Registration Dossier

Ecotoxicological information

Endpoint summary

Administrative data

Description of key information

Additional information

Based on the overall information available for thioglycolic acid, its salts but also oxidation product, the substances can be considered as of low toxicity for aquatic species. The available information information available for the acidic form allows to conclude that thioglycolic acid is harmful to Daphnia magna only. Acute ecotoxicity knowledge is strengthened by information existing on diammonium dithioglycolate which is the main degradation product of thioglycolic acid. Diammonium dithioglycolate occurs rapidly in the environment based on practical case (Devaux, 2003) and therefore is a good surrogate for thioglycolic acid ecotoxicity. On this basis one can conclude that thioglycolic acid is neither toxic nor harmful for algae. Diammonium dithioglycolate data also exists for Daphnia and demonstrates that this form is neither toxic nor harmful for Daphnia. One could consider that thioglycolic acid is also of no concern for Daphnia based on its half-life in water. Nevertheless as valid data exists on the thioglycolicc acid, the applicant prefers to retain this result and concludes that thioglycolic acid is harmful to Daphnia.