6-Chloro-3-hydroxy-2-(5′-methylfuryl)-4H-chromene-4-one as an analytical reagent for micro determination of molybdenum(VI)

Abstract

6-Chloro-3-hydroxy-2-(5′-methylfuryl)-4H-chromene-4-one (CHMFC) has been used as an analytical reagent for the spectrophotometric determination of molybdenum. Molybdenum(VI) in the presence of several cations, anions and complexing agents forms a yellow 1:2 complex with CHMFC. The complex is quantitatively extractable into 1,2-dichloroethane from 1 mol dm-3 acetic acid medium and is stable for more than 6 h. The complex shows an absorption maximum at 438 nm with a molar absorptivity of 5.36 × 10 4 dm3 mol-1 cm-1 and Sandell's sensitivity equal to 0.0017 μg Mo cm-2. The method obeys Beer's law up to 1.9 μg Mo ml-1. The relative standard deviations are 0.2% for solutions and 0.5 - 1.5% for solid samples. The method is simple, selective, precise and rapid, and has been satisfactorily applied to the micro determination of molybdenum in various synthetic and standard samples.