Abstract
A simple, selective and sensitive method was investigated for simultaneously determining anions (Cl −, NO 3 −, SO 4 2−) and cations (Na +, NH 4 +, K +, Mg 2+, Ca 2+) in acid rain and related environmental waters in central Japan. The method involves simultaneous ion-exclusion-cation-exchange chromatography with conductimetric detection on a polyacrylate weakly acidic cation-exchange resin column with a weak-acid eluent. With the weak-acid eluent (tartaric acid) both anions and cations were separated simultaneously, based on ion-exclusion and cation-exchange mechanism. Owing to the presence of H + ions in the tartaric acid eluent, the detector response was positive for the anions and negative for the cations. Using a 5 m M tartaric acid-7.5% methanol-water eluent, good simultaneous separation and detection were achieved in about 30 min. The results indicated an ionic balance of about 100% between the anions (including HCO 3 −) and the cations (including H +).
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