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- W2066112529 abstract "Two columns (50 mm × 4.6 mm I.D.) packed with sulphonated styrene-divinylbenzene (PS-DVB) gel (particle size 10 μm) and sulphonated silica gel (particle size 5 μm) were used for the separation of alkaline earth metal and several transition metal ions. The mobile phase contained 3-morpholinopropanesulphonic acid (MOPS)-NaOH buffer and a colour-forming chelating agent, and on-column derivatization and spectrophotometric detection were employed. Arsenazo III, Chlorophosphonazo III, Carboxyarsenazo, Sulphonazo III and Dimethylsulphonazo were examined as mobile phase components for good separation and highly sensitive detection. The PS—DVB gel column and Chlorophosphonazo III gave the highest sensitivity. Ca2+, Sr2+ and Ba2+ were separated in 5 min with a mobile phase containing 2 · 10−4M Chlorophosphonazo III and 2.5 · 10−2M MOPS—NaOH buffer (pH 7.0), whereas Mg2+ was eluted after 30 min. An irregular retention sequence was observed, i.e., Ca2+ < Sr2+ < Ba2+ ⪡ Mg2+; the capacity factors (k′) were 1.3, 3.3, 5.3 and 42.8, respectively. The separation of alkaline earth and several transition metal ions was also examined. Application to the determination of Ca2+ and Mg2+ in tap water is described." @default.
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- W2066112529 date "1993-12-01" @default.
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- W2066112529 title "Ion chromatography of alkaline earth and heavy metal ions by on-column derivatization with bisazochromotropic acid" @default.
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- W2066112529 doi "https://doi.org/10.1016/0021-9673(93)83038-t" @default.
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