Abstract
A hollow-fiber, membrane-based sample preparation device was investigated for the pretreatment of acidic samples prior to (separate) mono- and divalent cation analysis by ion chromatography. A device consisting of aminated DuPont Nafion fiber immersed in a counter-ion donating solution of either tetrabutylammonium hydroxide (for monovalent cations) or tetrabutylammonium borate (for divalent cations) can effectively neutralize samples with a pH as low as 1. No contaminants are added to the sample using this approach and quantitative recoveries are obtained for standard solutions of alkali metal and alkaline earth cations after passage through the device.
Published Version
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