6-Chloro-3-hydroxy-2-(5′-methylfuryl)-4H-chromene-4-one as an Analytical Reagent for Micro Determination of Molybdenum(VI)

Abstract

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.

A Sensitive, Selective New Analytical Reagent, 2, 6-Diacetylpyridine bis-4-phenyl-3-thiosemicarbazone for Extractive Spectrophotometric Determination of Mo(VI) in Food Samples

“…Hence, the authors are prompted to introduce a new reagent 2,6-Diacetylpyridine-bis-4-phenyl-3-thiosemicarbazone (2, 6-DAPBPTSC) for the sensitive, selective, and extractive spectrophotometric determination of Mo(VI) in food and water samples. The proposed method, when compared with other spectrophotometric methods (Table 1) (Junwei and Yifeng 2001;Sasaki et al 1998;Lopez Fernandez et al 1978;Ahmed and Haque 2002;Alkan et al 2003;Bishnoi et al 2004;Dass and Kumar 2004;Babel et al 2004), is found to more reliable and sensitive. It also has advantages like profundity and propagative properties in addition to its simplicity, instant color development and less interference.…”

Micro Level Determination of Titanium Using 6-Chloro-3-hydroxy-2-(2-furyl)-4-oxo-4H-1-benzopyran as Analytical Reagent

“…A variety of benzopyran reagents employed for spectrophotometric determination of titanium [1][2][3] have undoubtedly been used for the micro determination of some of the metal ions, but these methods require prior separations from seriously interfering elements and are of restricted use due to low sensitivity. In view of aforesaid aspect, an attempt has been made to introduce 6-chloro-3-hydroxy-2-(2′-furyl)-4-oxo-4H-1-benzopyran (CHFB) for the complexation of titanium in acetic acid medium in presence of sulphite effecting quantitative extraction into dichloromethane which not only give a rapid and highly reproducible system but also provides a highly sensitive and selective spectrophotometric determination of titanium in trace amounts.…”