Ion chromatography (IC) as an analytical technique has seen an impressive surge in popularity. It is both simple and robust as a method and there is great choice of columns, detectors and applications. As for samples in a homogenous ionic form, hardly any preparation steps are required at all. Now, Metrohm’s patented stopped-flow dialysis paves the way for the convenient analysis of demanding samples carrying high organic loads too.
Shortcomings of traditional sample preparation
In complex matrices carrying high organic loads such as waste water, soil eluates or dairy products, extensive sample preparation is mandatory to prevent destruction of the column. Traditional preparation techniques such as the Carrez precipitation do not provide a satisfying answer as they are both tedious and error-prone.
Inline sample preparation in 10 minutes
Metrohm’s compact stopped–flow dialysis does. It is based on the selective diffusion of ions from one liquid (sample or donor solution) to another (acceptor solution) through a membrane. Contrary to dynamic dialysis, where two solutions continuously pass through the dialysis module, the donor solution is temporarily stopped as soon as the concentration in the acceptor solution is the same as that in the donor solution. This patented stopped-flow procedure takes between 10 and 14 minutes and can be directly coupled to an IC setup. As the dialysis is performed during the recording of the previous sample’s chromatogram, the overall analysis time is not significantly prolonged.(from IFSQN.com)(soon in Greek)
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