Abstract
The use of ion-exchangers located in the flow cell of an unsegmented flow system is proposed and applied to the determination f copper(II) based on the formation of a colored chelate with 1-(2-pyridylazo)-2-naphthol retained on Dowex 50W resin. The sample solution can be injected in the normal way or pumped into the system over an interval of time dependent on the analyte concentration (preconcentration method for very dilute samples). Kinetic measurements are made along the retention curve. Copper(II) is eluted with thioglycollic acid, which makes the system reversible. The determination limit achieved is 1 ng ml -1 and the calibration curves have good features. Depending on the conditions chosen, the sampling frequency is 10–110 h −1.
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