4-[(4-ethoxyphenyl)amino]-N,N-dimethyl-3-nitrobenzenesulphonamide

Short-term toxicity to aquatic invertebrates

Link to relevant study record(s)

Reference

Endpoint:

short-term toxicity to aquatic invertebrates

Type of information:

other: read-across from supporting substance (structural analogue or surrogate)

Adequacy of study:

key study

Study period:

From November 2, 1993 to November 4 , 1993

Reliability:

2 (reliable with restrictions)

Rationale for reliability incl. deficiencies:

guideline study with acceptable restrictions

Remarks:

The test was conducted on a similar substance. The complete justification for the read across is attached at section 13.

Qualifier:

according to guideline

Guideline:

EU Method C.2 (Acute Toxicity for Daphnia)

Deviations:

yes

Remarks:

(only three concentrations were tested)

Qualifier:

according to guideline

Guideline:

OECD Guideline 202 (Daphnia sp. Acute Immobilisation Test)

Deviations:

yes

Remarks:

(only three concentrations were tested)

Principles of method if other than guideline:

Internal method SAV: 14 000 02 with deviation.

GLP compliance:

yes (incl. QA statement)

Analytical monitoring:

yes

Details on sampling:

All test medium samples for the analytical determinations were taken of the test solutions from the approximate center of the test vessels ( without mixing the medium) and kept at -18 °C to -25 °C until analysis.

Vehicle:

no

Details on test solutions:

Stock solution: 0.5 g test substance were mixed with 200 mL test medium and fill up to 500 mL with test medium. The stock solution was homogenized for 10 minutes in the ultrasonic bath.
Test concentrations: Based on a pretest, the test concentrations were chosen as 58, 100 and 180 mg/L nominal. At the end of the exposure in all test concentrations a slightly to clearly deposit on the bottom of the test vessels was observed.

Test organisms (species):

Daphnia magna

Details on test organisms:

Test organism: The Daphnia were bred in the testing facility of the Product Ecology TF, Textile Dyes Division under standardized conditions.
Breeding : Cultures of Daphnia magna are maintained in glass vessels containing aprox. 3 L of reconstituted water at 18-22 °C. The water was renewed partially three times weekly. The Daphnia were feed with a suspension of green algae ( Scenedesmus subspicatus ) supplemented by a suspension of Tetramin-extract in such quantities that the food was consumed within 24 h.
Pretreatment: 24 h before the start of the exposure reproductive Daphnia were separated from the young Daphnia by sieving all individuals through a 710 µm sieve. The quality of the Daphnia is checked at least every 3 months by determining the EC50 values (24 h) for potassium dichromate (range: 0.8 -1.5 mg/L). For each concentration, of test substance, 20 Daphnia divided in two groups of 10 animals are used.

Test type:

static

Water media type:

freshwater

Limit test:

no

Total exposure duration:

48 h

Remarks on exposure duration:

None

Post exposure observation period:

No data

Hardness:

136 mg/L CaCO3

Test temperature:

21 ⁰C

pH:

7.8-8.2

Dissolved oxygen:

Saturated

Salinity:

No data

Nominal and measured concentrations:

Nominal: 0, 58, 100 and 180 mg/L
Measured: 0, 66, 79 and 148 mg/L

Details on test conditions:

Experimental conditions: 48 h at 21 °C, 16 h light/8 h dark
The Daphnia were exposed to the test substance in 250 mL beakers containing 100-200 mL test medium with 10 animals per beaker. All tests are run in duplicate. During exposure the animals were kept at 21±1 °C with 16 h illumination.

Reference substance (positive control):

yes

Remarks:

Potassium dichromate

Duration:

48 h

Dose descriptor:

EC50

Effect conc.:

> 180 mg/L

Nominal / measured:

nominal

Conc. based on:

test mat.

Basis for effect:

mobility

Duration:

48 h

Dose descriptor:

EC50

Effect conc.:

> 148 mg/L

Nominal / measured:

meas. (arithm. mean)

Conc. based on:

act. ingr.

Basis for effect:

mobility

Details on results:

In the control and in all test concentrations no immobilization of the Daphnia was observed after 48 h.

Analytical results of the test substance:

Concentration start			Concentration end
Nominal concentration mg/L	mg/L	% of nominal	mg/L	% of nominal	Average concentration mg/L
58	72	124.1	59	101.7	66
100	86	86	71	71	79
180	161	89.4	135	75	148

Validity criteria fulfilled:

yes

Conclusions:

Under the test conditions, the measured 48 h EC50 of the test substance to Daphnia magna for immobilisation could not be identified and must be >148 mg/L (i.e., ca. >163 mg a.i./L).

Executive summary:

The acute toxicity of the test substance to Daphnia magna was determined in a 48 h static test according to OECD Guideline 202 and EU Method C.2 in compliance with GLP.

Daphnia were exposed to nominal concentrations of 0, 58, 100 and 180 mg/L for 48 h under static test conditions. Animals were observed for immobilization after 0, 24 and 48 h. Potassium dichromate was used as positive control. Test substance concentrations were verified analytically at study start and end.

Measured test substance concentrations were in the range of 71 -124 % of nominal values, corresponded to 66, 79 and 148 mg a.i./L. Under the study conditions, the 48 h EC50 was higher than the highest dose tested, i.e. > 180 mg/L (nominal) or > 148 mg/L (mean measured).

Description of key information

EC50(48h)  > 180 mg/l.

Key value for chemical safety assessment

Fresh water invertebrates

Fresh water invertebrates

Effect concentration:

180 mg/L