Molybdenum Blue


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Molybdenum Blue

 

a bright blue molybdenum-containing substance formed by the action of reducing agents (SO2, H2S, Zn, and glucose) on solutions of molybdic acid or acid solutions of molybdates. The term “molybdenum blue” is used to denote various compounds in which molybdenum occurs with an oxidation number of +5 or +6. Such substances are obtained as amorphous precipitates of varying composition—for example, Mo8O23·xH2O and Mo4O11xH2O. Molybdenum blue is readily adsorbed from colloidal solutions by plant and animal fibers, tinting them blue; this principle, in particular, is the basis of the silk-dyeing process. The reactions involved in the formation of molybdenum blue are widely used in analytical chemistry.

References in periodicals archive ?
Many authors have been concerned with the instability of molybdenum blue complex, {in the assaying of enzymes other than 5'-Nucletidase} and have added stabilizers to solution of reaction [10, 11].
Soluble phosphorus was determined via formation of molybdenum blue by reacting with ammonium molybdate, [([NH.
The effect of low-molecular-weight organic acids and inorganic phosphorus concentration on the determination of soil phosphorus by the molybdenum blue reaction.
Phosphorus in the soil extracts is usually measured colourimetrically, most commonly by the molybdenum blue method of Murphy and Riley (1962).
It is generally considered that analysis by ICP measures organic forms of P that may not be measured by the molybdenum blue method, which measures predominantly orthophosphate.