Summary
The acute toxicity of three commercial phosphate ester mixtures (hydraulic fluids) was tested against two invertebrates and four fishes. Pydraul 50E was more toxic than Houghtosafe 1120 in static and flow-through tests; Pydraul 115E was the least toxic. In flow-through tests these phosphate esters were less acutely toxic than PCB's. However, sublethal reactions to the phosphates suggest a need for chronic toxicity studies.
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Nevins, M.J., Johnson, W.W. Acute toxicity of phosphate ester mixtures to invertebrates and fish. Bull. Environ. Contam. Toxicol. 19, 250–256 (1978). https://doi.org/10.1007/BF01685794
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DOI: https://doi.org/10.1007/BF01685794