Abstract
2,6-Pyridinedicarboxylic acid (2,6-PDC) was investigated as an eluent for ion chromatographic (IC) separation of inorganic anions, Mg2+ and Ca2+ followed by UV and conductivity detection. Other eluents containing trimesic, pyromellitic and commonly used gluconate/borate were also studied. Eluents containing 2, 6-PDC gave reasonable resolution and detection sensitivity for all analytes of interest. The effects of eluent pH and concentration of 2,6-PDC on the retention and sensitivity were investigated systematically. The separation and detection of HCO3−, H2PO4−, Cl−, NO2−, NO3−, SO4−, Mg2+ and Ca2+ within 11 minutes were performed using 1 mM 2,6-PDC at pH 6.0. Detection limits were in the range 5–15 μM for UV detection and 1.5–4 μM for conductivity detection. The proposed method offers a quick, sensitive and simple means for the determination of common anions, Mg2+ and Ca2+ particulaly in water samples.
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