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Ecotoxicological information

Short-term toxicity to fish

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Description of key information

96 h LC50 130 mg active acid/L, S. maximus, reliability 2 (AnalyCen 2002a)
96 h LC50 440 mg active acid/L, O. mykiss, reliability 2 (ABC 1979, read-across from HMDTMP acid)

Key value for chemical safety assessment

LC50 for freshwater fish:
440 mg/L
LC50 for marine water fish:
130 mg/L

Additional information

A 96 h LC50 value of 300 mg/l test substance, equivalent to 130 mg active acid/L, have been reported for the effects of the test ubstance on the mortality of the marine fish Scopthalamus maximus. 100% mortalities were recorded in the highest test concentration (1000 mg/l test substance) but these are thought to relate to the low pH recorded, pH 3.6, rather than to relfect the true toxicity of the test substance.

No data are available on the short-term toxicity of BHMT (CAS 34690-00-1) with freshwater fish, however data are available with the structurally analogous substance HMDTMP acid (CAS 23605-74-5), see Aquatic toxicity endpoint summary for a justification of read-across. A 72 h and 14 d LC50 value of 440 mg active acid/l have been determined for the effects of the test substance on the mortality of the freshwater fish Oncorhynchus mykiss (reported as Salmo gairdneri) based on arithmetic mean measured concentrations. A 14 d NOEC value of 232 mg/l based on mortality was also reported in the same study (ABC 1979).