Extractive Spectrophotometric Determination of Tungsten(VI) Using 3-Hydroxy-2-(2'-Thienyl)-4-OXO-4H-1- Benzopyran
| Autor: | J. R. Mehta, N. Agnihotri |
|---|---|
| Rok vydání: | 2004 |
| Předmět: |
Trace Amounts
Ligand Analytical chemistry chemistry.chemical_element Molar absorptivity Tungsten Ligands Sensitivity and Specificity Chemistry Techniques Analytical Analytical Chemistry Benzopyran Metal chemistry.chemical_compound chemistry Spectrophotometry visual_art Reagent visual_art.visual_art_medium General Environmental Science Nuclear chemistry Dichloromethane |
| Zdroj: | Annali di Chimica. 94:341-345 |
| ISSN: | 1612-8877 0003-4592 |
| DOI: | 10.1002/adic.200490039 |
| Popis: | A simple, rapid, highly sensitive and selective spectrophotometric method for the determination of tungsten(VI) in trace amounts is developed using 3-hydroxy-2-(2'-thienyl)-4-oxo-4H-1-benzopyran (HTB) as a reagent for the complexation of metal ion and extracting the 1:2 (metal:ligand) complex into dichloromethane from 0.2 M HCl solution. It obeys Beer's law in the range 0-2.8 microg Wml(-1) with molar absorptivity and Sandell's sensitivity at 415 nm as 6.45 x 10(4) L mol(-1) cm(-1) and 0.0029 microg W(VI) cm(-2), respectively. The method is free from the interference of a large number (39) of elements and handles satisfactorily the analysis of various samples of varying complexity. |
| Databáze: | OpenAIRE |
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