Rapid Sensing Of Molybdenum By Combined Colorimetric Solid-Phase Extraction-Reflectance Spectroscopy
| Autor: | Duygu Aksu, Hayati Filik, Ismail Boz, Reşat Apak |
|---|---|
| Rok vydání: | 2009 |
| Předmět: |
Aqueous solution
Chemistry Metal ions in aqueous solution Extraction (chemistry) Metals and Alloys Analytical chemistry chemistry.chemical_element Amberlite Condensed Matter Physics Surfaces Coatings and Films Electronic Optical and Magnetic Materials Matrix (chemical analysis) Molybdenum Reagent Materials Chemistry Solid phase extraction Electrical and Electronic Engineering Instrumentation |
| Popis: | A new and selective colorimetric solid-phase extraction (C-SPE) procedure for the determination of Mo(VI) in aqueous samples is proposed. Phenylhydrazine (PHZ) was used as a coloring reagent for molybdenum and its immobilisation onto a commercially available Amberlite XAD-16 resin was achieved. In this analytical technique analogous to a reflectometric sensor, the analytes in samples were extracted onto a solid sorbent matrix loaded with a colorimetric reagent and then quantified directly on the adsorbent surface by using a miniature reflectance spectrometer. The measurements were carried out at a wavelength of 554.05 nm since it yielded the largest divergence different in reflectance spectra before and after reaction with Mo(VI). The solution pH was controlled at pH 2.2 using phosphoric acid-primary phosphate buffer solution. A large number of metal ions known as common matrix elements for Mo(VI) did not interfere with the determination. The amount of resin-concentrated Mo(VI) was then determined in a few seconds by using a miniature reflectance spectrometer, with a total sample workup and readout time of similar to 5 min using only 1-mL sample volumes. The linear dynamic range of Mo(VI) was found within the concentration range of 0.5-12 ppm with its LOD of 0.2 ppm. The C-SPE from different extractions (n = 5) gave a RSD of 3.3% at 9.6 ppm Mo. (C) 2009 Elsevier B.V. All rights reserved. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|