A simple and rapid new dispersive liquid-liquid microextraction based on solidification of floating organic drop combined with inductively coupled plasma-optical emission spectrometry for preconcentration and determination of aluminium in water samples.

A new dispersive liquid-liquid microextraction method based on solidification of floating organic drop (DLLME-SFO) combined with inductively coupled plasma-optical emission spectrometry (ICP-OES) was developed for the determination of aluminium. An appropriate mixture of acetone and 1-undecanol was injected rapidly into the aqueous sample containing aluminium-morin complex and as a result cloudy mixture was formed. After centrifugation, the test tube was cooled for 5 min. The solidified 1-undecanol on top of the solution was transferred into a suitable vial. Then, 100 microL of it was dissolved in 100 microL of 1-propanol and finally injected into the ICP-OES. Under the optimum conditions, the enhancement factor of 128 was obtained for only 20.0 mL of the water sample. The calibration graph was linear in the range of 1.0-250.0 microg L(-1) with the limit of detection of 0.8 microg L(-1). The relative standard deviation (RSD) for five replicate measurements of aluminium was 4.5%. Copyright 2010 Elsevier B.V. All rights reserved.