Application of microcolumn ion chromatography using anion exchangers modified with dextran sulfate for the determination of alkali and alkaline-earth metal ions

Microcolumn ion chromatography using anion exchangers modified with dextran sulfate has been applied to the determination of alkali and alkaline-earth metal ions contained in guinea pig serum and bovine serum. These serums contained Na+, NH4+, K+, Mg2+ and Ca2+ and they were indirectly detected at 200 nm. The determination was done without any pretreatment procedure other than dilution.