A system for introducing a sample substance into a spectroscopical analytical instrument which includes a first pump which, when on, pumps a sample liquid and a buffer liquid, and a second pump which, when on, pumps an eluting liquid and rinsing liquid. The system includes an ion exchanger column for retaining the elements of the sample to be determined and which can be eluted by the eluting liquid. A dosing capillary serves to introduce the sample into the furnace of an atomic absorption spectrometer. A valve has a first position wherein the first end of the ion exchanger column communicates with the first pump and the second end communicates with a waste outlet port, and the dosing capillary communicates with a source of displacing fluid; and a second position wherein the second end of the ion exchanger column communicates with the second pump and the first end communicates with the dosing capillary.
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