Abstract
A high preconcentration method using on-line liquid–liquid extraction for determination by atomic spectrometry was developed. An aqueous sample solution was continuously introduced into a flow system in which beryllium(II) was successively extracted and concentrated into p-xylene as its penta-2,4-dionato complex. By applying a very large flow rate ratio between the sample solution and p-xylene, an enrichment factor of 75 was obtained. Furthermore, by using ICP-AES as a detector, an additional enhancement effect caused by the organic solvent was expected. Therefore, an observed net enhancement factor of 1300 was achieved as a result of both effects. The detection limit of the proposed method was estimated to be 8.0 pg mL−1 of beryllium(II), while that of the conventional nebulisation of an aqueous solution without liquid–liquid extraction was 3.1 ng mL−1.
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