D-Glucose, reaction products with alcohols C16-18 (even numbered)

Long-term toxicity to aquatic invertebrates

Link to relevant study record(s)

Reference

Endpoint:

long-term toxicity to aquatic invertebrates

Type of information:

experimental study

Adequacy of study:

key study

Study period:

18 Jan - 09 Feb 1995

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Qualifier:

according to guideline

Guideline:

other: OECD Guideline 202 Part II

GLP compliance:

yes

Analytical monitoring:

yes

Vehicle:

no

Details on test solutions:

PREPARATION AND APPLICATION OF TEST SOLUTION
- Method: Two stock solutions were prepared (1600 mg/L; 200 mg/L). The substance was heated before the initial weight (approx. 50 °C). Stock solutions were renewed every second or third day and stored in refrigerator (approx. 4 °C).

Test organisms (species):

Daphnia magna

Details on test organisms:

TEST ORGANISM
- Strain/clone: Straus 1820
- Source: In-house stock TTB-Ökologie, Henkel KGaA
- Feeding during test
- Food type: Scenedesmus subspicatus
- Amount: 0-7 days old species: 2.5*10^6 cells/daphnia/day / > 7 days old species: 5.0*10^6 cells/daphnia/day
- Frequency: every day

Test type:

semi-static

Water media type:

freshwater

Limit test:

no

Total exposure duration:

21 d

Hardness:

not stated

Test temperature:

21.7 - 22.0 °C

pH:

7.5 - 8.3 (control)
8.0 - 8.1 (highest test concentration)

Dissolved oxygen:

93-102%

Nominal and measured concentrations:

Nominal concentrations: 0, 1, 2, 4, 8, 16 mg/L
Measured concentrations for the nominal concentration of 2 mg/L: 2.1 mg/L (0 h); 1.9 mg/L (24 h) measured on day 6
Measured concentrations for the nominal concentration of 2 mg/L: 2.1 mg/L (0 h); 1.7 mg/L (24 h) measured on day 14
Measured concentrations for the nominal concentration of 2 mg/L: 1.9 mg/L (0 h); 1.8 mg/L (24 h) measured on day 21
Measured concentrations for the nominal concentration of 4 mg/L: 3.9 mg/L (0 h); 3.4 mg/L (24 h) measured on day 14
Measured concentrations for the nominal concentration of 4 mg/L: 3.8 mg/L (0 h); 3.6 mg/L (24 h) measured on day 21
Measured concentrations for the nominal concentration of 8 mg/L: 8.4 mg/L (0 h); 7.9 mg/L (24 h) measured on day 7

Details on test conditions:

TEST SYSTEM
- Test vessel: 100 mL conical-flasks
- Type: slightly closed
- fill volume: 50 mL
- Renewal rate of test solution: every day
- No. of organisms per vessel: 1
- No. of vessels per concentration (replicates): 10
- No. of vessels per control (replicates): 10


TEST MEDIUM / WATER PARAMETERS
- Source/preparation of dilution water: M4-Elendt medium


OTHER TEST CONDITIONS
- Photoperiod: 16/8 h

Reference substance (positive control):

no

Duration:

21 d

Dose descriptor:

NOEC

Effect conc.:

2 mg/L

Nominal / measured:

nominal

Conc. based on:

act. ingr.

Basis for effect:

reproduction

Duration:

21 d

Dose descriptor:

NOEC

Effect conc.:

1 mg/L

Nominal / measured:

nominal

Conc. based on:

act. ingr.

Basis for effect:

mortality

Duration:

21 d

Dose descriptor:

LOEC

Effect conc.:

2 mg/L

Nominal / measured:

nominal

Conc. based on:

act. ingr.

Basis for effect:

mortality

Duration:

21 d

Dose descriptor:

NOEC

Effect conc.:

4 mg/L

Nominal / measured:

nominal

Conc. based on:

test mat.

Basis for effect:

reproduction

Duration:

21 d

Dose descriptor:

NOEC

Effect conc.:

2 mg/L

Nominal / measured:

nominal

Conc. based on:

test mat.

Basis for effect:

mortality

Duration:

21 d

Dose descriptor:

LOEC

Effect conc.:

4 mg/L

Nominal / measured:

nominal

Conc. based on:

test mat.

Basis for effect:

mortality

Key result

Duration:

21 d

Dose descriptor:

EC10

Effect conc.:

1.76 mg/L

Nominal / measured:

nominal

Conc. based on:

act. ingr.

Remarks:

nominal concentration analytically verified

Basis for effect:

mortality

Remarks on result:

other:

Remarks:

recalculated from raw data

Reported statistics and error estimates:

A re-evaluation of the raw data has been conducted in order to obtain more reliable and robust ECx values instead of NOEC values. Recent scientific developments have led to a recommendation of abandoning the concept of NOEC and replacing it with regression based point estimates ECx.
A nonlinear regression using the 4-parameter logistic was performed on the raw data for mortality, using ToxRatStd Version 2.10@ software.
Parameters of the logistic equation: a = 96,33479, b = 23,54864, c = 3,86749, d = 0,00000. Sum of squared residuals: 80,66682.

Because of the good degradability of the substance the test setup was renewed every day. The species were transfered to new test vessels with renewed test solutions. The chemical analysis resulted in a recovery of the substance of more than 80%. Therefore, the nominal concentrations were used for the determination of the NOECs. The most sensitive endpoint for the substance was the mortality (NOEC: 2 mg/L (= 1 mg active matter/L); recalculated EC10: 3.52 mg/L (= 1.76 mg active matter/L)).

Results of the statistical re-evaluation:

EC10: 3.523 mg product/L, equivalent to 1.762 mg a.i./L

EC20: 3.646 mg product/L, equivalent to 1.823 mg a.i./L

EC10: 3.867 mg product/L, equivalent to 1.934 mg a.i./L

For details see attached statistical report.

Validity criteria fulfilled:

yes

Conclusions:

The 21 day chronic daphnia effect (reproduction/mortality) concentration, as determined according to OECD202 part2, EC10 = 1.762 mg/l related to active ingredient.

Description of key information

The 21 day chronic daphnia effect (reproduction/mortality) concentration, as determined according to OECD202 part2, EC10 = 1.762 mg/l related to active ingredient.

Key value for chemical safety assessment

Fresh water invertebrates

Fresh water invertebrates

Effect concentration:

1.762 mg/L