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On-line dialysis as a sample preparation technique for ion chromatography
B M De Borba1, J M Brewer, J Camarda
1Metrohm-Peak, Houston, TX 77034, USA. brian@metrohm-peak.com
Journal of Chromatography. A
|July 19, 2001
Summary
This study introduces automated on-line dialysis for ion chromatography, simplifying the analysis of anions and cations in diverse samples like milk and wastewater with high accuracy and precision.
Area of Science:
- Analytical Chemistry
- Separation Science
Background:
- Ion chromatography is a key technique for analyzing ionic species.
- Sample preparation often presents a bottleneck in chromatographic analysis, especially for complex matrices.
Purpose of the Study:
- To develop and validate a fully automated on-line dialysis system for sample preparation in ion chromatography.
- To assess the applicability of the method across a range of challenging sample matrices.
Main Methods:
- Utilized stopped-flow dialysis for continuous sample dialysis over 10 minutes.
- Coupled the automated dialysis system directly to an ion chromatographic system.
- Analyzed various matrices including milk, wastewater, fruit juice, engine coolant, and a multivitamin tablet without prior treatment.
Main Results:
- Achieved analyte recoveries for both anions and cations ranging from 87% to 106%.
- Demonstrated excellent repeatability with values between 0.2% and 4% across multiple sample injections.
- Successfully analyzed diverse matrices without the need for additional sample pretreatment steps.
Conclusions:
- Automated on-line dialysis is an effective and versatile sample preparation technique for ion chromatography.
- The method offers high accuracy, precision, and broad applicability to complex real-world samples.
- This approach significantly streamlines the analytical workflow for ion determination.