Abstract
A flow-injection method has been developed for the separation and determination of thallium and gold. It is based on the chromatographic separation of chloro complexes of thallium(III) and gold(III) on a Sephadex G-25 column, followed by an extraction-photometric determination with Rhodamine B. The peaks of thallium and gold are completely separated with 0.5M hydrochloric acid and 1M lithium chloride as the eluent; the retention times are 5.5 and 11.0min, respectively. The two metals can be separated and determined within the range 0-5mg l-1 for each metal. All foreign substances examined are eluted before thallium. Thallium and gold were determined in coal fly ash and ore samples by the proposed method.
