期刊
JOURNAL OF SEPARATION SCIENCE
卷 30, 期 7, 页码 1070-1076出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/jssc.200600476
关键词
amperometric detection; capillary electrophoresis; copper electrode; ion exchange preconcentration; mercury speciation
A capillary electrophoretic method for the separation of four mercury species with amperometric detection was developed. Inorganic Hg2+, methyl-, ethyl-, and phenylmercury 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 mu g/L. Cation exchange preconcentration was used to decrease the LODs down to 1.7 mu g/L.
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