Ion-pair liquid-solid extraction for the preconcentration of trace metal ions Optimization of experimental conditions.
Cu(II) has been recovered from dilute solutions (0.1 mug/ml) by adsorbing the ion-pairs formed between different quaternary ammonium salts and the Cu-8-hydroxyquinoline-5-sulphonic acid complex on adsorbent resins, namely XAD 8 and S 862. Both batch and column techniques have been used, the first of which gave superior recovery and precision. It has also been shown that XAD 8 resin can be transformed into an ion-exchanger suitable for preconcentration of Cu(II). The results obtained have been compared with those of reversed-phase ion-pair chromatography and a model is proposed.
Porta
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Dipartimento di Chimica Analitica, Università di Torino, Via Pietro Giuria 5, 10125 Torino, Italy.
Mentasti
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Sarzanini
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Gennaro
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MC