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Abstract
A simple, fast, selective and sensitive method is developed for the microdetermination of tungsten(VI) with 3-hydroxy-2-[1¢-phenyl-3¢- (p-methylphenyl)-4¢-pyrazolyl]-4-oxo-4H-1-benzopyran (HPMPPB). The reagent forms a 1:4 (M:L) yellow complex in HCl medium which is extractable into chloroform and exhibits maximum absorbance at 415-430 nm. The Beer¢s law holds good in tungsten(VI) concentration range of 0.0-2.0 mg mL-1 with molar extinction coefficient and Sandell¢s sensitivity of 9.936 × 104 dm3 mol-1 cm-1 and 0.0019 mg W cm-2, respectively at 420 nm . The proposed method is free from the interference of a large number of analytically important elements and shown to give satisfactory results in the analysis of various synthetic and industrial samples of varying composition.