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Abstract
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A simple dispersive solid-phase micro-extraction method based on CoFe2O4 nano-particles (NPs)
functionalized with 8-hydroxyquinoline (8-HQ) with the aid of sodium dodecyl sulfate (SDS) was developed
for separation of Al(III) ions from aqueous solutions. Al(III) ions are separated at pH 7 via complex formation
with 8-HQ using the functionalized CoFe2O4nano-particles sol solution as a dispersed solid-phase extractor.
The separated analyte is directly quantified by a spectrofluorometric method at 370 nm excitation and
506 nm emission wavelengths. A comparison of the
fluorescence of Al(III)–8-HQ complex in bulk solution
and that of Al(III) ion interacted with 8-HQ/SDS/CoFe2O4 NPs revealed a nearly 5-fold improvement in
intensity. The experimental factors influencing the separation and in situ monitoring of the analyte were
optimized. Under these conditions, the calibration graph was linear in the range of 0.1–300 ng mL1 with a
correlation coefficient of 0.9986. The limit of detection and limit of quantification were 0.03 ng mL1 and
0.10 ng mL1, respectively. The inter-day and intra-day relative standard deviations for six replicate
determinations of 150 ng mL1 Al(III) ion were 2.8% and 1.7%, respectively. The method was successfully
applied to direct determine Al(III) ion in various human serum and water samples.
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