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 x 10(4) dm3 mol(-1) cm(-1) and Sandell's sensitivity equal to 0.0017 microg Mo cm(-2). The method obeys Beer's law up to 1.9 microg 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.
Molybdenum(V), obtained from Mo(VI) by reduction in presence of ascorbic acid in sulfuric acid medium, has been determined spectrophotometrically. Mo(V) formed an intense yellow 1 : 2 complex with 6-chloro-3-hydroxy-2-(5-methyl-2-furyl)-4H-chromen-4-one (CHMFC); the complex is extractable into 1,2-dichloroethane having λmax at 437 nm. The proposed method is free from interference of many analytically important elements, with a molar absorptivity and Sandell’s sensitivity of 5.32 × 104 dm3 mol−1 cm−1 and 0.0018 μg Mo cm−2, respectively.
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