2-(2-Furyl)-3-hydroxy-4H-chromen-4-one as an Analytical Reagent for Molybdenum(VI)

Autor:	Rameshwar Dass, J. R. Mehta
Rok vydání:	1993
Předmět:	chemistry.chemical_compound Acetic acid Chloroform chemistry Molybdenum Reagent Inorganic chemistry chemistry.chemical_element General Chemistry Molar absorptivity Absorption (chemistry) Oxalate Equilibrium constant
Zdroj:	Bulletin of the Chemical Society of Japan. 66:2251-2254
ISSN:	1348-0634 0009-2673
DOI:	10.1246/bcsj.66.2251
Popis:	2-(2-Furyl)-3-hydroxy-4H-chromen-4-one (FHC) has been used as an analytical 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 yellow 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 absorptivity of 4.99 × 104 dm3 mol−1 cm−1 and Sandell’s sensitivity equal to 0.0019 μg 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 × 10−12. For 1 μg Mo cm−3 the standard deviation was 0.004 with a relative mean error of ±0.7%. The method is simple, selective, precise and rapid and has been applied to the determination of molybdenum in synthetic and standard samples.
Databáze:	OpenAIRE
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