed to determine the toxic effects of the test substance Polyol TD. The test was conducted according to OECD test guideline 201, and performed to GLP. Based on nominal exposure concentrations the 72 hour ErC50 was calculated to be 743 mg/L and the corresponding no-observed effect concentration (NOEC) was 62 mg/L. The 72 hour EyC50 was calculated to be 144 mg/L and the corresponding NOEC was 62 mg/L.

Executive summary:

A 72 hour algal growth inhibition study, test species Selenastrum capricornutum, was performed to determine the toxic effects of the test substance Polyol TD. The test was conducted according to OECD test guideline 201, and performed to GLP. Based on nominal exposure concentrations the 72 hour ErC50 was calculated to be 743 mg/L and the corresponding no-observed effect concentration (NOEC) was 62 mg/L. The 72 hour EyC50 was calculated to be 144 mg/L and the corresponding NOEC was 62 mg/L.