A chromatographic method for determining the carboxyl groups in filter paper was developed. Experiments were carried out with several kinds of metal ions, making use of the strong bond of different metal ions to the carboxyl groups of the paper. Lead(II) ions gave the most satisfactory results. The influence of ester and lactone groups on the carboxyl group determinations was studied. The method is rapid and reliable.
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Ultée et al. (1955) studied this question.
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