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Ecotoxicological information

Short-term toxicity to aquatic invertebrates

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Description of key information

The 48-hour EC50 of Triquat Monomer was calculated to be 63 (32) mg/L with 95% confidence limits of 53 (27) and 75 (38) mg/L. The values in parentheses refer to test substance dry matter.
Therefore, TRIQUAT monomer should be considered as harmful to the aquatic organisms tested.

Key value for chemical safety assessment

EC50/LC50 for freshwater invertebrates:
63 mg/L

Additional information

One reliable key study is available (Hoeger S, 2008) as described below:

The acute toxicity of the test substance Triquat Monomer to Daphnia magna was determined in a 48 hour static test according to EEC Directive 92/69, C.2 (1992), OECD Guideline No. 202 (2004) and GLP.

Due to the high water content of the test substance (50%), the highest test substance concentration tested was 200 mg/L to yield results corresponding to a dry matter concentration of the test substance of 100 mg/L. The nominal test substance concentrations tested were 9.3, 20, 43, 93, and 200 mg/L (corresponding to concentrations of 4.7, 10, 22, 47 and 101 mg/L test substance dry matter, respectively). Additionally, a control group was tested in parallel.

At the start and the end of the test, the analytically determined concentrations of the test substance in the test media were between 92 and 111% of the nominal values. Thus, the correct dosing of the test substance Triquat Monomer was confirmed. Furthermore, it was demonstrated that the test substance was stable during the test period, and the reported biological results are based on the nominal test substance concentrations.

The 24-hour EC50 of Triquat Monomer was calculated to be 149 (75) mg/L with 95% confidence limits of 127 (64) and 174 (87) mg/L. The 24-hour EC0 was 43 (22) mg/L.

The 48-hour EC50 of Triquat Monomer was calculated to be 63 (32) mg/L with 95% confidence limits of 53 (27) and 75 (38) mg/L. The 48 hour EC0 and the 48 hour NOEC were both 20 (10) mg/L, since no immobilisation was observed up to and including this test concentration. The 48-hour EC100 was 200 (101) mg/L. The values in parentheses refer to test substance dry matter.

Based on these results, TRIQUAT monomer should be considered as harmful to the aquatic organisms tested.