Molybdenum in Alloy Steels
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- Category: Molybdenum knowledge
- Published on 04 July 2013
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A highly selective extractive spectrophotometric method for micro-determination of molybdenum has been presented. Employing ascorbic acid as a reductant, Mo(VI) was reduced to Mo(V) at the room temperature in 1 mol L-1 H2SO4.
The obtained Mo(V) formed a yellow-colored (1:2) complex with 3-hydroxy-2-(4-methoxyphenyl)-6-propionyl-4-oxo-4H- 1-benzopyran (HMPB). The complex was quantitatively extracted to 1,2-dichloroethane and absorbance of the extract was measured at 414 run.
The relative standard deviation and coefficient of variance were +/- 0.0025 (in absorbance units) and +/- 0.25% for 10 replicate determinations of 1 mu g mL(-1) analyte.
The method was free from the interference from a large number of analytically important elements and has been applied satisfactorily to the determination of molybdenum in various synthetic, environmental, and technical samples with the improved accuracy and precision.
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