Add time:08/10/2019         Source:sciencedirect.com

Clean-up and matrix elimination of samples are useful for removal of column-fouling substances and interfering ions in many ion chromatography applications. Matrix elimination is especially important in trace analysis, where preconcentration of large sample volumes is often required. Even mid-ppm concentrations of interfering ions can have a detrimental effect on preconcentration efficiency and chromatographic separation. Whereas halides are easily removed from samples by precipitation on silver-form cation exchange resin, sulfate removal on barium-form resin has been problematic. At best, the efficiency of sulfate removal is dependent on the cation content of the sample matrix. In addition, sulfate leakage from the resin bed limits the sample volume that can be applied to a barium-form device.In this paper we explore the chemical processes that are involved in the precipitation of sulfate with barium, their effects on analyte recovery and the completeness of sulfate removal, and the implications for use of barium-form ion exchange devices for removing sulfate from samples.

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