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Short-term toxicity to aquatic invertebrates

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Description of key information

No adverse effects were seen at the limit of solubility

Key value for chemical safety assessment

Additional information

In the acute immobilisation test with Daphnia magna (STRAUS), the effects of the test item Disperse Yellow DYLA 1306 were determined according to EPA OPPTS Draft Guideline 850.1010 (1996) and OECD 202 (2004) which is equivalent to the Council Regulation (EC) No.440/2008 Method C.2 (2008).

 

The study was conducted under static conditions over a period of 48 hours with a saturated solution with a nominal loading of 5.00 mg/L of the test item Disperse Yellow DYLA 1306 and further dilution levels in a geometric series with a separation factor of 2 (nominal loading rates of 0.313 to 2.50 mg/L).

 

The test item Disperse Yellow DYLA 1306 is a red powder and has a water solubility of < 15 µg/L. The saturated solution with a nominal loading of 5.00 mg/L of the test itemwas prepared with dilution water one day before the start of the exposure (at -24 hours) and was used for testing and as stock solution for the preparation of all further tested dilution levels. A test item dispersion of 5 mg/L was stirred with approximately 1100 rpm for 24 hours at room temperature. After completion of stirring, the test item dispersion was filtered with a membrane filter (0.2 µm, RC,Macherey-Nagel)to achieve the saturated solution. Further dilution levels were prepared by diluting the saturated solution with dilution water.The tested solutions were visually clear throughout the exposure period.Twenty daphnids were exposed to each concentration level and the control.

 

The concentrations of the test item Disperse Yellow DYLA 1306 in the saturated solution and in the controlwereanalytically verified via HPLC-UV at the start of the exposure (0 hours).

 

The measured concentrations of the test item at the start of the exposure (0 hours) were below the LOQ (< 0.03 mg/L of the test item) in the saturated solution and in the control. Concentrations of the test item in all tested loading levels were considered to be all below the LOQ throughout the exposure. Due to this fact, analytical monitoring of the other dilution levels at the start of the exposure and the analytical monitoring of all loading levels at the end of the exposure was not carried out in agreement with the sponsor.

 

According to OECD Guidance Document No 23 (2000) if an effect cannot be detected in a test with a saturated solution the result has to be reported as no toxic effects at saturation. Therefore,exposuresare expressed in terms of the original concentration of the test item in water at the start of the mixing period (loading rate) irrespective of the actual concentration of the test item in thesaturated solution.The EL-values are presented in the table below.

 

The water quality parameters (i.e. pH-value and dissolved oxygen concentration), measured at the start (0 hours) and at the end of the exposure (48 hours), were within the acceptable limits. The validity criteria of the test guidelines were fulfilled.

At the saturated solution with a nominal loading of 5.00 mg/L of the test item Disperse Yellow DYLA 1306 and at any of the tested dilution levels, no significant effects were observed on Daphnia magna

EL-Values, NOEL and LOEL

(based on the nominal loading rate of the test item in the saturated solution)

Endpoints

 

 

Test duration

[h]

Disperse Yellow DYLA 1306

Nominal loading rate

of the test item in the saturated solution

[mg/L]

EL10/ EL50/ EL100

24

> 5.00

48

> 5.00

NOEL

48

  5.00

LOEL

48

> 5.00