Extraction-spectrophotometric determination of molybdenum with toluene-3,4-dithiol

Abstract

A spectrophotometric method for the determination of molybdenum(VI) with toluene-3,4-dithiol in isobutyl methyl ketone is proposed. In acidic media the spectrum of the complex formed has a stable absorption maximum at 415 nm with a molar absorptivity of 7.5 × 10⁴ l mol^–1 cm^–1 in the range of optimum compliance with Beer's law, 0.25–1.25 µg ml^–1 of Mo. The effects of the concentration of reagent, acidity, time and temperature are reported, together with the reproducibility and precision of the method, its susceptibility to interferences and its application to the determination of molybdenum in steel.