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Optimizing Design in Determination of Silicon Content in Ferromolybdenum by Molybdenum Blue Spectrophotometry

Optimizing design in determination of silicon content in ferromolybdenum by molybdenum blue spectrophotometry

A method to determine silicon content in ferromolybdenum by molybdenum blue spectrophotometry was established.The dissolve method was established by comparison different dissolve techniques combining with effect of matrix and impurity ion. Meanwhile,the effect of the dosage ammonium molybdate and ammonium ferrous sulfate as well as wavelength etc are studied. Under optimized conditions of molybdenum blue spectrophotometric apparatus,four samples are determined simultaneously. The recoveries rate ranges from 96.8% to 103.1% and the determination rate ranges from 0.016% to 2.5%.The proposed method meet the standard of GB/T 3649—2008.

Molybdenum blue is a term applied to:
1. Reduced heteropolymolybdate complexes, polyoxometalates containing Mo(V), Mo(VI), and a hetero atom such as phosphorus or silicon.
2. Reduced isopolymolybdate complexes, polyoxometalates containing Mo(V), Mo(VI) formed when solutions of Mo(VI) are reduced.

The "heteropoly-molybdenum blues", are used extensively in analytical chemistry and as catalysts. The formation of "isopoly-molybdenum blues" which are intense blue has been used as a sensitive test for reducing reagents. They have recently been shown to contain very large anionic species based on the so-called "big wheel" containing 154 Mo atoms, with a formula [Mo₁₅₄O₄₆₂H₁₄(H₂O)₇₀]¹⁴⁻.



 

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