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Short-term toxicity to aquatic invertebrates

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Description of key information

The acute toxicity of Coco AAPB to Daphnia magna was investigated in four studies conducted according to OECD guideline 202. The study with the lowest 48 h EC50 was selected as key study. Additional data were available for C8-18 AAPB from an OECD 202 guideline study with Daphnia magna. The acute toxicity of Coco AAPB to the marine copepod Acartia tonsa was investigated in a study conducted according to ISO 14669 (1999) Water 
Quality - Determination of the acute lethal toxicity to marine capepods (Copepoda; Crustacea).

Key value for chemical safety assessment

EC50/LC50 for freshwater invertebrates:
1.9 mg/L
EC50/LC50 for marine water invertebrates:
7 mg/L

Additional information

Short-term toxicity to aquatic invertebrates

Reliable results on the acute toxicity of Coco AAPB and C8-18 AAPB to fresh water and of Coco AAPB to salt water invertebrates obtained in guideline studies are available. The obtained results were considered to be valid for the AAPBs.

Freshwater invertebrates

After an exposure period of 48 h, EC50values of 1.9, 4.1 and 6.6 mg a. i./L nominal were determined for Coco AAPB and 6.5 mg a.i./L nominal for C8-18 AAPB, respectively. Studies were conducted according to OECD 202 and/or EU Method C.2. Two static tests were conducted with analytical monitoring of test substance concentration and one test was performed under semi-static conditions. The stability of the test compound during the exposure period could be shown by analytical monitoring (photometer and TOC analysis, respectively). The effective concentrations were > 80 % of the nominal concentration with one exception: in the study conducted with C8-18 AAPB, only 72 % of initial nominal concentration was detected at day 0 at a concentration of 6.25 mg product/L. The pH was adjusted in two studies according to guideline. In the other studies, the pH was not adjusted or no information is available with respect to this. The pH values of these studies, however, were in the acceptable range (7.6 -8.4).

The lowest 48 h EC50, determined to be ca. 1.9 mg a. i./L nominal was used for further assessment.

Marine invertebrates

The acute toxicity of Coco AAPB to the marine copepod Acartia tonsa was investigated in a study conducted according to ISO 14669 (1999) Water Quality - Determination of the acute lethal toxicity to marine capepods (Copepoda; Crustacea). Acartia tonsa were exposed to nominal Coco AAPB static conditions for 48 h. The 48 h NOEC and LC50values were determined to be 3.6 mg a. i./L and 7.0 mg a. i./L nominal, respectively. The 48 h LC50of 7.0 mg a. i./L nominal was used for further assessment.