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Short-term toxicity to fish

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Description of key information

OECD 203, GLP and Klimisch 1 Zebrafish LC50 7.07 mg/L, LC10 >5 <10 mg/L.

Key value for chemical safety assessment

Fresh water fish

Fresh water fish
Effect concentration:
7.07 mg/L

Additional information

The acute toxicity of the test item TOFA_DimerFA_TETA_PAA (batch no.: BB 001030 V1) to fish (zebrafish) was determined according to OECD-Guideline for Testing of Chemicals No. 203 (1992) at Dr.U.Noack-Laboratorien, 31157 Sarstedt, Germany. The study was performed in natural river water.

A semi-static test with renewal of the test media after 48 h was performed with the nominal concentrations of 0.625 - 1.25 - 2.50 - 5.00 - 10.0 mg/L. Duration of the test was 96 hours. 7 test organisms were exposed to each concentration level and the control. Water quality parameters pH-value, temperature and oxygen-saturation, measured after 0, 24, 48, 72 and 96 h, were determined to be within the acceptable limits.


TOFA_DimerFA_TETA_PAA has low water solubility and may sorb to organic and inorganic materials by different mechanisms. Due to these properties the test item was difficult to test in artificial water (e.g. sorption to the test organism and walls of the test vessel). Natural river water contains particulate as well as dissolved organic carbon to which the test item can sorb partially preventing that the test item settles onto surfaces. The sorbed fraction of the test item was difficult to extract from the test system which normally leads to low analytical recoveries. Nevertheless the test item was present in the test system and therefore available for exposure (dissolved in water and sorbed).

No determinations of the test item concentrations were carried out. Preliminary investigations including the use of different analytical techniques have shown that no specific method was available that met the required sensitivity in the range of the test concentrations.


All effect levels are given based on nominal concentrations of TOFA_DimerFA_TETA_PAA.

TOFA_DimerFA_TETA_PAA was found to be toxic to zebrafish after 96 h at a concentration of 10.0 mg/L. The LC50 after 96 h was 7.07 mg/L and the NOEC after 96 h was 5.00 mg/L.