John Wiley & Sons, Ltd.

Aminomethylphosphonic acid (AMPA) has low chronic toxicity to Daphnia magna and Pimephales promelas

Aminomethylphosphonic acid (AMPA) is the simplest member of a class of compounds known as aminomethylenephosphonates and the only environmental metabolite measured in significant amounts during the degradation of the herbicide glyphosate in soil. However, there are additional sources of AMPA in the environment, originating from organic phosphonates which are used in water treatment to inhibit scale formation and corrosion. AMPA, like glyphosate, has low acute toxicity to aquatic animals and the no observed adverse effect concentration (NOAEC) obtained from a fish full life cycle study for glyphosate was determined to be 26 mg/L. However, the chronic toxicity of AMPA to aquatic animals has not been evaluated before this study. The purpose of this investigation was to assess the potential for chronic toxicity of AMPA to fathead minnow (Pimephales promelas) and Daphnia magna. Chronic toxicity to P. promelas was evaluated in a fish early life‐stage study. The primary endpoints were larval survival, growth and development. The NOAEC for P. promelas was determined to be 12 mg/L, the highest concentration tested. The chronic toxicity to D. magna was evaluated in a Daphnia reproduction test. The primary endpoints were survival, growth and reproduction. The NOEC for D. magna was determined to be 15 mg/L. Conservatively predicted environmental surface water concentrations for AMPA from typical foliar agricultural application rates and values from surface water monitoring programs are 100‐1000 times less than the NOAEC values from both studies. Consequently, there is a large and highly protective margin of safety between realistic environmental exposures to AMPA and chronic toxicity to aquatic vertebrates and invertebrates. This article is protected by copyright. All rights reserved

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