Author： Shamsipur Mojtaba
Publisher： Taylor & Francis Ltd
ISSN： 0306-7319
Source： International Journal of Environmental and Analytical Chemistry, Vol.82, Iss.1, 2002-01, pp. : 23-30
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Abstract
A simple and reliable method has been developed to selectively separate and concentrate ultra trace amounts of mercury ion from aqueous samples for the subsequent measurement by cold vapor atomic absorption spectrometry (CVAAS). The Hg2+ ions are adsorbed selectively and quantitatively during passage of aqueous samples through octadecyl-bonded silica membrane disks modified by dibenzodiazathia-18-crown-6-dione. The retained mercury ions are then stripped from the disk with a minimal amount of 0.5 M hydrobromic acid solution as eluent, and determined by CVAAS. The proposed method permitted large enrichment factors of about 300 or higher. The limit of detection of the proposed method is 3 ng Hg2+ per 1000 ml. The method was applied to the recovery determination in four water samples.
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