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Synthesis 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-AES

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dc.contributor.author Chen, Wencan. en_US
dc.date.accessioned 2009-07-09T18:43:11Z
dc.date.available 2009-07-09T18:43:11Z
dc.date.issued 1999-07-09T18:43:11Z
dc.identifier.uri http://hdl.handle.net/10464/2086
dc.description.abstract Nanoporous 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.iso eng en_US
dc.publisher Brock University en_US
dc.subject Porous materials. en_US
dc.subject Nanostructured materials. en_US
dc.subject Heavy metals. en_US
dc.subject Adsorption. en_US
dc.subject Inductively coupled plasma atomic emission spectrometry. en_US
dc.title Synthesis 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-AES en_US
dc.type Electronic Thesis or Dissertation en_US
dc.degree.name M.Sc. Chemistry en_US
dc.degree.level Masters en_US
dc.contributor.department Department of Chemistry en_US
dc.degree.discipline Faculty of Mathematics and Science en_US


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