Abstract
A sensitive and rapid method for preconcentration of aluminum has been developed by using naphthalene–methyltrioctylammonium chloride (Aliquat-336s) adsorbent. Aluminum ion forms a complex with Eriochrome cyanine R that is retained by the adsorbent in the column at pH 6 with a flow rate of 1 ml min−1. The metal complex and naphthalene adsorbent are completely dissolved out of the column with 5 ml of a N,N-dimethylformamide (DMF) and acetic acid mixture (2:1) and the absorbance is measured at 557 nm. The calibration graph is linear in the range 0.1–10 μg of aluminum in 5 ml of final DMF and acetic acid mixture, and the detection limit is 0.01 μg ml−1. A relative standard deviation of 1.6% is obtained for eight replicate determinations of 5 μg of aluminum. The proposed method was applied to the determination of aluminum in certified reference material.
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