phosphotungstovanadic acid

Etymology
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Noun

 * 1)  Any of various heteropoly acids composed of phosphorus, tungsten, vanadium, and oxygen.
 * 2) * 1957, U.S. Atomic Energy Commission, ‎Michael A. De Sesa, Raw Materials Development Laboratory Handbook of Analytical Methods (page 136)
 * Vanadium (V) in an acid solution forms the yellow phosphotungstovanadic acid upon the addition of phosphoric acid and sodium tungstate.