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The determination of distribution coefficient for some elements on the macroporous cation exchanger Amberlyst 15 using nitric acid – methanol mixtures
Author(s)
Mabakane, Elizabeth Nontombi
Date Issued
2016
Type
Thesis
Publisher
Cape Peninsula University of Technology
Abstract
The main purpose of this study is to understand the application of ion exchange
chromatography on separation of charged ions of elements. Ion exchange chromatography is an analytical method, which is used for the separation of elements,
quantitation and qualitation. The use of Amberlyst 15 resin as a source of separation for
metal ions has been investigated and studies in various academic disciplines such as
chemistry and material science. In this research study, Amberlyst 15 resin was
investigated in order to understand the separation of positively charged divalent
elements ions (Zn2+, Cu2+, Co2+ and Ni2+). The use of nitric acid and methanol mixture
enhanced separation of these metal ions by ensuring that nitric acid is constant and
varying methanol concentration. In this study, it was found that the resin has a high
affinity for the metal ions at high methanol concentration, hence the distribution
coefficient values increase but decreases at low methanol concentrations. The complexities of molecular structure of the salts of the elements provide the more
understanding of the metal ion interaction with the resin particle. Furthermore, the role
and strength of nitric acid to break the structural bonds and release the metal ions to get
sorbed on the resin remains the most essential factor of understanding distribution
coefficient values. Method validation parameters such as linearity, precision and
accuracy of the method were determined. The method precision and accuracy were
determined from the QC samples which is expressed as relative error (%RE) with the
total coefficient of variation (%CV’s) were < 20%.
chromatography on separation of charged ions of elements. Ion exchange chromatography is an analytical method, which is used for the separation of elements,
quantitation and qualitation. The use of Amberlyst 15 resin as a source of separation for
metal ions has been investigated and studies in various academic disciplines such as
chemistry and material science. In this research study, Amberlyst 15 resin was
investigated in order to understand the separation of positively charged divalent
elements ions (Zn2+, Cu2+, Co2+ and Ni2+). The use of nitric acid and methanol mixture
enhanced separation of these metal ions by ensuring that nitric acid is constant and
varying methanol concentration. In this study, it was found that the resin has a high
affinity for the metal ions at high methanol concentration, hence the distribution
coefficient values increase but decreases at low methanol concentrations. The complexities of molecular structure of the salts of the elements provide the more
understanding of the metal ion interaction with the resin particle. Furthermore, the role
and strength of nitric acid to break the structural bonds and release the metal ions to get
sorbed on the resin remains the most essential factor of understanding distribution
coefficient values. Method validation parameters such as linearity, precision and
accuracy of the method were determined. The method precision and accuracy were
determined from the QC samples which is expressed as relative error (%RE) with the
total coefficient of variation (%CV’s) were < 20%.
Additional information
Thesis (MTech (Chemistry))--Cape Peninsula University of Technology, 2016
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204565219-Mabakane-EN-Mtech-Chemistry-Appsc-2016.pdf
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Thesis
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