method and device for chromatographic determination of components of liquid samples.

摘要

For the determination of low ion concentrations in aqueous specimens by ion chromatography with aqueous eluents, the test specimen is added to a stream of extra-pure water, which is mixed immediately ahead of the separation column with an appropriately concentrated eluent. Alternatively, the ions are previously fixed to an adsorber, and eluted from the more highly concentrated eluent, which is again mixed ahead of the separation column with extra-pure water to achieve the concentration necessary for ion chromatography. For such a pre-enrichment, there are two small pre-enrichment columns, which are flowed through by extra-pure water containing the specimen or concentrated eluents alternately in reverse directions from analysis cycle to analysis cycle. An additional purification of the extra-pure water and eluent feed is recommended, as is a pulsation damping by a membrane of a two-headed pump located between the eluent branch and the extra-pure water branch, each with a volume of approximately 1.5 to 2 times the pump stroke.