n-(Phosphonomethyl)iminodiacetic acid

N-(Phosphonomethyl)iminodiacetic acid, commonly abbreviated as PMIDA or referred to by the trade designation MON 820, is a phosphonate-based chelating agent registered under CAS 5994-61-6 and EC 227-824-5. It carries no assigned E-code. The compound is a direct precursor and structural analogue of glyphosate, with a distinct phosphonomethyl-iminodiacetate backbone.

In water treatment, PMIDA sequesters calcium, magnesium, and heavy metal ions by forming stable coordination complexes, preventing scale deposition on equipment surfaces. In agrochemical manufacturing, it serves as a key synthetic intermediate in the production of glyphosate-based herbicides. Its buffering capacity also makes it applicable in textile processing baths where pH stability is required during dyeing operations.

PMIDA is supplied as a technical-grade crystalline solid and is subject to REACH registration requirements within the European Economic Area. Procurement quantities are typically available in multi-kilogram bags or bulk packaging. Buyers should request a full safety data sheet and certificate of analysis confirming purity and heavy metal content prior to ordering.