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Highly sensitive chemiluminescence detection of copper(II) in capillary electrophoresis with field‐amplified sample injection
Author(s) -
Liu YanMing,
Cheng JieKe
Publication year - 2002
Publication title -
electrophoresis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.666
H-Index - 158
eISSN - 1522-2683
pISSN - 0173-0835
DOI - 10.1002/1522-2683(200202)23:4<556::aid-elps556>3.0.co;2-s
Subject(s) - detection limit , chemiluminescence , capillary electrophoresis , analytical chemistry (journal) , copper , electrophoresis , chromatography , chemistry , capillary action , spark plug , materials science , organic chemistry , engineering , composite material , aerospace engineering
Field‐amplified sample injection of copper(II) was investigated using capillary electrophoresis with chemiluminescence detection. The sensitivity of copper(II) has been improved markedly by the field‐amplified sample injection technique and the detection limit reaches 2×10 –11 M . By injection of a short plug of water before sample introduction, the sensitivity can be further improved 5‐fold and the detection limit reaches 4×10 –12 M . The relative standard deviations ( n = 6) of the migration time and the peak height are 0.61% and 4.7% at 1.0×10 –9 M Cu(II), respectively. Parameters affecting the field‐amplified sample injection, such as separation voltage and concentration of electrophoretic buffer, have been investigated.