Column Preconcentration of Aluminum and Copper(II) in Alloys, Biological Samples, and Environmental Samples with Alizarin Red S and Cetyltrimethylammonium-Perchlorate Adsorbent Supported on Naphthalene Using Spectrometry
✍ Scribed by T. Nagahiro; G.F. Wang; M. Satake
- Publisher
- Elsevier Science
- Year
- 1995
- Tongue
- English
- Weight
- 464 KB
- Volume
- 52
- Category
- Article
- ISSN
- 0026-265X
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✦ Synopsis
A column method has been established for the preconcentration of aluminum and copper(II) with Alizarin Red (S) and a cetyltrimethylammonium-perchlorate ion pair supported on naphthalene. using a simple glass-tipped tube. Aluminum and copper(II) react with Alizarin Red S to form water-soluble colored chelate anions. These chelate anions form water-insoluble ternary complexes with the adsorbent on the inactive surface of naphthalene packed into a column. They are quantitatively retained in the (\mathrm{pH}) ranges of 4.7-5.2 for aluminum and (5.0-10.0) for copper. The solid mass is dissolved out from the column with (5 \mathrm{ml}) of dimethylformamide (DMF) for aluminum and (5 \mathrm{ml}) of ethanol for copper and the absorbance was measured with a spectrometer at (525 \mathrm{~nm}) for aluminum and at (529 \mathrm{~nm}) for copper. The calibration curves were linear over the concentration ranges of (0.25-5.0 \mu \mathrm{g}) of aluminum in (5 \mathrm{ml}) of DMF solution and (0.50-12.0 \mu \mathrm{g}) of copper in (5 \mathrm{ml}) of ethanol solution. The molar absorptivities and Sandell's sensitivities were respectively calculated to be (2.8 \times 10^{4}) liter (\cdot \mathrm{mol}^{-1} \cdot \mathrm{cm}^{-1}) and (9.62 \times 10^{-4} \mu \mathrm{g} \cdot \mathrm{cm}^{-2}) for aluminum and (2.5 \times 10^{4} \mathrm{liter} \cdot \mathrm{mol}^{-1} \cdot \mathrm{cm}^{-1}) and 2.5 (\times 10^{3} \mu \mathrm{g} \cdot \mathrm{cm}^{-2}) for copper. Seven replicate determinations of sample solutions containing (2.5 \mu \mathrm{g}) of aluminum and (6.0 \mu \mathrm{g}) of copper gave mean absorbances of 0.520 and 0.480 with relative standard deviations of 1.67 and (0.33 %), respectively. Interference due to various foreign ions has been studied and the method has been applied to the determination of aluminum in standard alloys, tea leaves, vehicle particulates, copper in coal fly ash, and commercial salt samples. O 1995 Acadenic Press, Inc