Ion exchange preconcentration and separation of mercury species by CE with indirect contactless conductometric detection |
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Authors: | Houserová Pavlína Kubán Petr Kubán Vlastimil |
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Affiliation: | Department of Chemistry and Biochemistry, Mendel University of Agriculture and Forestry, Brno, Czech Republic. |
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Abstract: | Capillary electrophoretic separation of four mercury species (inorganic Hg(2+), methyl-, ethyl-, and phenylmercury) was achieved in less than 8 min with an electrolyte consisting of 150 mM 2-amino-2-methyl-propanol (AMP) at pH 11.6. The analytes were complexed with 0.1% mercaptopropionic acid (MPA), separated in counter-EOF as anionic complexes, and detected by a contactless conductometric detector. Ion exchange preconcentration with on-column formation of MPA-mercury complexes was developed. Preconcentration factors of 25-150 were achieved and LODs in the range of 2.9-6.9 ng/mL were feasible. This method may prove to be applicable as a rapid screening method for mercury speciation in environmental samples. |
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Keywords: | CE Indirect contactless conductometric detection Ion exchange preconcentration Mercury Speciation |
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