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Document Type

Research

Abstract

Distribution coefficients have been determined for a number of trivalent lanthanide ions on an ion exchange resin containing N-benzyliminodiacetic acid groups. At pH 2.00, μ=0.100 and 25.00°C. the relative stability trends for lanthanum through neodymium were found to be in agreement with trends previously observed with iminodiacetic acid N-methyliminodiacetic acid and N-benzyliminodiacetic acid. Beyond neodymium the distribution coefficient sequence of lanthanide-resin chelates is inverted. On the basis of the distribution coefficients, the inverted elution sequences previously reported in the literature for lanthanum and lutetium on the resin can be explained. A number of plausible explanations for the trends observed can be offered, among which are steric effects, changes in coordination number and electrostatic repulsive effects. Infrared spectral data indicate the existence of a zwitterionic lanthanide chelate species which may contribute to the latter effect.

Publication Date

1967

Journal Title

Proceedings of the Iowa Academy of Science

Volume

74

Issue

1

First Page

54

Last Page

80

Copyright

© Copyright 1967 by the Iowa Academy of Science, Inc.

Language

EN

File Format

application/pdf

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