| 17174469 |
Fan J, Wu C, Wei Y, Peng C, Peng P: Preparation of xylenol orange functionalized silica gel as a selective solid phase extractor and its application for preconcentration--separation of mercury from waters. J Hazard Mater. 2007 Jun 25;145(1-2):323-30. Epub 2006 Nov 18.
A new selective solid phase extractor was prepared from silica gel modified with xylenol orange (SGMXO). The solid phase extractor is stable in 6molL (-1) HCl, common organic solvents, and pH 1.0-9.0 buffer solutions. In the batch experiments, Hg (II) can be adsorbed on SGMXO at pH 1.0 with 90.0% retention, whereas the retention of other common coexisting metal ions such as Cd (II), Pb (II), Cu (II), Ni (II), Co (II), Mn (II), Zn (II), and Fe (III) is less than 4.1%.. The adsorption equilibration for Hg (II) was achieved within 3min. At optimum conditions, the adsorption capacity of the extractor is 18.26micromolg (-1) of dry modified silica gel, and the preconcentration factor is as high as 333. The recovery is still higher than 95% for the preconcentration of 10ngmL (-1) Hg (II). The new solid phase extractor has been used for the preconcentration of low level of Hg (II) in surface water, tap water in chemistry laboratory and student's dormitory and a simulated sea water samples, recoveries of 98.2-100.6% were obtained. It is showed that low level of Hg (II) can be effectively preconcentrated by this new selective solid phase extractor. |
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