Extraction, Spectrophotometric Determination of Tungsten(VI) with 3-Hydroxy-2-[1′-phenyl-3′-(p-methylphenyl)-4'-pyrazolyl]-4-oxo-4H-1-benzopyran as Chelating Agent and its in situ Computational Studies

N. Agnihotri*, S. Akhtar, P. Rathi and N. Kaur

Department of Chemistry, Maharishi Markandeshwar Deemed to be University, Mullana, Ambala-133207, India

*Corresponding author: E-mail: nivagni11@gmail.com; niveditachem@mmumullana.org


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 μg mL-1 with molar extinction coefficient and Sandell′s sensitivity of 9.936 × 104 dm3 mol-1 cm-1 and 0.0019 μg 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.


Tungsten, Extraction, Spectrophotometry, Benzopyran

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