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Short-term toxicity to aquatic invertebrates

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Endpoint:
short-term toxicity to aquatic invertebrates
Type of information:
experimental study
Adequacy of study:
key study
Study period:
1995-01-17 to 1995-01-19
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
other: Guideline study. The study was conducted according to an appropriate EU test method, and in compliance with GLP.
Qualifier:
according to
Guideline:
EU Method C.2 (Acute Toxicity for Daphnia)
Deviations:
no
GLP compliance:
yes (incl. certificate)
Analytical monitoring:
yes
Details on sampling:
Test substance concentration determined in the stock solution used to prepare the test media.

Test substance concentration was determined in all treatments at the start and end of the test.
Vehicle:
no
Details on test solutions:
PREPARATION AND APPLICATION OF TEST SOLUTION

- Method: A 1000 mg/l stock solution was prepared by mixing for 18 hours followed by filtration. The other treatments were prepared by dilution of the stock solution. The measured DOC concentration in the stock solution was 427 mg/l which was equivalent to 986 mg/l of the test substance.

- Controls: Dilution water
Test organisms (species):
Daphnia magna
Details on test organisms:
TEST ORGANISM

- Common name: Daphnia magna

- Strain: Clone 5

- Source: Stock culture

- Age at study initiation (mean and range, SD): <24 h

- Method of breeding: Parthenogenetic reproduction

- Feeding during test: None

ACCLIMATION

- Acclimation conditions (same as test or not): yes

- Type and amount of food: sufficient to be consumed each day leaving no residue

- Feeding frequency: daily
Test type:
static
Water media type:
freshwater
Limit test:
no
Total exposure duration:
48 h
Hardness:
The sum of the Ca2+ and Mg2+ ions was 2.5 mmol
Test temperature:
20 +/-1ºC
pH:
8.0 - 8.3
Dissolved oxygen:
8.0 - 8.4 mg/l
Salinity:
not applicable
Nominal and measured concentrations:
Nominal: 0(Control), 20, 35, 59, 108 and 197 mg/l

Measured concentration in stock solution used to prepare test media: 986 mg/l

Measured concentration in treatments at the start of the test: 0, 26, 36, 59, 106 and 194 mg/l

Measured concentration in treatments at the end of the test: 0, 19, 33, 58, 105 and 156 mg/l

The test results are interpreted with reference to nominal concentrations.
Details on test conditions:
TEST SYSTEM

- Test vessel:

- Type: open

- Material, size, headspace, fill volume: glass cylinder containing 10 ml of test medium

- Aeration: none

- No. of organisms per vessel: 5

- No. of vessels per concentration (replicates): 4

- No. of vessels per control (replicates): 4

TEST MEDIUM / WATER PARAMETERS

- Source/preparation of dilution water: Elendt M4 medium

- Intervals of water quality measurement: end of test

OTHER TEST CONDITIONS

- Photoperiod: Dark

EFFECT PARAMETERS MEASURED: Immobilization after 24 and 48 h exposure

TEST CONCENTRATIONS

- Spacing factor for test concentrations: 1.7
Reference substance (positive control):
yes
Remarks:
Potassium dichromate
Duration:
48 h
Dose descriptor:
EC50
Effect conc.:
81 mg/L
Nominal / measured:
nominal
Conc. based on:
test mat.
Remarks:
but exposure is to hydrolysis products
Basis for effect:
mobility
Remarks on result:
other: 59-108 mg/L
Duration:
48 h
Dose descriptor:
NOEC
Effect conc.:
35 mg/L
Nominal / measured:
nominal
Conc. based on:
test mat.
Remarks:
but exposure is to hydrolysis products
Basis for effect:
mobility
Details on results:
- Mortality of control: 10%

- Other adverse effects control: none reported
Results with reference substance (positive control):
48-h EC50: >1.0, <2.0 mg/l
Reported statistics and error estimates:
The EC50 and its confidence interval were determined by Probit analysis. The NOEC value was obtained directly from the raw data.

Table 1. Test results

 Nominal test concentration (mg/l)  Mean percentage immobilisation after 24 hours  Mean percentage immobilisation after 48 hours
 0 (Control)  0  10
 20  0  0
 35  0  0
 59  10  15
 108  50  80
 197  90  90
Validity criteria fulfilled:
yes
Conclusions:
A 48 hour EC50 value of 81 mg/l and a NOEC of 35 mg/l have been determined for the effects of the test substance on mobility of Daphnia magna. The results are expressed relative to nominal concentrations of the test substance. However the substance is subject to rapid hydrolysis and under the test conditions it is therefore likely that exposure will have been to its hydrolysis products (methanol and trisilanols).
Endpoint:
short-term toxicity to aquatic invertebrates
Type of information:
read-across from supporting substance (structural analogue or surrogate)
Adequacy of study:
key study
Justification for type of information:
Please refer to the attached justification for grouping of substances provided in IUCLID Section 13.
Reason / purpose:
read-across source
Reason / purpose:
read-across source
Reason / purpose:
read-across source
GLP compliance:
yes (incl. certificate)
Salinity:
not applicable
Duration:
48 h
Dose descriptor:
EC50
Effect conc.:
81 mg/L
Nominal / measured:
nominal
Conc. based on:
test mat.
Remarks:
but exposure is to hydrolysis products
Basis for effect:
mobility
Remarks on result:
other: 59-108 mg/L
Remarks:
Source: Hüls 1995
Duration:
48 h
Dose descriptor:
EC50
Effect conc.:
90 mg/L
Nominal / measured:
nominal
Conc. based on:
test mat.
Remarks:
but exposure is to hydrolysis products
Basis for effect:
mobility
Remarks on result:
other: 77-110 mg/L
Remarks:
Source: Springborn Smithers 2002
Duration:
48 h
Dose descriptor:
EC50
Effect conc.:
37 other: PPM
Nominal / measured:
nominal
Conc. based on:
test mat.
Remarks:
but exposure is to hydrolysis products
Basis for effect:
mobility
Remarks on result:
other: 95% C.I>, 16-75 ppm
Remarks:
Source: Dow Corning 1978
Endpoint:
short-term toxicity to aquatic invertebrates
Type of information:
experimental study
Adequacy of study:
supporting study
Study period:
2002-01-23 to 2002-01-25
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to
Guideline:
OECD Guideline 202 (Daphnia sp. Acute Immobilisation Test)
Qualifier:
according to
Guideline:
EU Method C.2 (Acute Toxicity for Daphnia)
Qualifier:
according to
Guideline:
EPA OPPTS 850.1010 (Aquatic Invertebrate Acute Toxicity Test, Freshwater Daphnids)
GLP compliance:
yes (incl. certificate)
Analytical monitoring:
no
Vehicle:
yes
Details on test solutions:
PREPARATION AND APPLICATION OF TEST SOLUTION

- Method: A 1.0 mg/ml stock solution was prepared by placing 2.450 ml (2.5186g based on a density of 1.028 g/ml) of aminosilane in a 3.8-litre glass jar and diluting with 2500 ml of dilution water containing 0.250 ml dimethylformamide (DMF, CAS # 68-12-2). The solution was stirred for approximately 5 minutes with a magnetic stir bar and stir plate. Each test concentration was prepared by adding the appropriate amount of the 1.0 mg/ml stock solution to an intermediate vessel and diluting to 1000 ml with dilution water.
Test organisms (species):
Daphnia magna
Details on test organisms:
- Source, supplier, any pretreatment, breeding method: Springborn Smithers culture facility. Daphnids were cultured in 1.0-L glass vessels containing 0.80 L of water.

- Culture medium: Water used to culture the daphnids was be prepared in the same manner and has the same characteristics as the dilution
water.

- Feeding: Daphnids were fed a unicellular green algae, Ankistrodesmus falcatus (4 x 107 cells/mL) and YCT (yeast, cereal leaves and flaked fish food) suspension, daily, at a rate of 1 mL algae and 0.5 mL YCT solution per vessel per day.

- Test organisms: Daphnids were obtained by removing all immature daphnids from the culture vessel, thus isolating mature gravid daphnids #24 hours prior to initiating the test. Young produced by these organisms were subsequently pipetted into the test beakers.

- Age of test organisms at study initiation: < 24 hours
Test type:
static
Water media type:
freshwater
Limit test:
no
Total exposure duration:
48 h
Hardness:
The dilution water had a total hardness and alkalinity as CaCO3 of 170 mg/l and 120 mg/l, respectively
Test temperature:
20 to 21 °C
pH:
pH measured in the dilution water and solvent control vessels was 8.0 and 7.9 respectively, at test initiation and 7.9 and 8.0 respectively, at test termination.
Dissolved oxygen:
The dilution water and solvent control vessels had a measured DO concentration of 8.9 and 8.7 mg/l respectively, at test initiation and 8.2 and 8.3 mg/l respectively, at test termination.
Salinity:
Not applicable
Nominal and measured concentrations:
Nominal test concentrations: 0 (Control), 0 (Solvent control) 63, 130, 250, 500 and 1000 mg/l
Details on test conditions:
Test vessels: The toxicity test was conducted in 250-ml glass beakers, each containing 200 ml of test solution.

- Replication: Four replicate test vessels were established for each treatment level and a dilution water and solvent control. Twenty daphnids were
impartially selected and distributed to each concentration and the controls (five daphnids per replicate vessel).

- Aeration: No aeration was provided to the test vessels.

- Dilution water source: Fortifying well water based on the formula for hard water (U.S. EPA, 1975).

- Dilution water chemistry (hardness, alkalinity, pH, TOC, TSS, salinity, Ca/Mg ratio, Na/K ratio): The dilution water had a total hardness and alkalinity as CaCO3 of 170 mg/l and 120 mg/l, respectively, a pH of 7.8 and a specific conductivity of 500 μmhos/cm. The TOC concentration of the dilution water source was 0.60 mg/l for the month of January 2002.

- Lighting (quality, intensity, and periodicity): The test area was illuminated with Sylvania Octron® fluorescent bulbs at an intensity range of 70 to 90 footcandles at the solutions' surface. The test area received a regulated photoperiod of 16 hours of light and 8 hours of darkness. Sudden transitions from light to dark and vice versa were avoided. Light intensity was measured once during the test.

- Element (unit) basis (i.e., immobilization): Immobilization
Reference substance (positive control):
no
Duration:
48 h
Dose descriptor:
EC50
Effect conc.:
90 mg/L
Nominal / measured:
nominal
Conc. based on:
test mat.
Remarks:
but exposure is to hydrolysis products
Basis for effect:
mobility
Remarks on result:
other: 77-110 mg/L
Duration:
48 h
Dose descriptor:
NOEC
Effect conc.:
< 63 mg/L
Nominal / measured:
nominal
Conc. based on:
test mat.
Remarks:
but exposure is to hydrolysis products
Basis for effect:
mobility
Details on results:
- Control response; No immobilization or adverse effects were observed in daphnids exposed to the control or solvent control.

- Cumulative immobilization in the treated media: 10, 90, 100, 100 and 100% immobilization was observed among daphnids exposed to the 63, 130, 250, 500, and 1000 mg/l treatment level, respectively.
Reported statistics and error estimates:
The 48-hour EC50 for aminosilane and daphnids was calculated using probit analysis. The NOEC was determined directly from the raw data.

Table 1. Test results

 

Nominal concentration (mg/l)

Mean percentage immobilisation after 24 hours

Mean percentage immobilisation after 48 hours

0 (Control)

0

0

0 (Solvent control)

0

0

63

5

10

130

30*

90**

250

100

100

500

100

100

1000

100

100

*All surviving daphnids were observed to be lethargic

** All surviving daphnids were observed to be lethargic and swimming on the bottom of the test vessel.

Validity criteria fulfilled:
yes
Conclusions:
A 48-hour EC50 value of 90 mg/l and NOEC of <63 mg/l have been determined for the effects of the test substance on mobility of Daphnia magna. The results are expressed relative to nominal concentrations of the test substance. However the substance is subject to rapid hydrolysis and under the test conditions it is therefore likely that exposure will have been to its hydrolysis products (methanol and trisilanols).
Endpoint:
short-term toxicity to aquatic invertebrates
Type of information:
experimental study
Adequacy of study:
supporting study
Study period:
Not reported
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
other: Guideline study with acceptable restrictions. The study was not conducted under GLP and exposure concentrations were not measured.
Qualifier:
according to
Guideline:
other: EPA-660/3-75-009 (USEPA 1975)
GLP compliance:
no
Analytical monitoring:
no
Vehicle:
no
Details on test solutions:
PREPARATION AND APPLICATION OF TEST SOLUTION

- Dosing solutions: no dosing solutions used; neat test material added directly to exposure vessels

- Carrier solvent: none

- Controls: Dilution water
Test organisms (species):
Daphnia magna
Details on test organisms:
- Test system: Daphnia magna neonates (age not documented) from laboratory cultures (original source not documented) maintained under testing conditions
Test type:
static
Water media type:
freshwater
Limit test:
no
Total exposure duration:
48 h
Test temperature:
23 ± 1°C in environmental chamber
pH:
Not reported
Dissolved oxygen:
Not reported
Salinity:
Not applicable
Nominal and measured concentrations:
Nominal concentrations: 0 (Control), 10, 100, 1000, 10,000 ppm (mg/l)

Concentrations not analytically verified
Details on test conditions:
- Test design: static exposure, no solution renewal dilution water: reconstituted hard-water; glass-distilled water reconstituted with 192 mg/l NaHCO3, 120 mg/l CaSO4, 120 mg/l MgSO4, and 8 mg/l KCl (pH adjusted to 7.6 -8.0 with NaOH)

- Water chemistry: not documented

- Test substance stability: test substance not stable in aqueous solutions; estimated hydrolysis half-life < 10 min at pH 7

- Exposure vessel: 250-ml glass beakers containing 200 mL of dilution water; vessels aerated prior to but not after study initiation; vessels covered with Saran WrapÒ during exposure

- Replication: duplicate controls and exposure concentrations

- Loading of test organisms: 10 organisms per exposure vessel; total of 100 organisms

- Observations: 0, 24, 48 h after study initiation

- Photo-period: 18-h light/6-h dark; 600 foot-candle
Reference substance (positive control):
no
Duration:
48 h
Dose descriptor:
EC50
Effect conc.:
37 other: ppm
Nominal / measured:
nominal
Conc. based on:
test mat.
Remarks:
but exposure is to hydrolysis products
Basis for effect:
mobility
Remarks on result:
other: 95% C.I>, 16-75 ppm
Duration:
48 h
Dose descriptor:
NOEC
Effect conc.:
< 10 other: ppm
Nominal / measured:
nominal
Conc. based on:
test mat.
Remarks:
but exposure is to hydrolysis products
Basis for effect:
mobility
Details on results:
- Controls: One immobilization (5%) observed in controls at 24 and 48 hours.
Reported statistics and error estimates:
Not reported

Table 1. Test results

 

Nominal concentration (ppm)

Number alive at 0 hours

Number alive at 24 hours

Number alive at 48 hours

0 (Control)

20

19

19

10

20

19

15

100

20

11

7

1000

20

0

0

10000

20

0

0

 

Validity criteria fulfilled:
yes
Conclusions:
A 48-hour EC50 value of 37 ppm and NOEC of <10 ppm have been determined for the effects of the test substance on mobility of Daphnia magna. The results are expressed relative to nominal concentrations of the test substance. However the substance is subject to rapid hydrolysis and under the test conditions it is therefore likely that exposure will have been to its hydrolysis products (methanol and trisilanols).

Description of key information

EC50 (48-h): 81 mg/l mobility Daphnia magna, (Hüls AG, 1995)

Key value for chemical safety assessment

Additional information

Measured data was not available for N-[3-(dimethoxymethylsilyl)-2-methylpropyl]ethylenediamine (CAS 023410-40-4), therefore read across from the comparable substance, N-(3-(trimethoxysilyl)propyl)ethylenediamine (CAS 1760-24-3) was deemed acceptable for assessment.

A 48-hour EC50 value of 81 mg/l and NOEC of 35 mg/l have been determined for the effects of the test substance on mobility of Daphnia magna. The results are expressed relative to nominal concentrations of the test substance. However the substance is subject to rapid hydrolysis and under the test conditions it is therefore likely that exposure will have been to its hydrolysis products (methanol and N-(3-(trihydroxysilyl)propyl)ethylenediamine). This result has been selected as the lowest EC50value for effects on mobility from two reliable studies. The other EC50 value was 90 mg/l and the corresponding NOEC was <63 mg/l.

Another study determined an EC50 value of 37 ppm and a NOEC of <10 ppm.