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Trimethyl phosphate has been tested in a limited number of aquatic species (Selenastrum capricornutum, Daphnia magna and Oryzias latipes), under OECD test guidelines [OECD TG 201, 202, 203,].

Various NOEC and LC50 values were gained from above tests:

LC50 = > 1,050 mg/l (acute fish);

EC50 = > 1,000 mg/l (acute daphnia);

EC50 = > 1,000 mg/l (acute algae);

NOEC = 320 mg/l (longterm daphnia reproduction).

Therefore, the chemical is considered to be slightly toxic to daphnids and non-toxic to fish and algae.

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