Aminomethylphosphoric acid

A very useful, but difficult, case has been reported by Smith and Barclay (1992) for the recovery of Monsanto s highly successful herbicide, glyphosphate (N-phosphonomethyl-glycine, tradename Roundup), from an aqueous waste stream. This stream contains a lot of unwanted products like HCHO, HCOOH, aminomethylphosphoric acid, and N-phosphonomethyl iminodiacetic acid (PMIDA). The removal of PMIDA and HCOOH from glyphosphate is essential as HCOOH can react to give the formyl derivative. Amberlite IRA-93 and Amberlite IRA-68 (anionic resins) were chosen to separate glyphosphate from PMIDA and HCOOH, respectively (HCHO does not get adsorbed). 1500 recovery cycles were tried, and the resin has two years plant life scale-up with a factor of 90,000 was very successful. 

AMPA = aminomethylphosphoric acid, CZE = capillary zone electrophoresis, DAD = = diode array detector. MEKC =... 

Coutinho, C.F.B., Coutinho, L.F.M., Mazo, L.H. et al (2008) Rapid and direct determination of glyphosate and aminomethylphosphoric acid in water using anion-exchange chromatography with coulometric detection. J. Chromatogr. A, 1208, 246-249. 

S. Cancela and M. C. Yebra, Flow-injection flame atomic absorption spectrometric determination of trace amounts of cadmium in solid and semisolid milk products coupling a continuous ultrasound-assisted extraction system with the online preconcentration on a chelating aminomethylphosphoric acid resin, J. AOAC Internal., 2006, 89(1), 185-191. 

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See also in sourсe #XX -- [ ]

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