Monolithic octadecylsilyl-silica gel column for the high-speed ion chromatographic determination of acidity |
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Authors: | Xu Qun Tanaka Kazuhiko Mori Masanobu Helaleh Murad I H Hu Wenzhi Hasebe Kiyoshi Toada Hiroshi |
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Affiliation: | National Institute of Advanced Industrial Science and Technology, 110, Nishiibara-cho, Seto, Aichi 489-0884, Japan. qun-xu@aist.go.jp |
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Abstract: | A monolithic ODS-silica gel column modified by saturating it with lithium dodecylsulfate (Li-DS) was used to demonstrate the high-speed separation of H+ from other mono- and divalent cations, such as Na+, NH4+, K+, Mg2+ and Ca2+ using ion chromatography (IC). Using a 5 mM EDTA-2K solution containing 0.10 mM Li-DS (pH 4.80) as eluent, H+ was eluted with a sharp and symmetrical peak within 1.0 min before other cations at a flow-rate of 1.5 ml min(-1). The rapid elution of H+ and its conductimetric detection could be attributed to the presence of EDTA (HY2-), which can convert H+ ions as anions. i.e. H(+) + H2Y(2-) --> H3Y(-). The acidity of rainwater and deionized water samples was determined using this IC system with satisfactory results. |
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