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Indirect atomic absorption spectrometric determination of perchlorate by liquid-liquid extraction in a flow-injection system

✍ Scribed by M. Gallego; M. Valcárcel

Publisher
Elsevier Science
Year
1985
Tongue
English
Weight
571 KB
Volume
169
Category
Article
ISSN
0003-2670

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✦ Synopsis

The determination is based on the continuous liquid-liquid extraction of the copper(I)/ 6-methylpicolinealdehyde azine/perchlorate ion-pair into 4-methyl-2-pentanone in a flowinjection manifold. The organic extract fills a loop of an injector situated in an integrated feed system of an atomic absorption spectrometer. Measurement of the copper atomic absorption signal from the organic phase allows the indirect determination of 0.1-5 Mg ml-' perchlorate, giving a 3-fold increase in sensitivity over the conventional spectrophotometric method. The detection limit is 70 ng ml-l. The sampling frequency is 45 f 5 h". The method is highly selective, and has been used for the determination of perchlorate added to serum and urine samples.

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