High-sensitive analysis by capillary electrophoresis by using highly efficient electrokinetic supercharging and its application to water analysis

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With the aim of high-sensitive analysis by capillary zone electrophoresis, electrokinetic supercharging preconcentration method was optimized to give ppt level LOD for rare earth ions etc(e. g. for Er(iii), LOD was 0. 04 nM(6. 7 ng/ L)). The LOD achieved is comparable to that of ICP-MS. By using 900 uL sample in an elongated vial where the distance between the capillary end and the electrode was 40 mm, the analytes could be introduced efficiently. The proposed preconcentration strategy afforded an enrichment factor of 80, 000.