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Ecotoxicological information

Short-term toxicity to aquatic invertebrates

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Description of key information

48 h EC50 110 mg active acid/L, A. tonsa, reliability 2 (AnalyCen 2002b)
48 h EC50 570 mg active acid/L, D. magna, reliability 2 (Monsanto 1981, read-across from HMDTMP acid)

Key value for chemical safety assessment

EC50/LC50 for freshwater invertebrates:
570 mg/L
EC50/LC50 for marine water invertebrates:
110 mg/L

Additional information

A 96 h EC50 value of 110 mg active acid/L has been reported for the effects of the test substance on the mobility of the marine arthropod Acartia tonsa. The study was conducted according to ISO/CD 14669 and although it lacks reporting details it is considered to reliably indicate that the substance is of low short-term toxicity.

No data are available with the registered substance on freshwater invertebrate toxicity, however data are available with the closely related substance HMDTMP acid (CAS 23605-74-5); see Aquatic toxicity endpoint summary for the justification for read-across. A 48 h EC50 value of 570 mg active acid/L has been determined for the effects of the test substance on the immobility of the freshwater flea D. magna based on nominal concentrations (Monsanto 1981). The results indicate that the substance is of very low short-term toxicity to invertebrates. However, they should be treated with caution since the mortalities may be an effect of the pH of the test medium, rather than a reflection of true toxicity.