Ion exchange preconcentration and separation of mercury species by CE with indirect contactless conductometric detection.
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.
Houserová
Pavlína
P
Department of Chemistry and Biochemistry, Mendel University of Agriculture and Forestry, Brno, Czech Republic.
Kubán
Petr
P
Kubán
Vlastimil
V
D000479:Alkylmercury Compounds / Q000302:isolation & purification*; D004563:Electrochemistry; D004573:Electrolytes / Q000737:chemistry; D019075:Electrophoresis, Capillary / Q000295:instrumentation / Q000379:methods*; D007474:Ion Exchange; D008628:Mercury / Q000302:isolation & purification*; D012680:Sensitivity and Specificity
D000479:Alkylmercury Compounds; D004573:Electrolytes; D008628:Mercury