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Bull Environ Contam Toxicol. 2007 Jun;78(6):510-4. Epub 2007 May 22.

Acute and sub-lethal toxicity of three POEA surfactant formulations to Daphnia magna.

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The Institute of Environmental and Human Health, Department of Environmental Toxicology, Texas Tech University, Lubbock, TX 79409, USA.


Polyethoxylated tallowamine (POEA) is a non-ionic surfactant used in many herbicide formulations to increase the ability of active ingredients to penetrate leaf cuticles. However, it has also been shown to disrupt respiratory membranes in aquatic organisms. In this study, Daphnia magna was used to examine the lethal and sub-lethal toxicity of three POEA formulations consisting of 5:1, 10:1, and 15:1 average oxide:tallowamine. The formulation consisting of 10:1 was the most acutely toxic with a 48-h LC50 value of 97.0 microg/L and 15:1 was least toxic at 849.4 microg/L. All formulations inhibited growth at concentrations between 100 and 500 microg/L.

[Indexed for MEDLINE]

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