Preconcentration of aluminium by micellar-enhanced ultrafiltration

✍ Scribed by Miguel de la Guardia; Empar Peris-Cardells; Angel Morales-Rubio; Alessandra Bianco-Prevot; Edmondo Pramauro

• Publisher: Elsevier Science
• Year: 1993
• Tongue: English
• Weight: 647 KB
• Volume: 276
• Category: Article
• ISSN: 0003-2670
• DOI: 10.1016/0003-2670(93)85053-m

✦ Synopsis

Traces of aluminium were preconcentrated in water samples by forming a complex with lumogallion, and successfully accumulated in the micellar phase obtained from cationic or non-ionic surfactants and filtered through 10000 molecular weight cut-off ultrafiltration membranes. Studies indicated that, at pH 5.9, with 1 x 10m3 M lumogallion and 2 X lo-* M cetyltrimethylamonium bromide, quantitative retention of aluminium present at pg ml-' concentration levels was achieved. A micellar-enhanced fluorimetric procedure was employed to analyse the permeate solutions, whereas nitrous oxide-acetylene flame atomic emission spectrometry was used to determine a1uminium in the retentate. The experimental parameters that influence the micellar-enhanced ultrafiltration (MEUF) efficiency were investigated and the analytical procedures were optimized. The MEUF of trace levels of aluminium allows for either preconcentration of the analyte or enhancement of the emission signals.