Abstract
A simple, sensitive and selective spectrophotometric method for determination of molybdenum is described. A solution containing 100 μg of Mo in 2.5 M hydrochloric acid is treated with ascorbic acid and ammonium thiocyanate and after standing for 8 min is shaken with an equal volume of ethyl methyl ketone for 30 sec. The absorbance of the complex is measured at 465 nm against a reagent blank. The complex is stable for 1 hour. There is no interference from Re(VII), SO 2− 4, Cl −, CH 3COO −, PO 3− 4, NO − 3, C 2O 2− 4, citrate or tartrate, and at least 5 mg of U(VI), 10 mg of Cr(III, VI), Th, or Ni, and 20 mg of W(VI) Can be tolerated. Vanadium(V) interferes at the 500 μg level, and fluoride slightly decreases the absorbance.
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