| 摘要 |
PURPOSE:To lower the conductivity of a background resulting from a mobile phase, and to increase the degree of dissociation of an organic acid by converting perchloric acid of the mobile phase to insoluble salt by using a post column derivative converting method, and also, adjusting pH of the mobile phase. CONSTITUTION:Perchloric acid is supplied as the mobile phase from a mobile phase storage tank 2, and a sample containing an organic acid is introduced from a sample leading-in port 4, and separated by using an ion eliminating chromatography 5. Subsequently, to an obtained separation extract, a basic aqueous solution containing perchloric acid and an organic-onium ion which can form insolubility (example: tetrabutylammonium hydroxide aqueous solution) is added and mixed from a reaction reagent storage tank 8, the perchloric acid is converted to refractory salt and a background is decreased, and also, pH of the mobile phase is adjusted to 5-9, and by quickening the dissociation of the organic acid, the sensitivity is improved. Subsequently, the electric conductivity of an organic acid anion in a mixed solution is detected by an electric conductivity detector 7.
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