Ammonium heptamolybdate tetrahydrate

Ammonium heptamolybdate is the inorganic compound whose chemical formula is (NH4)6Mo7O24, normally encountered as the tetrahydrate. A dihydrate is also known. It is a colorless solid, often referred to as ammonium paramolybdate or simply as ammonium molybdate, although "ammonium molybdate" can also refer to ammonium orthomolybdate, (NH4)2MoO4, and several other compounds. It is one of the more common molybdenum compounds.


  • as an analytical reagent to measure the amount of phosphates, silicates, arsenates and lead in aqueous solution (e.g. pigments, river water, sea water etc.)
  • in the production of molybdenum metal and ceramics
  • in the preparation of dehydrogenation and desulfurization catalysts
  • in the fixing of metals
  • in electroplating
  • in fertilizers for crops.
  • as a negative stain in biological electron microscopy, typically in the 3–5% (vol/vol) concentration range and in the presence of trehalose; or at saturated concentration to perform cryo-negative staining.
  • For the detection of recreational drugs as a component of the Froehde reagent
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