Aminomethylphosphonic acid

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Aminomethylphosphonic acid
Aminomethylphosphonic acid.svg
IUPAC name
(Aminomethyl)phosphonic acid
Other names
Aminomethanephosphonic acid
3D model (JSmol)
Abbreviations AMPA; AMeP
ECHA InfoCard 100.152.014 Edit this at Wikidata
  • InChI=1S/CH6NO3P/c2-1-6(3,4)5/h1-2H2,(H2,3,4,5)
  • InChI=1/CH6NO3P/c2-1-6(3,4)5/h1-2H2,(H2,3,4,5)
  • O=P(O)(O)CN
Molar mass 111.037 g·mol−1
Appearance Solid
Melting point 338 to 344 °C (640 to 651 °F; 611 to 617 K)
Acidity (pKa) 0.4
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Infobox references

Aminomethylphosphonic acid (AMPA) is a weak organic acid with a phosphonic acid group. It is one of the primary degradation products of the herbicide glyphosate.[1] AMPA has toxicity which is comparable to that of glyphosate and it is therefore considered to be of similar toxicological concern (harmful in greater than 0.5 parts per million) as glyphosate itself.[2] AMPA has the potential to be broken down further by manganese oxide in laboratory conditions, however in soil manganese oxide is usually only present in trace amounts.[3] Microbial degradation of AMPA is the more likely degradation pathway, where it degrades into phosphoric acid[4][5] and ultimately to carbon dioxide and inorganic phosphate.[6]

Structures of AMPA in different pH ranges[7]


  1. ^ Environmental Fate of Glyphosate Archived 2012-04-20 at the Wayback Machine, Jeff Schuette, Department of Pesticide Regulation, California
  2. ^ Pesticide Residues in Food - 1997, FAO Panel of Experts on Pesticide Residues in Food and the Environment and the WHO Core Assessment Group
  3. ^ K. A. Barrett and M. B. McBride. Oxidative Degradation of Glyphosate and Aminomethylphosphonate by Manganese Oxide. Environ. Sci. Technol., 2005, 39 (23), pp 9223–9228
  4. ^ Pipke R, Amrhein N. (1988) Isolation and characterization of a mutant of Arthrobacter sp. strain GLP-1 which utilizes the herbicide glyphosate as its sole source of phosphorus and nitrogen. Applied and Environmental Microbiology 54(11): 2868-2870.
  5. ^ Forlani G, Mangiagalli A, Nielsen E, Suardi CM. (1999) Degradation of the phosphonate herbicide glyphosate in soil: Evidence for a possible involvement of unculturable microorganisms. Soil Biology and Biochemistry 31: 991-997
  6. ^ Backgrounder: Glyphosate does not degrade to phosphorous acid in the environment. Monsanto. 2005
  7. ^ Zuliang Chen, Wenxiang He, Michael Beer, Mallavarapu Megharaj, Ravendra Naidu (2009-05-15). "Speciation of glyphosate, phosphate and aminomethylphosphonic acid in soil extracts by ion chromatography with inductively coupled plasma mass spectrometry with an octopole reaction system". Talanta. 78 (3): 852. doi:10.1016/j.talanta.2008.12.052.CS1 maint: multiple names: authors list (link)

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