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CAS number 1429-50-1 YesY
PubChem 15025
ChemSpider 14301 YesY
Jmol-3D images Image 1
Molecular formula C6H20N2O12P4
Molar mass 436.13
Appearance solid
Solubility in water limited
Except where noted otherwise, data are given for materials in their standard state (at 25 °C (77 °F), 100 kPa)
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Infobox references

EDTMP or ethylenediamine tetra(methylene phosphonic acid) is a phosphonic acid. It has chelating and anti corrosion properties. EDTMP is the phosphonate analog of EDTA.[1] It is classified as a nitrogenous organic polyphosphonic acid.

Properties and applications[edit]

EDTMP is normally delivered as its sodium salt, which exhibits good solubility in water.

Used in Water treatment as an antiscaling and anti corrosion agent, the corrosion inhibition of EDTMP is 3–5 times better than that of inorganic polyphosphate. It has good chemical stability and thermal tolerance. It shows excellent scale inhibition ability under temperature 200 °C. It functions by chelating with many metal ions.

The anti-cancer drug Samarium (153Sm) lexidronam is also derived from EDTMP.


  1. ^ Svara, J.; Weferling, N.; Hofmann, T. "Phosphorus Compounds, Organic," In 'Ullmann's Encyclopedia of Industrial Chemistry, Wiley-VCH, Weinheim, 2008. doi:10.1002/14356007.a19_545.pub2.