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Two acute aquatic toxicity tests on aquatic invertebrates (daphnia magna) and aquatic algae ( Pseudokirchneriella subcapitata) were negative with regards to acute aquatic toxicity for thioacid.

No concentration related immobility of Daphnia magna was observed in the control and all exposure concentrations during the range-finding limit test. As there was no immobility observed during the range-finding limit test, the 48-hour EC50 value and the corresponding no observed effect concentration (NOEC) for Daphnia magna exposed to Thio-Acid could not be determined. Therefore, the 48-hour EC50 value is considered to be >100mg/L, the highest nominal exposure concentration tested in the range-finding limit test.

The effect of the test item on the growth of Pseudokirchneriella subcapitata has been investigated over a 72-Hour period and based on the geometric mean measured test concentrations gave the following results:

Growth rate: EC50 : 53 mg/l, NOEC : 18 mg/l, LOEC : 58 mg/l

Yield: EC50 : 35 mg/l, NOEC : 18 mg/l, LOEC : 58 mg/l

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