Molybdenum Blue


Also found in: Wikipedia.
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.

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.

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.
References in periodicals archive ?
Spectrophotometry Determination of Silicate with Molybdenum Blue. The amount of silicate in the PBS samples was determined using molybdenum blue chemistry [18,19], which is illustrated in Figure 4.
After reacting the sample 10 minutes with oxalic acid, 0.5 mL of 2% ascorbic acid (Acros Organics) was added to reduce the silicomolybdic acid to the molybdenum blue complex.
In this work, the influence of synthesis and experimental parameters on the morphology and biodegradability of MSNPs was investigated by means of an optimized molybdenum blue chemistry and spectrophotometric analysis.
Broth P was determined by Molybdenum blue method [9].
The amount of soluble P released in the NBRIP broth by each of the 16 isolates was quantitatively measured by Molybdenum Blue method describes by Watanabe and Olsen in 1965.
The enzymatic reduction of molybdenum is molybdenum blue a colloid that does not pass through dialysis tubing.
Keywords: Agriculture; Molybdenum; Molybdenum blue; Dialysis tubing; Serratia sp.
After that, phosphomolybdate complex reduced to molybdenum blue, which can be measured colorimetrically at wavelength near 700 nm.
Soluble phosphorus was determined via formation of molybdenum blue by reacting with ammonium molybdate, [([NH.sub.4]).sub.6][Mo.sub.7][O.sub.24], and stannous chloride, Sn[Cl.sub.2], to form the brightly blue-colored heteropoly-molybdenum blue (Wei and others 2009).
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.