Sensitive capillary electrophoretic determination of mercury species with amperometric detection at a copper electrode after cation exchange preconcentration
Language English Country Germany Media print
Document type Journal Article, Research Support, Non-U.S. Gov't
- MeSH
- Time Factors MeSH
- Electrochemistry MeSH
- Electrodes MeSH
- Electrophoresis, Capillary instrumentation methods MeSH
- Ion Exchange MeSH
- Cations chemistry MeSH
- Copper chemistry MeSH
- Microfluidic Analytical Techniques instrumentation methods MeSH
- Mercury analysis MeSH
- Sensitivity and Specificity MeSH
- Publication type
- Journal Article MeSH
- Research Support, Non-U.S. Gov't MeSH
- Names of Substances
- Cations MeSH
- Copper MeSH
- Mercury MeSH
A capillary electrophoretic method for the separation of four mercury species with amperometric detection was developed. Inorganic Hg2+, methyl-, ethyl-, and phenyl-mercury were complexed with L-cysteine and separated in a counterelectroosmotic mode in an electrolyte solution comprised of 20 mM sodium tetraborate at pH 9.5. Amperometric detection of separated species was achieved at passivated copper electrode under electrocatalytic oxidation conditions. The four mercury species were separated in less than 8 min with LODs ranging from 170 to 450 microg/L. Cation exchange preconcentration was used to decrease the LODs down to 1.7 microg/L.
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