Analytical Instrumentation
Automated Dialysis as a Sample Preparation Tool in Ion Chromatography
Jul 31 2009
Ion chromatography (IC) as an analytical technique has seen an impressive surge in popularity. 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.
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 cannot be automated and are error-prone.
Metrohm’s compact stopped-flow dialysis is an elegant alternative. This fully automated sample preparation setup is based on the selective diffusion of ions from one liquid (sample/donor solution) to another (acceptor solution) through a membrane. Contrary to dynamic dialysis, where two solutions continuously pass through the dialysis module, the acceptor solution is stopped until its concentration is the same as that in the donor solution. This patented stoppedflow 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.
Digital Edition
PIN 25.2 Apr/May
May 2024
Safety - Carbon monoxide toxic and flammable gas detection Analytical Instrumentation - Density: A fundamental parameter at critical stages within the petroleum sector - Advancements and...
View all digital editions
Events
Jul 10 2024 Birmingham, UK
Thailand Oil & Gas Roadshow 2024
Jul 11 2024 Rayong, Thailand
Jul 20 2024 Denver, CO, USA
Jul 21 2024 Cape Town, South Africa
Jul 24 2024 Bogata, Colombia