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Title: 6-Chloro-3-hydrox y-2- [2 '-(5 '-methylfuryl)]-4H-chromen-4-one as an analytical reagent for the spectrophotometric determination of tungsten(VI)
Authors: Agnihotri, R
Agnihotri, N
Mehta, J R
Issue Date: Jul-2006
Publisher: NISCAIR-CSIR, India
IPC Code: Int. Cl.8 G01N21/00; G01N33/20
Abstract: A 1:2 light yellow complex of tungsten (VI) is formed with 6-chloro-3-hydroxy-2 –[2'-(5'-methylfuryl)]-4H -chromen-4-one (CHMFC) in 0.18-0.32 M HClO4 medium. The complex is extractable into chloroform and absorbs maximally at 4:15 nm. The absorbance remains constant for more than 1 h with molar absorptivity, detection limit and Sandell’s sensitivity as 2.16×104 L mol-1 cm-1, 0.131μg mL-1 and 0.0085 μg W cm-2, respectively. Beer's law is obeyed in the concentration range of 0-2.6 μg W mL-1 the correlation coefficient is, r=1.001, Oxalate interferes in the tungsten determination. The method has been satisfactorily applied to the analysis of tungsten in various synthetic and technical samples.
Page(s): 1655-1658
ISSN: 0975-0975(Online); 0376-4710(Print)
Appears in Collections: IJC-A Vol.45A(07) [July 2006]

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