Phosphomolybdic acid solution

Phosphomolybdic acid solution (CAS 12026-57-2)

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Synonym: Masson Trichrome; Molybdophosphoric acid
Application: Water soluble compound used in chromatography, histology staning and spectrophotometry
CAS Number: 12026-57-2
Molecular Weight: 1825.25
Molecular Formula: 12MoO3•H3PO4
Supplemental Information: This is classified as a Dangerous Good for transport and may be subject to additional shipping charges.
* Refer to Certificate of Analysis for lot specific data (including water content).
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Phosphomolybdic acid solution is primarily used in spectrophotometric determination of phosphate ions. PMA is also component in the 3-color histology stain called Masson's trichrome; employed in the differentiation step, Phosphomolybdic acid is one of the solutions fixed tissues are immersed in prior to subsequent staining. Phosphomolybdic acid is also used as reagent for simple and rapid colorimetric determination of phenothiazine derivatives. PMA oxidizes the phenothiazine derivative to a cationic free radical, forming a coloured salt. A preliminary extraction is necessary if certain reductants (sulphite or ascorbic acid) are present as stabilizers, as they will reduce the reagent to phosphomolybdenum blue.
Also available as dry reagent: Phosphomolybdic acid hydrate (sc-215711)


1. Fujinaga, T., et al. 1971. Talanta. 18: 960-962. PMID: 18960967
2. Stan, M., et al. 1977. Talanta. 24: 140-142. PMID: 18962047
3. Li, Y., et al. 2009. Org. Lett. 11: 2691-2694. PMID: 19514796

Formulation :
20 % wt. in ethanol
Physical State :
Storage :
Store at 4° C
Boiling Point :
158° C at 760 mmHg
Density :
0.94 g/mL
For Research Use Only. Not Intended for Diagnostic or Therapeutic Use.
WGK Germany :
Transport :
UN 2924, Class 3(8), Packing group II
PubChem CID :
Merck Index :
13: 7428
MDL Number :
EC Number :

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Certificate of Analysis

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