Abstract
Several benzenepolycarboxylate salts were used as eluents for separating common inorganic anions on a highly efficient anion-exchange column. Eluents containing a — 3-charged benzenetricarboxylate (BTA) anion or a — 4 pyromellitate anion gave better separations than — 2 phthalate eluents of samples containing both — 1 and — 2 anions. Compared with phthalate, a lower concentration of BTA or pyromellitate is used in the eluent, with a consequent improvement in the sensitivity of detection by indirect spectrophotometry. With BTA and pyromellitate eluents, sulfate elutes much earlier than nitrate and other monovalent anions than it does with phthalate. However, this effect may depend partly on the type and capacity of the ion-exchange resin in addition to the eluent.
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