Abstract
An ion chromatographic (IC) method has been developed for determination of hydrogen ion (H+). It is based on the use of sulfonated cation-exchange resin as stationary phase, aqueous ethylenediamine-N,N,N′,N′-tetraacetic acid (dipotassium salt, EDTA-2K, written as K2H2Y) solution as mobile phase, and conductivity for detection. H+ was separated mainly by cation-exchange, but its elution was accelerated by the presence of EDTA. The order of elution for the model cations was H+ > Li+ > Na+ > NH4 + > Ca2+ > > Mg2+. A sharp and highly symmetrical peak was obtained for H+ and this was attributed to the capacity of H2Y2 2– to receive and bind H+. H+ was detected conductiometrically and detector response (reduction in conductivity as a result of H++H2Y2–→H3Y–) was linearly proportional to the concentration of H+ in the sample. The detection limit for H+ with this IC system was better than 4.7 μmol L–1. A significant advantage of this method was the ability to separate and determine, in one step, H+ and other cations. The successful determination of H+ and other cation species in real acid-rain samples demonstrated the usefulness of this method.
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Received: 8 November 2000 / Revised: 30 January 2001 / Accepted: 3 February 2001
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Hu, W., Iles, A., Hasebe, K. et al. Determination of hydrogen ion by ion chromatography (IC) with sulfonated cation-exchange resin as the stationary phase and aqueous EDTA (ethylenediamine-N,N,N′,N′-tetraacetic acid) solution as the mobile phase. Fresenius J Anal Chem 370, 48–51 (2001). https://doi.org/10.1007/s002160100774
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DOI: https://doi.org/10.1007/s002160100774