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Short-term toxicity to fish

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In a 96-h acute toxicity study, rainbow trout (Oncorhynchus mykiss) were exposed under static condition
to tetra-n-propylammonium bromide at nominal concentrations of 0 (blank), 0.1, 1, 10, 100 and 1000 mg/L in a range finding test, followed by a final test with 0 (blank) and 1000 mg/L.
Despite pH values slightly exceeding the protocol upper limit value, no effects on fish survival were observed. The 96h-LC50 is >1000 mg/L and the NOEC is 1000 mg/L.
Although the stability during 96 hours was demonstrated by analyses from the sponsor, the nominal test concentrations in the vessels during the study were not confirmed by analytical measurements. Therefore, the study is classified as reliable with restrictions.

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