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dc.contributor.authorChen, Wencan.en_US
dc.date.accessioned2009-07-09T18:43:11Z
dc.date.available2009-07-09T18:43:11Z
dc.date.issued1999-07-09T18:43:11Z
dc.identifier.urihttp://hdl.handle.net/10464/2086
dc.description.abstractNanoporous materials with large surface area and well-ordered pore structure have been synthesized. Thiol groups were grafted on the materials' surface to make heavy metal ion pre-concentration media. The adsorption properties ofthe materials were explored. Mercury, gold and silver can be strongly adsorbed by these materials, even in the presence of alkaline earth metal ion. Though the materials can adsorb other heavy metal ions such as lead and copper, they show differential adsorption ability when several ions are present in solution. The adsorption sequence is: mercury> == silver> copper » lead and cadmium. In the second part of this work, the memory effects of mercury, gold, silver and boron were investigated. The addition of 2% L-cysteine and 1% thiourea eliminates the problems of the three metal ions completely. The wash-out time for mercury dropped from more than 20 minutes to 18 seconds, and the wash-out time for gold decreased from more than 30 minutes to 49 seconds. The memory effect of boron can be reduced by the use of mannitol.en_US
dc.language.isoengen_US
dc.publisherBrock Universityen_US
dc.subjectPorous materials.en_US
dc.subjectNanostructured materials.en_US
dc.subjectHeavy metals.en_US
dc.subjectAdsorption.en_US
dc.subjectInductively coupled plasma atomic emission spectrometry.en_US
dc.titleSynthesis of nanoporous materials for preconcentration and determination of trace elements by ICP-AES ; Investigation and elimination of the memory effects of mercury, gold, silver and boron in ICP-AESen_US
dc.typeElectronic Thesis or Dissertationen_US
dc.degree.nameM.Sc. Chemistryen_US
dc.degree.levelMastersen_US
dc.contributor.departmentDepartment of Chemistryen_US
dc.degree.disciplineFaculty of Mathematics and Scienceen_US


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