Dissertation > Excellent graduate degree dissertation topics show

Modification of Magnetic Nano-materials and the Application in Chromium Speciation

Author: ZhangJing
Tutor: WuYiWei
School: Hubei Normal University,
Course: Analytical Chemistry
Keywords: Magnetic nanomaterials Chromium speciation analysis Amino silane APDC Zirconium oxychloride Environmental and biological samples Silanization method Sol-gel method Modified method
CLC: X830
Type: Master's thesis
Year: 2011
Downloads: 107
Quote: 0
Read: Download Dissertation

Abstract


Solid phase extraction (SPE) has become one of the most important techniques used for separation and preconcentration due to its advantages of low organic solvents consumption, rapid phase separation, strong stability, good selectivity, high enrichment factor, high adsorption capacity, closed operation without introducting pollutants, simple preparation method, easy automation, good ability of combination with different determination techniques etc.. The aim of this dissertation is to develop new solid phase extraction materials and new magnetic solid phase extraction technology, to establish new technology of combination flame atomic absorption spectrophotometer (FAAS) with magnetic solid phase extraction (MSPE) and new method of chromium species analysis. The main contents are as follows:(1) A method has been developed for the determination of trace chromium species (Cr(III) and Cr(VI)) in environmental and biological samples by MSPE combined with FAAS using Fe3O4@SiO2-AEAPS as extractant. Various parameters affecting MSPE were optimized systematically. Under the optimized conditions, an enrichment factor 100 and the determination limit 0.66μg/L were found. The proposed method has been successfully applied to the determination of trace chromium species in environmental and biological samples.(2) A method has been developed for the determination of trace chromium species (Cr(Ⅲ) and Cr(Ⅳ)) in environmental and biological samples by MSPE combined with FAAS using Fe3O4@ZrO2 as extractant. Various parameters affecting MSPE were optimized systematically. Under the optimized conditions, an enrichment factor 25 and the determination limit 0.69μg/L were found. The proposed method has been applied to the determination of trace chromium species in environmental and biological samples, and a well result was received.(3) A method has been developed for the determination of trace chromium species (Cr(Ⅲ) and Cr(Ⅵ)) in environmental and biological samples by MSPE combined with FAAS using Fe3O4@APDC as extractant. Various parameters affecting MSPE were optimized systematically. Under the optimized conditions, an enrichment factor 8.3 and the determination limit 3.13μg/L were found. The proposed method has been successfully applied to the determination of trace chromium species in environmental and biological samples, demonstrating the feasibility and reliability of the proposed method.

Related Dissertations

  1. Study on the Synthesis Bi3.25La0.75Ti3O12（BLT） Nanotubes and Nano Wires,TB383.1
  2. Cobalt Ferrite and Its Performance,O611.4
  3. The Research on Preparation Technology and Sintering Behavior of Rare Earth Aluminates (Dy3Al5O12、 NdAlO3、LaAl11O18),TB383.3
  4. Studies of High Refractive Index Materials Prepared by Nano ZrO2 and TiO2 Hybrid Silicone Epoxy Resin,TB383.1
  5. Preparation and Characterization of Al2O3/C Hybrid Aerogels and Al2O3 Aerogels,O648.17
  6. The Study on Properties of Desulfurization and Denitrification by Mn/Al Catalysts,X773
  7. Investigation into ZnO Thin Film Transistors Prepared by Sol-gel Method,TN321.5
  8. Sol - gel method p -type ZnO films,O484.1
  9. Storage-stable organic / inorganic hybrid polymers and their light-cured coating application,TQ630.4
  10. Precursor Preparation of ZrO 2 -modified C / SiC composite materials and their properties,TB332
  11. Doped ZnO thin film magnetic materials Preparation and magnetic properties at room temperature,O484.1
  12. Nano- TiO_2 composite photocatalytic oxidation of elemental mercury removal experimental study,X51
  13. Study on Preparation of Laden TiO2 and Application of Photocatalytic Degradation to Advanced Treatment of Dyeing Waste Water,X791
  14. Finishing of Cotton Fabric with Vitamin E by Sol-gel Method,TS195.5
  15. Technology and Properties of vanadium oxide thin films,TB383.2
  16. Synthesis and Characterization of Sb-doped SnO2-（CeO2-TiO2） Composite Thin Films Deposited on Substrates for Antistatic Electricity and UV-Shielding,TB383.2
  17. Study on the Structure and Magnetic Properties of K-doped SnO2 and V-doped ZnO Diluted Magnetic Semiconductor Powders,TB383.1
  18. Sol-Gel Synthesis of Nano-sized Phosphors and Their Properties,TB383.1
  19. The synthesis of NZP family mesoporous phosphate materials,O643.36
  20. Catalytic Behaviors for Isobutene Selective Oxidation of MoVBi-AlPO4 Catalysts,O643.32
  21. Study on the NOx Storage and Sulfur Resistance of the Rare-Earth Containing La0.7Sr0.3Co1-xFexO3 Perovskite-type NOx Traps,O643.36

CLC: > Environmental science, safety science > Environmental Quality Assessment and Environmental Monitoring > Environmental monitoring > General issues
© 2012 www.DissertationTopic.Net  Mobile