2-(2-FURYL)-3-HYDROXY-4H-CHROMEN-4-ONE AS AN ANALYTICAL REAGENT FOR MOLYBDENUM(VI)

2-(2-Furyl)-3-hydroxy-4H-chromen-4-one (FHC) has been used as an analy tical reagent for the spectrophotometric determination of molybdenum. Molybdenum(VI) in the presence of several cations except Sb(V), Bi(III ), and Ce(IV), anions and complexing agents except oxalate forms a yel low 1:2 complex with FHC. The complex was extractable into chloroform from 0.01-0.25 mol dm-3 acetic acid (pH 4.2-2.9) and was stable for 2 h. The complex showed an absorption maximum at 414 nm with a molar abs orptivity of 4.99 x 10(4) dm3 mol-1 cm-1 and Sandell's sensitivity equ al to 0.0019 mug Mo cm-2. Beer's law was obeyed over the concentration range of 0-2.9 ppm. The equilibrium constant was found to be 6.70 x 1 0(-12). For 1 mug Mo cm-3 the standard deviation was 0.004 with a rela tive mean error of +/-0.7%. The method is simple, selective, precise a nd rapid and has been applied to the determination of molybdenum in sy nthetic and standard samples.