The chelating-resin modified electrode and its application in the detection of copper in human samples

A new kind of carbon paste electrodes modified by chelating resin was prepared for detection of trace amount of copper in human hair. As the ion exchange between chelating resin and cupric ions and the coordination reaction on the modified electrode take place at the same time, this method has high sensitivity and good selectivity. The detection limit is 6 x 10(-9) mol/L. The average percentage of recovered copper is 108 +/- 8.3% and the variant coefficient (CV) 7.7%.