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The apparent ionization constants of the iminodiacetic acid groups of the chelating ionexchange resin Dowex A-l have been measured in 0.1 M and in 1 M sodium chloride solution. Despite the fact that the ionogenic groups are situated in a styrene-divinylbenzene copolymer matrix, the measured values are of the same magnitude as those of the simple monomeric analog, benzyliminodiacetic acid. However, the pH dependence of metal ion distribution coefficients is not predictable from the pKa values using the customary treatment applied to monomeric chelons. Experimental distribution coefficients as functions of pH are reported. From the temperature dependence of the D values, "formal" values of AH and of AS have been calculated for the exchange process.

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